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Messages - John Thomas

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EOS Bodies / Re: LR4.1 RC to blame. Check this out!
« on: May 02, 2012, 02:38:46 AM »
Same very good results with Corel AfterShot Pro which supports 5DMk3.

Raised the shadows till the max - no problem with shots at ISO 100 shoot in sun (contre-jour). Ok, for nit-pickers there is very very very low noise. And this without any other Noise Reduction/Post Processing adjustment.

But if one use one (or more) NR/PP engines from AfterShot the results are (almost) perfect - especially using Noise Ninja Lite and Perfectly Clear (both embedded in AfterShot).

Taking in account that it is a very good, very fast, mature and relatively cheap program (in fact it is the old Bibble 5 which Corel purchased) I'd recommend it over LR.


a TB every month (with backup) is not exacty cheap..... but compared to the film day...  well yes.

To be sincere: I do not shoot with the same frequency all day/month/year long. It depends on event(s). Till 5DMk3 I had 2 disks (one for backup) x 2TB covering ~ 1.5 years.


just a side note.
10000 pictures in two weeks that would be around 740GB with the D800 and around 280GB with the 5D MK3.. right?

RAW images of course.

do you delete a lot or are you one of the shooters who stores all images?

No, usually I do not delete. But don't take it as a dogma. The thing is that I must be very careful what I delete because my photos enough times happened to be valuable because of other factors besides the artistic / main subject. For example a rare architecture detail from a byzantine building which got demolished, a VIP which was preset somewhere where nobody else expected etc.

And the funny thing is that in enough cases neither I was aware of these things. After a while due of some circumstances etc. I discovered these things.

Hence, I delete sparingly photos because you never know what you delete. And also, the storage / GB today is so cheap that isn't worth the time to do it. But of course, if I have some big series of bad photos (IOW I'm effective in making space) I delete them. Imho, it needs discrimination.



I was going to buy a 5DIII as a replacement for my 1Ds3 - but I have now spent the money on a lens :D

Perhaps you can find an undocumented feature on the 5DIII that gives you manual mode plus exposure compensation then??

...and if I found something what would you give me???  :P  :P  :P

There is one.  ;) ...sort of.

Of course is too bad that we don't have EC. Also, I think that this feature is also a must have for a firmware update.

However if you want EC in M mode just in order to protect your highlights, you can enable the Highlight Tone Priority feature. It does its job with noticeable results. Just checked by shooting two shoots of the same frame with half wall half open window (the camera sat on my desk). One with HTP enabled and one without. The exposure values (including the Auto ISO where the same) but the differences in the highlights are quite noticeable.



A few more thoughts...

I think you can do what you want and probably get great pictures if you take advantage of the features you've got. Between the safety shift feature thats there, the control over ISO and min shutter you have, and the programmable custom modes, there's not a situation you can't cover.  Don't be afraid to turn the mode dial once in a while :)

Sure. I can do it. But...
Everything boils down to the available time. Did you shoot a fast-paced changing-light event? For ex. a rock concert? circus? (some) sports? (some) parties / weddings? Some news event (a riot, strike, a personality)? etc.

I don't know others but I loose too many shots by trying to change/adjust the settings. It is the same problem with the one between Manual Focus and Auto Focus. Time. Having the Live View and the magnification there, the Manual Focus can be (and usually is) much more precise than the Auto Focus. And also, you can focus exactly where you want (no 61 AF points, no light limitations, no nothing). Also the mechanical (MF) lenses are usually optically superior to the AF ones (see Zeiss glass).

So, with these cameras, MF has plenty of advantages against AF. If you can afford it. If you have time.

Now, since the new Exmor sensor is regarded as superior, Canon must bet on better photos from a better camera, not from a better sensor. And the only thing which they can improve now effectively is the firmware. And it has also the greatest ROI.

Also, if you look at my examples is not only a shortcut for turning the dial. It is much more: Auto ISO range, Auto ISO Min shutter speed aso. Even if I have them in "My Menu" I must remember to change them and draw out my attention from the flow of events. And when I manage to change them perhaps they are already obsolete.

Speaking of mode dial... I'm surprised you shoot in P mode most of the time. Why?  While I'm in no position to judge, I would encourage you to take more control over your photography...  For example, I dont know a serious photographer that doesnt care about depth of field, and shooting almost exclusively in P mode says you dont care.  It's very unusual.   I can't imagine shooting anything but a test shot in P mode myself.  While the 5D is a capable point and shoot, you're not getting the most out of it in P mode and as you probably know, wishing for more/different automation is not necessarily the best path to better photos.

