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Messages - maxxevv

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61
EOS Bodies / Re: Canon 18-45 f/3.5-5.6 Kit Lens for APS-C Mirrorless Patent
« on: February 20, 2012, 08:42:34 PM »

Back focus distance of 0.5mm: Assuming that the translation is correct, I assume this means flange to focal plane distance. Of 0.5mm??? The back of the lens will sit flush on the sensor in that case. Make it interchangeable, and you will guaranteed damage the sensor when changing lenses :)


They are different things. You're mixing them up.

Canon EF Mount has a flange distance of 44mm. But most of its lenses have a 'back focus' of between 35-60mm.  See the difference there ?

Get to read a few more of the patents on those new EF lenses and perhaps you'll catch the groove.

62
EOS Bodies / Re: Canon 18-45 f/3.5-5.6 Kit Lens for APS-C Mirrorless Patent
« on: February 20, 2012, 08:39:22 PM »


18mm for the NEX. Here's a list of ALL lens mounts  http://en.wikipedia.org/wiki/Lens_mount


Thanks, I've already seen the table.  It addresses the 'flange mount distance'  not the 'back focus distance' of the lens since we do not know the flange mount distance of this lens, its moot ....

63
EOS Bodies / Re: Canon 18-45 f/3.5-5.6 Kit Lens for APS-C Mirrorless Patent
« on: February 20, 2012, 11:15:08 AM »

There may be a serious physical size consideration here.  It's already APS-C.  Given what the patent shows I'm already kinda worried it will look like a half of a can of soda hanging off a deck of cards.  The whole package needs to be small or else it's pointless.

I'm not so sure what the outcome will be but I think Canon seems to have pulled all the stops in miniaturizing the lens design. Typical back focus for EF lenses are in the range of 40-70mm range. But this one apparently has a "0.5mm" back focus. Which means an extremely rear plane ! Typically, a lens with a very close rear plane can be made smaller to cover the same image circle.   

I wonder how this compares to other mirrorless systems or maybe even the Leica M system ?   Anyone has any clues what are the back focus of other mirrorless systems like the NEX  ?

64
EOS Bodies / Re: Canon 18-45 f/3.5-5.6 Kit Lens for APS-C Mirrorless Patent
« on: February 20, 2012, 10:08:41 AM »
Think the prayers of a lot of mirrorless advocates have been answered !  :D

65
EOS Bodies / Re: 5D Mark III & 5D X Specs?
« on: February 19, 2012, 08:01:27 AM »
It would seem to me that the AF module and the FPS are mixed up between the two really.

The 1Dx churns out 18Mp x 12fps = 216 Mp/s

When you reverse it on a 45MP sensor, you get 4.8fps.   

So, it doesn't make much sense to get only 4.9fps on the 5DIII if it "only" has 26.4MP.  Likewise, it doesn't make sense to put a top of the line AF on a slow FPS camera either.  When in a sense, a 19pt 7D sensor is quite suffice??

I would think, that the specs should read :

5DIII: 45MP, 19pt AF, 4.9fps, High Dynamic Range,  moderate  ISO 12.8k-25.6k. 

It would make sense as a high pixel camera for landscape, studio, product work.

5Dx : 26.4mp, 61pt AF , 8 fps High ISO 51.2k- 102.4k,

It would fit into the role of a compact, photojournalist, sub-sports, do everything camera body.

Makes more sense ???  ???

66
EOS Bodies / Re: Announcement Soon [CR3]
« on: February 18, 2012, 12:41:15 AM »
There is a chinese webby stating the supposed specs for the 5DIII that reads :

26.4MP, 19pt AF, Digic V, 4.9fps, 63 zone Metering , 1040K LCD, 100% viewfinder

http://detail.zol.com.cn/240/239857/param.shtml


67
EOS Bodies / Re: No 7D Mark II? [CR1]
« on: February 15, 2012, 07:14:21 AM »

No one says to keep the full resolution of a APS-H sensor when an EF-S lens is used. I mean when you will use a EF-s lens on a... say... 20MP APS-H sensor you will have 12-13MP effective resolution ( the camera will crop the 1.3 sensor to 1.6).

Precisely !!!

68
EOS Bodies / Re: No 7D Mark II? [CR1]
« on: February 15, 2012, 03:52:10 AM »

Again, no. the whole idea of the EF-S lens is that the rear element is *really really* close to the sensor. Just how you intend to tweak a mirror so that it becomes smaller but still covers the same area is beyond me.

Take a look at the difference between the rear mounts of an EF-S lens and EF one. Compare.

Then look at the physical dimensions of APS-H and compare to that of the APS-C (Canon). They are a lot closer in size compared to the differences between them and FF.

