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Messages - Meh

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Lenses / Re: Buying a 5d mark ii what should my first L lens should I buy?
« on: November 03, 2011, 03:36:46 PM »
Without knowing what you plan to shoot with it, it's hard to make a recommendation, but the 24-105/4L kit is a great deal.

If you look at the SUBJECT line the question is answered

I read bvukich's comment to mean what type of photography/subjects the poster plans to shoot, not which body as indicated in the SUBJECT line.

EOS Bodies / Re: Max CF Card size that can be used in the 5D2?
« on: November 03, 2011, 12:32:43 PM »
This morning, that additional discount seems to be gone - cart price is the same as browsing price.  Fortunately, I got my pair of 32 GB 90 MB/s cards last night.  :D

Yep, on Tuesday evening when the sale started the browsing price for the Extreme Pro 32Gb was shown as $99.99 and no additional discount in the cart.  I also ordered two of them along with some other goodies... the shipping fees to Canada are not much more for many items compared to one so on that basis I can justify to myself adding more items to my cart :)

EOS Bodies / Re: Max CF Card size that can be used in the 5D2?
« on: November 03, 2011, 12:26:16 PM »
Many good points and all correct relative to specific circumstances.  If price doesn't matter, it's good to have the faster cards for those situations when it will make a difference.   Shooting at high fps is primarily dependent on the speed and size of the buffer.   However, on my 7D, I get an extra 3-5 frames before the buffer fills using 400x cards compared to 200x cards.  The reason is that in the time that has passed before the buffer is filled more images have been emptied from the buffer onto the CF card.   And once full and I stop shooting, the buffer does empty much faster. 

Using 600x cards is not as big a difference compared to 400x cards.... it's only 1 maybe 2 extra frames before the buffer fills compared to 400x cards.  In fact, there may not even be any difference and when I think it's an extra frame the file sizes were a little smaller in that sequence.

Biggest difference is in read speed copying files off the card to the computer.  400x cards are twice as fast as 200x cards.  600x cards are not faster than 400x if using a USB2.0 reader because USB2.0 is limited to 60Mb/s (480bits/s).

Nothing scientific about any of the above as I didn't try to do any controlled tests.

EOS Bodies / Re: Does a Digital camera need SLR?
« on: November 02, 2011, 11:17:21 PM »
10 FPS cameras like the 1D series predict where the subject will be for the next frame and focus there, and do not AF each frame at 10FPS. 

Sorry had to delete and edit the reply I just made if anyone started reading that:  Yes, in "one shot" mode the AF locks and then the camera will fire away without refocusing between frames.

You're referring to predictive AF and that is what my comments are relative to.  With predictive AF, the camera will fire away at whatever the frame rate is and will take an AF reading between every frame and adjust focus between frames.   And you're right, it also measures the speed of the subject and predicts where the subject will be in about 60 milliseconds (or whatever the shutter lag for the camera is) in the future when the exposure will be taken and focus there rather than focus where the subject is at that moment.  Between each frame AF measurements are made, a focus position is predicted, and the focus element is moved to that position.  It's essentially the same process whether in one-shot or predictive mode the difference being whether it focuses where the subject is now or where it will be 60 ms later.  And in predictive AF mode, if it can do that between frames then it is doing it in less than 0.1s (for a 10fps camera).

Mirrorless cameras do something similar.  The new Nikon may improve on this with much faster focusing.  The previous mirrorless cameras are hampered by a lack of computing power, but the new Nikon seems to have plenty of it.  Sony also has upped the stakes with their latest mirrorless cameras, but there are still lots of problems to solve before they get to professional levels, and the viewfinder is one of the biggest.

Depends which mirrorless cameras you are referring to.  My comments were referring to the differences between contrast AF and phase-detect AF.  The new Nikons V1 and J1 (if that's what you're referring to) claim to have a hybrid AF that uses contrast and phase-detect and I'm not sure how they implemented it.  The Fuji camera I mentioned has phase-detect built into the image sensor but it is slower (0.158s) and masks off some photosites so technically that affects the image and has some other issues I believe.