Thanks for your counsel. :-) Very well regarded. Also, I try to take control over the photo/ DOF / exposure, when I can. But I have the problem of ever-changing lighting conditions and the problem of time (see above). Otherwise other cameras (including D800 :D) could be a better alternative. Otherwise the new super-AF system isn't sustained by an on-par exposure engine. Just imho, of course.

my 0.02c & HTH,

John Th.


Guys, this a GREAT camera! The best event camera which I ever seen (or it could be) - my IMHO of course. I saw, Canon 350D, EOS 1Ds Mk II, 1Ds Mk III, 1D Mk IV,  60D, 5D, 5D Mk II, Nikon D70, D5000, D3s, D700, D7000 and some Sony Alphas (the last one A-500).

The 1D4 has a feature that fixes your issue #2

It effectively gives you manual control of shutter speed and aperture with auto iso plus exposure compensation

To me that is a major hurdle along with the non AF point metering that stops it being top for sports events

Re. 1D4 to 5DMkIII: Well, sometimes I'm thinking that the mankind didn't came from apes but are heading to them. 8)

...but you know: Even if it is UNDOCUMENTED, 5DMk3 does have AF point metering.   :P

Try the following experiment:

1. Put your camera in Evaluative Metering Mode

2. Set the camera in Single AF Point Mode (if isn't already)

3. Choose a scene with big differences in light areas. For example I aim the camera to my office (or a table, it is similar) with the lamp in the ceiling open and having the edge of the office / table in the middle of the viewfinder. Perhaps a portrait orientation of the camera would help. Anyway, the net result is that you have a very bright zone (the top of the table / office) and a very dark zone (the space which is under the table - if you catch also your dark pants in the frame so far so good. We need to be dark in there).

4. Move the AF point to the bright zone and press AF-ON to start metering. What gives it to you? :) Mine says 40Tv, F/3.5, 800 ISO (my AF point is on my white keyboard from which I write this).

5. Now move the AF point to the dark zone (take care to not move camera in order to change the global amount the light from the frame) and press AF-ON to start metering. What it says now? :) Mine says 40Tv, F/3.5, 3200 ISO (my AF point is somewhere on the dark floor).

Voila!  :D

On Evaluative Metering the AF point is "somewhat" linked with the metering. I also shoot some samples: in the shoot from the step 4 the keyboard looks pretty ok while underneath is a dark, murky area. In the shoot from the step 5 the keyboard is almost burned while on the floor I clearly see the network cables and the texture there.


PS: I leave as homework for you to experiment the other metering modes and report back. :)

Some of my own thoughts...

#1... Good idea... What happens when the counter gets to zero and there is still room left on the card?  Does it say card full or can you continue shooting until the card is actually full?  And just a note... The counter will report the lesser of the shots remaining on the CF or SD card... So beware of this if shooting different image types/sizes to the two different cards. It's not clear which card is the limiting one, so another suggestion is to put an indicator or offer a firmware option to select which card to monitor. 

#2. This option is  designed for shooting in AV mode in low light  - and is a welcome addition - just the way it is (but having more shutter speed choices wouldn't hurt). If you need strict enforcement of shutter speed you should be using Tv or Manual.  Also, attempting to set a shutter speed of approx. 1/focal is the default camera exposure programming in Av... We don't need a firmware option for it.

#3. Strange. I don't use wrap around, but I could see how this is annoying if you do.

#4. I don't find this to be an issue, but why not?  I only use the 41 cross points which helps reduce the number of joystick operations required to move the AF point from one side to the other.

#1 - I have the camera set on "Auto Switch Card' and the screen shows the shoots left on the current card. I don't have time to look at the counter when the things go wild but I think / it seems that there is no negative number - the counter "improves" itself when it gets close to the limit. Most probably the algorithm is CounterNo = FreeSpace / FixedFileSize. The problem is that the FixedFileSize constant is a.) way off and b.) is not a constant, it is a variable (the cr2 & jpegs have compression). That's why a much better estimation is something based on global average (ie. TotalSizeShoot/TotalFilesShoot - and this number to be kept for each resolution / ISO) or much better on a moving average (the above number calculated only on the last 50-100 files).