In any case, its just a conjuncture which I think isn't too far fetched if Canon wants a premium for its 'sub-pro' and 'super advanced' camera.  It would not alienate EF-S users and at the same time provides a premium upgrade path too. 

But who knows...  Canon may have other ideas.    :)

69
EOS Bodies / Re: No 7D Mark II? [CR1]
« on: February 15, 2012, 01:33:15 AM »

Sorry but no, EF-S lenses are designed for APS-C sensors and can not be used for larger sensors.  EF-S lenses extend further into the body therefore the larger mirror on an APS-H or FF would hit the back of the lens.  EF-S lenses also produce a smaller image circle designed to cover an APS-C sensor only.

Perhaps its not clear in what I wrote. Let me elaborate.

In-camera crop on an APS-H sensor to use an APS-C lens isn't too far of a stretch isn't it ? The mirror of the 1.3crop isn't that big compared really and with some tweaks, it may fit an EF-S lens.

There was a story / article of a guy  who did something of the sort with his 1D and mounted an EF-S lens, albeit with some minor modifications to his lens only. The height difference between an APS-C and APS-H is less than 5mm.

So, it might be possible to tweak the mirror in an APS-H camera to have sufficient clearance for an EF-S lens' rear protrusion.

Thus an APS-H camera with an APS-C crop mode by allowing it to accept EF-S lenses. Especially if the AF module was designed for APS-C in the first place.  Possible ??  ;D

70
EOS Bodies / Re: No 7D Mark II? [CR1]
« on: February 14, 2012, 10:14:32 PM »
Yes, most people still want a high density sensor for 'reach' applications. And partly also for cost.

But what if the 7D successor moved up the ladder and became a APS-H, with compatibility to EF-S lenses ? 
And kept the pixel density at about 12-16Mp instead for APS-C crop ?

Wouldn't that make for a very appealing camera if it kept all the bells and whistles of the orignal 7D and add a Digic V processor? In the process (mainly due to US$ to Yen exchange rates), price moves to about US$2200.

71
Sports / Re: Indoor cycling
« on: February 14, 2012, 09:45:09 PM »

So how do I make "guy in orange off the front" or "two teammates working together against a third guy" into a better story?  I think I've been looking at it from the cyclists perspective (capture the moment that they already have a context for) than from a spectators standpoint.


That's kinda difficult really. There are no clear guidelines as to how you're gonna do that. It takes a fair bit of luck and a keen eye to read a race and catch such things as they occur. I was lucky to catch it in my example for "MG_0607" . I ride bicycles ( specifically roadbikes )myself for the past 18 years or so and would assess where and when such breaks might occur on the course. And would move to such areas to catch such shots IF possible. Usually, its easier to catch the emotion and facial expression on the riders faces with some of the action and form a story from it.

Same race different year, different conditions. Managed to catch the emotions of the two riders :

http://i235.photobucket.com/albums/ee89/KangSw/OCBC%20Cycle%20Feb%2009/IMG_0688.jpg

This is one key aspect of sports photography that's really hard to catch. And also why top sports photographers are highly regarded professionals. It takes a fair bit of luck too as in my examples above.  :P

Actually I think shot #2 was at 1/30, but I don't have the exif in front of me.  The problem was there wasn't enough environment to give any motion blur at high shutter speeds.  A solid blue wall just doesn't really blur much.   ;)


Oh, don't get me wrong, not saying you're can't do really slow pans. Just suggesting that you need to adjust your panning to the needs of your environment. Its possible to shoot as low as 1/30 but its rather impossible to do a good panning follow-through if you do not have sufficient space to move around and prime the AF.

On the other hand .. panning isn't just about the motion blur, nor about getting as much of a blur background either. Its about achieving the 'sensation' of motion while yet being able to give your subject the requisite attention it deserves. In this case, the overall effect is actually quite good but would be better if at least the rider's face was clear and sharp. It would have worked just as well if it was something like 1/50 or 1/60 and you got more of the rider in sharp focus.

And as cited previously, compression of images can be quite a pain for such shots sometimes. So you're good. Just don't be too obsessed about 'getting the background as blur as possible' ... it doesn't work that way.

Here's what I did with a really close up, 5~6 feet away, the riders were going pass me at about 40km/h, was a 1/125 shot.



Here's 'Tinker' Juarez with the setting sun in the background and dim, dim evening light. Flash was used for fill and this was shot using an ultrawide 12-24mm on the 5DII. ISO was 1600, at 1/125 shutter. Just to illustrate the 'slight flash fill' ...