- Hello brother!  ;D A typical programmer response. ("This is not a bug, it is a feature") Sorry, but I don't think that 'broken by design' is a solution. :) See, we don't want to enforce a certain FIXED shutter speed. If I have a zoom, let's say 70-200 F/2.8, I simply cannot use Tv to set the shutter speed to... what? 1/200?? It is way to high in ever-changing light conditions. Remember we're talking here about an event handheld camera not a studio one. Yes, I know, IS. But I cannot think to Image Stabilization as a kludge for firmware shortcomings.

Another usage case: I have an UWA on the camera - let's say Tokina 16-28 F/2.8. Where to set the FIXED shutter speed? Based on common knowledge (and my tests confirm that) the lens deliver ultra sharp images even at Tv 1/16 handheld. But I cannot set it there because my subjects (men) are moving and hence, if the light permits, I want to have the shutter speed raised automatically and when they'll go again in the dark to lower the speed.

I use the Av mode but there is the same problem: the "approx" gives the blur of the image. We don't want the "approx" because this can be sometimes very "approximative". We need (imho) 'equal-or-greater'. And mind you, I found this issue by looking at blurred photos, not by nitpicking EXIFs.

Also, even if Av it would work I think that P mode is superior because it tries to get out the camera/exposure from the "dangerous zones" (slow shutter speeds AND open apertures) leaving you to concentrate on what to shoot / composition etc.

Because of all the above reasons, I humbly think that we need a firmware fix for it. Especially because it seems that it is a simple fix (they should change the test from something like "nearest value" to "equal and bigger ( >= )" if an option is set).

- Thanks to validating me, but in fact it seems that you responded here at #5 :D . The #4 is a very powerful feature which would provide multistage fallback exposure programs. Let me give you an example based on what I said above:

Reiterating the UWA case: In studio, the above lens (Tokina 16-28 F/2.8 ) deliver sharp images at 1/F and it has the best quality aperture @3.5-8. However in the battlefield, having a 1/16 speed usually produces blurry hands, legs etc. but even so you can catch a very expressive shot.

So, roughly speaking, I would have like this:

  • Camera main settings: Av mode with F/4 - Auto ISO 100 - 6400, Min Shutter Speed: 1/60 (this is the best-case scenario which will cover 75% from cases)
  • C1: P mode - Auto ISO 100 - 12800, Min Shutter Speed: 1/60 (here I still try to freeze the men)
  • C2: P mode - Auto ISO 100 - 12800, Min Shutter Speed: Auto (the worst-case scenario: catch what you can)

...and in Super Safety Shift I would have set "C1,C2" - so if the camera cannot obtain the correct exposure with the main settings then it will try the C1 and after that the C2.

I hope that is clearer now,

J. Th.


Also, no comments on your post regarding image quality, sharpness of your 10,000 shots.  any thoughts there?

Guys, this a GREAT camera! The best event camera which I ever seen (or it could be) - my IMHO of course. I saw, Canon 350D, EOS 1Ds Mk II, 1Ds Mk III, 1D Mk IV,  60D, 5D, 5D Mk II, Nikon D70, D5000, D3s, D700, D7000 and some Sony Alphas (the last one A-500).

I humbly think that I'm not very biased. The hurdles from my OP, the enthusiasm around D800 which in part I understand and the "softness" of my first photos (more on this later) keeps me more or less with the feet on the ground.

The first problem with my first shoots were the "softness" of the first photos. One of the main causes was/is the lack of AF MicroAdjustment. It seems that some lens needed it. Another cause is the new AF subsystem which is a gorgeous type of work but one needs to learn how to use it. Another thing is the problem from the point 2 in my OP (the shutter speed is slower than the lens' focal distance).

Another thing is that it seems that Canon did many things for Noise Reduction sometimes sacrificing detail. That's why, from my experience, shoot in RAW and stop around 12800 ISO. ISO 25600 is definitely workable and useful but personally I won't let the camera to go by itself there. Nobody should have problems with ISO till 1600 or even 3200 in real world situations. (Guys shooting with lens caps on is not a real world situation).

A game changer is the new metering engine. The photos look sometimes darker and sometimes do not "pop" so much. But there is enough headroom in the histogram to work with. Also you must learn from experience what really means "Evaluative Metering" now.

AF system. This alone should account for an upgrade. But you must learn it. The full-automatic AF in which camera chooses can be dangerous sometimes (can be somewhat slow, or to choose another AF point that you don't want) but it is better than in past iterations. The other modes are much better. Also, this is IMHO the first reliable AI Servo which I use. It can catch the priest clothes when he moves incensing in the low light of a church. Very impressive. But you must learn a little how to do it. Isn't very hard but you need to exercise it. Also, wery good thing about the AF system is that it is/it can be linked to the camera's orientation. So you have 2 settings for the AF engine.

(Near) Silent shooting. A must have. Only from experience one can say what a big difference is to be unnoticed being at several meters from your subject and immortalizing him as he really is.

Another good surprise is battery life: @ 2000 shots. The manual says 950. I cannot explain why. Perhaps because I turned off the Auto Review (but I do manually review the photos from time to time) and the Focus Confirmation Beep.

DR: Very Good for me. I need better high ISO. Yes, I would like to have the D800's DR but NOT sacrificing the high ISO performance. It is more important for me the ability to have high fps which are focused and with reasonable noise in low light.

WB: Very very good. And I'm speaking about very difficult lightning: candles, tungsten, incandescent, small lamps, smoke from fire, candles, censer etc. - a whole mix of them. The camera is/was always on AWB. Leave it as is.

HDR & Multiple Exposure mode: I've played a little with HDR. Technically good thing, useful, if you don't have moving things in your photo but I'm thinking now that too much DR makes your photos too unnatural. Ok, sometimes it works but not in too many cases. IMHO.

Ergonomics: Hallelujah! Very very good. Many things go natural, even if you need to customize the camera. It seems that the Canon was quite prudent in some areas. Sometimes more than it should and this drags you down. See the points 3 and 5 from my OP.

Generally speaking I'm pleased with the purchase - looking at D800 samples I don't think that it would serve me better. Ok, I would like to have less noise at high ISO but this is tech now. IMHO there is an exaggerated pixel-peeping nowadays around these cameras. Go and shoot. It will help you.

PS: What I would expect from Canon is to be next to us and improve the things in order to show that they do care. It can be a game changer for them.

After a thousand photographs, this it?  Canon misrepresented the number of photographs a card can hold--they underestimated, and a few other minor issues.  Were the photographs any good?  Did they please you?  Or doesn't that matter?

Sorry to pick on you, but the same question could be asked of many of the posters to this website.  I was dissatisfied with my first batch of photographs.  They didn't pop, so to speak.  In reviewing them, I realized I should have filled with flash.  Then they would have been great.  My fault.  Not back focusing, or front focusing, or lack of sharpness, or this sensor, or what some stupid DXO test said, or whether my "glass" was an L or image stabilized or a third party's.  You folks need to comment on the photographer a lot more and on the camera a lot less.

Before jumping on my opinions about photo quality, IMHO some of them (especially 2 and 4) are not minor issues. Again, IMHO. When one is an event photographer and everything is changing quickly around him it is critical to get the job done by keeping the pace with minimal fuss and having your mind focused on what you have to do and not on how to do it or how to overcome some firmware limitations.

Also, being programmer from approx. 20 years, including low-level programming, I would dare to say that I have a bare knowledge on what could be accomplished via firmware. IMHO, it is very important to have in difficult situations a "Plan B" for exposures. Consider this: With an UWA lens raked at 16mm the "Auto" ISO means 1/16 which is much to slow to catch a ton of human movements ranging from sports to the priest incensing the crowd. Hence you will set the Minimum Shutter Speed at (let's say) 1/60 or even faster: 1/100, 1/250 and more (if we'll have the possibility). But suddenly our subject (the footballer, the priest, the athlete etc.) enters in a dark area and the camera hits the max ISO. Believe me, you simply cannot dig in the menus to change that in the time you have at disposition. The camera should do a Safety Shift (see the point 4 in my OP) because even with 1/16 you can get a good shoot if you're lucky enough. But of course, it is a drama to have 1/16 as the only option.

Another case: We know that there are enough lenses which their quality decreases at wide open apertures. For ex. for 50mm F/1.8 lens the best aperture is somewhere @ 2.2. For F/2.8 lenses is @F/4 etc. So, we'll have in the main program set the Av at the max quality aperture and in the fallback program / safety shift program have the worst-case-scenario: allow the wide-open aperture, highest ISO etc. When the event you need to photograph is rolling you even don't have the time to think about the fact that the camera needs new adjustments. Especially if it's an event of unknown nature for you.

I'm not upset that you're "picking on me"  :) , but I want to make the things clear. Also, speaking about image quality will bring small value for me, Canon and for the community as a whole. But a firmware improvement (especially now when they have these problems) will make a difference.

The next post will be about my human impressions (quality etc.). I promise.  :)

my0.02c++ & HTH,

John Th.