[url=http://i235.photobucket.com/albums/ee89/KangSw/Tinker%20Juarez/Tinker-Sunset-background.jpg?t=1242795211]http://i235.photobucket.com/albums/ee89/KangSw/Tinker%20Juarez/Tinker-Sunset-background.jpg?t=1242795211[/url]


Beautiful!
[/quote]

Thanks. Glad you like it.   :)
I waited about an hour for Tinker to come by for 2 rounds at the same spot as I was anticipating the sunset. There were maybe 5 or 6 shots taken over 2 passes and this was the best that came out of it.

72
EOS Bodies / Re: 5D Mark III/X Information [CR1]
« on: February 14, 2012, 09:56:13 AM »
The first reports says that 1DX and D800 will have about the same high ISO performance, D800 is better than D700/D3 and 5Dmk2 att all ISO:s and that D4 is about 0.5 stop better than D800 and 1Dx.

Guess we will have to wait for final confirmation but it's sounds likely.
If this is correct then one might wonder what Canon will do with 5D3 to compete. Perhaps it will beat the 1Dx by 0.5 stop at high ISO?

Interesting ...  gotta a link ? Would certainly like to have a read..   :)

73
EOS Bodies / Re: No 7D Mark II? [CR1]
« on: February 14, 2012, 09:32:19 AM »
Just a thought ... what if the 7D successor was an APS-H camera that they somehow made it compatible with EF-S lenses ?   :P

And they grafted the AF from the 1Div, with some '7D-ish' wrappings' rather than offering the latest and greatest from the 1Dx?  It would create an awesome camera, with a clear upgrade path for the APS-C users as well a clear market segment ? 

It might be so rather than completely killing off the 7D since it has been such a great seller.

Think about it :

- APS-H with 20+/- MP (possibly recycle the 1D-IV sensor)
- EF-S lens compatible ( Some modification to the standard APS-H sized mirror could possibly allow that )
- 7-8fps
- ISO up to 12800
- 1D-IV AF with additional 7D implementions (zoning ??), but simplified somewhat compared to 1D-IV
- No f/8 AF points
- Carrying all the bells and whistles of the 7D
- Separate grip
- Single Card
- Weather sealed
- $3200-$3800

I think it would sell in heaps !   8)

Possible ???

74
Sports / Re: Indoor cycling
« on: February 13, 2012, 03:20:11 AM »
The 'context' meaning that the picture must be able to tell a story ... like what aspect of the race are you depicting here ? Someone trying to breakaway, someone struggling ? Someone having a strong race ? Or just the pure pace of the event ?

Panning in sports is more often than not under-estimated by most people. It takes a pretty fair level of skill to snap good panning shots. In my example "_MG_0570.jpg" was shot at 1/160, on a slow lens. Would suggest using what's available for lighting and tweak your shooting to it. I've shot as low as 1/50 but only if I have the space to move freely.

Note though, learn the idiosyncrasies of your camera's AF. I used to own the 40D and now I shoot with the 5DII. (the shot examples were on a 5DII). They both behave somewhat differently given similar situations and same lenses used. I find its easier to shoot in manual at night as lighting is never even, and can result in erratic exposure readings.  But.. do that if you know what you're doing. Else, AV, TV is preferred by most.

If you can't get high shutter speeds, do more panning. Do more head-on shots.  Get up close. 

If you must use flash, please don't flash into their faces/eyes. A side fill flash from a distance is perfectly fine though. As its hazardous in tight criterium races for cyclists if they even lose concentration for a split second from a head-on flash.

Here's 'Tinker' Juarez with the setting sun in the background and dim, dim evening light. Flash was used for fill and this was shot using an ultrawide 12-24mm on the 5DII. ISO was 1600, at 1/125 shutter. Just to illustrate the 'slight flash fill' ...

http://i235.photobucket.com/albums/ee89/KangSw/Tinker%20Juarez/Tinker-Sunset-background.jpg?t=1242795211


75
Sports / Re: Indoor cycling
« on: February 13, 2012, 01:21:37 AM »
For #3, you could try to get closer the next time to get the facial expression. Note sure if its the compression ( it often happens ), but the picture seems a little out of focus ??

Sports in general is not very effectively conveyed from a distance unless there is a 'context' to what you want to portray.  This applies to pict #1.

For pict #2, you could try to increase the shutter a wee bit more so as to at least get the face into sharp focus.  Extreme low shutter speeds do not work if your panning cannot keep up with the subject. Again, not sure if the compression in the image affected the sharpness though ??

Hope the comments will be constructive for you.  ;)

An example:

http://i235.photobucket.com/albums/ee89/KangSw/OCBC%20Cycle%202010/_MG_0570.jpg

http://i235.photobucket.com/albums/ee89/KangSw/OCBC%20Cycle%202010/_MG_0170.jpg

http://i235.photobucket.com/albums/ee89/KangSw/OCBC%20Cycle%202010/_MG_0607.jpg


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