Trying to respond to all of you, starting chronologically. The first one was this:

on item 2, did you try shooting auto ISO in manual mode?  You can also set the minimum shutter speed when in auto iso and aperture mode, did you find the same problem there?  For example even with your 50mm, you could set min speed to 1/200 in aperture mode!

I did not have any issue when i tried it for the auto iso portion.

Also, no comments on your post regarding image quality, sharpness of your 10,000 shots.  any thoughts there?

About the item 2:

My camera has the following ISO speed settings:
  • ISO speed: Auto
    ISO speed range: 50-25600
    Auto ISO range: 100-12800
    Min.shutter spd.: Auto

Also, my camera is set up to underexpose with 1/3 stop. Ie Exposure Compensation is -1/3 EV.

With the above settings some EXIF examples from my photos (only relevant info included):

  • Shooting Mode: Program AE
    Focal Length: 50mm
    Tv: 1/40
    Av: 1.8
    ISO Speed: 1600
    Auto ISO Speed: ON
    Exposure Compensation: 0


  • Shooting Mode: Program AE
    Focal Length: 85mm
    Tv: 1/80
    Av: 5.6
    ISO Speed: 4000
    Auto ISO Speed: ON
    Exposure Compensation: 0


  • Shooting Mode: Program AE
    Focal Length: 135mm
    Tv: 1/125
    Av: 5.6
    ISO Speed: 125
    Auto ISO Speed: ON
    Exposure Compensation: -1/3


As you see I'm far for reaching the maximum Auto ISO set in my camera.

No, I don't use the manual mode. I use P and in rare occasions Av mode. I use also Tv mode but isn't relevant to our discussion.

Regarding setting the lowest shutter speed: I did some tests, it seems to work ok, but don't quote me on that. Also swampler is right: personally I don't need it badly but I think that the Auto ISO should have faster shutter speeds in the menu.

Re. to image quality I'll prepare another post. Hold on.


J. Th.

Hi all,

Ok, I know that I’m quite crazy these days actually shooting with 5D Mk3. Perhaps I should discuss over and over again about DxO, D800, pixel-peeping etc. Yes, D800 is the elephant in the room and now it is obvious that the only thing which is left to improve the situation is to improve the firmware. Anyway, Canon is working on a new version, isn’t it? :-)

But since there were many more or less good opinions and tests done without being very much in the battlefield with the camera, I chose to lay down my impression AFTER actually using it in rather harsh conditions for a photo reporter – I was in the Holy Mount Athos with the occasion of the Holy Week and the Orthodox Easter and all the celebrations tied with these events.

In technical terms, this means a very broad range of light from the normal daylight till the light of a single candle (yep, I have enough keepers at 25k ISO), a very broad range of movement from fast-paced moments to an endless peace and serenity (very good to find the God, very bad for a moving photographer with a “clack” dSLR). As an aside: IMHO the silent mode of 5DMk3 is definitely a must-have for almost any photo reporter - everyone loses his natural way of being when hears the mirror's sound.

Disclaimer: The thoughts and opinions bellow are just thoughts of a photographer from the battlefield which shoot almost 10000 (ten thousand) photos in two weeks – nothing absolute, nothing dogmatic. I know that Canon is preparing a new firmware and I just want to be constructive.

Canon has a big problem now with D800 PR wise and I think that in the situation at hand the most effective way to improve it now is to improve the firmware.

Here we go:

1.   5D Mk3 screen: 418 Images on 16 GB card. Really?

Guys IMHO Canon is way off on this one. My workhorses are two 16 GB cards (one Lexar CF and one Trancend SD). EOS 5D3 says that I can shoot only 418 photos in RAW. However the camera writes on the cards somewhere between 530 – 570 files while shooting RAW mainly in 3200 – 12800 ISO range. And if I shoot in daylight (ie. low ISO) a 16GB card can hold till 590 RAW files.
Proposed solution: There are several variants but I think that the best ones are based on the (moving) average of file sizes actually shoot by the photographer. More details on request.

2.   What means “Auto” Min. Shutter Speed on ISO Speed Settings?

Well, I thought that it means that the camera adjusts the ISO and the aperture in order to meet a Shutter Speed equal with the lens’ Focal Length. But it seems that isn’t always the case, and hence there are shoots which are blurred because of this. For ex. having a 50mm lens the camera sets the exposure at 1/40 secs, having lens raked out at 135mm gives us a shutter speed of 1/122 aso. More examples on request.
Proposed solution: Add an option in “ISO Speed Settings” called ‘Enforce Shutter Speed > F. Length’ which when it is set to ‘Enabled’ will ensure (at the cost of a higher ISO) the right shutter speed (iow bigger than the F. Length).

3.   Manual AF Pt. Selec. Pattern - …half job

The “Manual AF Point Selection Pattern” (AF5 in camera’s menu) if it is in “Continuous” mode it wraps at the opposite edge. Except if the AF engine is in Zone AF mode. Why? The behavior of this feature isn’t consistent. And it is too bad. One must remember this when the things are happening quickly in front of him. Very frustrating.

4.   Super Safety Shift (Fix This!)

Guys, Safety Shift is a nice idea. However I think that it can be dramatically improved. Besides the values already there you can add other 3 values: “C1”, “C1,C2”, “C1,C2,C3” which will work in P, Tv and Av modes. “C1” means that when a correct exposure cannot be obtained with the current settings the camera will switch automatically and temporarily (only for the current shot) to the “C1” custom shooting mode. “C1,C2” means the same as above but if C1 fails also, the camera will try the C2 shooting mode. “C1,C2,C3” means that in order to obtain the correct exposure camera will try all the custom shooting modes in the specified order. Of course, beware of infinite recursion because Safety Shift is also recorded in custom shooting modes. Or perhaps is better to introduce an entirely new menu called “Fallback Shooting Modes” or similar?

5.   Not-So-Direct AF Selection with the Joystick

There is a customization called “AF point direct selection” which, during metering, allows the user to choose the AF point with the joystick. Nice feature indeed. But in order to be perfect, I think that it should have an option called “Auto-repeat” with the possible values of “Enabled / Disabled”. In order to change the AF point we must press one for each change. It would be much more convenient to keep the joystick pressed in order to move more quickly the AF point.

HTH & Best regards,


PS: Does someone know how to forward this text to Canon in order to be really effective and see some firmware improvements based on this?

EOS Bodies - For Stills / Re: 5D Mark III Silent Shutter Mode Problems
« on: April 19, 2012, 02:43:01 AM »
Shot already 1000s of photos in silent mode. No problem here.

EOS Bodies / Re: So frustrated with new 5DmkIII - returning it!
« on: March 26, 2012, 03:22:19 AM »
Since it seems that DPP and Adobe gear has problems perhaps you can try IrfanView -

It works ok for me for any RAW (including Canon 5D Mark III) - viewing, converting etc. Ok, the GUI is a little hackeradic, but it works very fast and smooth till other solutions arrive. Also, you can test for sure if the problem if with camera or somewhere else.


Lenses / Re: Best third-party lenses
« on: March 24, 2012, 01:00:34 PM »
Tokina AT-X PRO FX 16-28mm F/2.8

A very good UWA for FF sensors. Very sharp. Top notch image quality, much better than Canon 17-40 F/4 L. Tokina is better at F/2.8 compared with Canon at F/4. The price is very affordable - cheaper than Canon 17-40 and approx. one 3rd from Canon 16-36 F/2.8 L. The focus is very very quick and accurate. The build quality is impressive.

Drawbacks are:
- heavy
- (normally) doesn't take filters, but one can put Lee's filters on it.

Generally, I'm very pleased with this lens.

Lenses / Canon 1DX: The AF problem may be bigger that we think?
« on: November 05, 2011, 11:56:25 AM »
Hi all,

Seeking the lens market AND the related info WRT Canon 1D X, I found some things which seems concerning:

1st, a note from Canon's Chuck Westerfall (it was quoted also here in some threads) saying:

“AF is unavailable on the EOS-1D X if the maximum aperture reported to the camera through the electronic lens mount is smaller than f/5.6. This is a lower specification than previous EOS-1 series DSLRs. [...]"

Having in mind the above, this means that Canon 1D X cannot focus on the longer (telephoto) lenses which have an aperture smaller than f/5.6, say 6.3?

This includes (at least) the following lenses:

From Sigma:

50-500mm F4-6.3 EX DG HSM
150-500mm F5-6.3 APO DG OS HSM
50-500mm F4.5-6.3 APO DG OS HSM
28-300mm F3.5-6.3 DG Macro

From Tamron:

28-300mm VC F/3.5-6.3 XR Di VC LD Aspherical [IF] MACRO
28-300mm VC F/3.5-6.3 XR Di LD Aspherical [IF] MACRO
SP 200-500mm F/5-6.3 Di LD [IF], by buying Canon 1D X and having at least one of the above lenses and raking out the glass, one cannot use the AF anymore?

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