The Sony SLT (if that's what you're referring to) are not true mirrorless... they just use a translucent prism in place of the mirror that doesn't flip.  It stays in place and splits the light up so that 70% goes to the image sensor and 30% to the EVF and AF sensors.  The downside to this system is of course that you lose 30% of the light (about a half stop) from the image and also that the image may be slightly degraded (not much though) because the light used for the image must pass through that translucent mirror.  In a flipping mirror camera, when the mirror flips up 100% of the light is used for the image and does not pass through an additional optical elements.

Feel free to correct anything I'm not getting quite right.

EOS Bodies / Re: 5Diii vs 7Dii (FF vs APS-C)
« on: November 02, 2011, 04:09:57 PM »

I'm no neuro but I can take a shot to rephrase it into less technical terms....  we'll see if I have this right!

Perfect response Meh .... really dumbed down for me!   ;)

You get a gold star!


EOS Bodies / Re: 5Diii vs 7Dii (FF vs APS-C)
« on: November 02, 2011, 04:09:15 PM »
But in a real-world application, DoF is shallower with FF (because you have to move further from the subject to compensate for the narrower angle of view with a crop sensor).

I like the way you phrased "real-world application"...  unless something is preventing the photographer from moving, he/she will move forward or back to compose the shot and to get the desired framing one would naturally (without thinking about the technical aspects) move a little further away with a crop sensor camera according to what is seen in the viewfinder.  And because we don't walk around with DoF calculators we might tend to choose the same aperture setting and when we look at the images we do in fact observe that the FF gave more background blur.

EOS Bodies / Re: 5Diii vs 7Dii (FF vs APS-C)
« on: November 02, 2011, 03:16:16 PM »
@Meh - Exactly, it's the iris diaphragm that matters. Practically, since you have to actually do simple math (eek!) to determine that from the focal length and f/number, it's more practical to use those values to determine DoF.

LL's experiment with the gremlin is approximately correct. In fact, at the distances involved it's actually not the best approximation. I don't agree that the degree of unsharpness is identical - but it's close, good enough for approximation. I've tried an equivalent experiment, as a post hoc test, with my AFMA testing. Since I use 25x the focal length for all lenses, and the LensAlign fills the same proportion of the frame (i.e. distance and focal length are equal and opposite).  With an actual distance scale on the ruler, it's apparent that f/2.8 at 16mm (16-35/2.8L II) and at 200mm f/2.8 (70-200mm f/2.8L IS II), the measured DoF is the same, when distance and focal length are reciprocal.

Actually, the reduction of DoF to dependence only on magnification holds at macro distances (and for microscopy, although we usually call it axial resolution not DoF, and use numerical apertures vs. f/numbers).

Neuro: Please dumb this down for me... (you have done this many times  :) ) : Bokeh notwithstanding.... do i get more or less OOF blur (Quantity) is APC-S or with FF. Give me some numbers in feet etc if you can... cause "framing and similar terms are relative  :-\

I'm no neuro but I can take a shot to rephrase it into less technical terms....  we'll see if I have this right!

If you use the same lens, set to the same aperture, and place the camera the same distance from the subject, you will get more OOF blur with an APS-C sensor compared to a FF sensor.

If you use the same lens, set to the same aperture, and place the APS-C camera 1.6X further away from the subject than the FF camera (to get the same framing) you will get more OOF blur with the FF camera.

If you use the same lens, set to the same aperture, and place the APS-C camera 1.26X further away from the subject than the FF camera you will get the same OOF blur. (1.26 is the square root of the ratio of CoC of FF and APS-C)

If you use different lenses (two different focal lengths) on the same camera but set to the same aperture, and place the camera at the same distance from the subject, the shorter focal length will give less OOF blur.

If you use different lenses (two different focal lengths) on the same camera but set to the same aperture, and place each camera at 25X (or any multiple) of the focal length, both lenses will give the same OOF blur.  (This is the gremlin example on LL that keeps the subject the same size)

Canada / Re: Futureshop VIP sale Thursday, Aug 11th.
« on: November 02, 2011, 11:38:59 AM »
Best Buy now owns Future Shop. Curiously, they now often build stores side by side with BB targeting Joe Consumer and FS targeting the technophiles. I've spent a small fortune at FS since the late '80s and have never seen bait and switch. If they advertise a product that may not be in stock they always tag the ad with "limited quantites per store". But the only time this seems to be used is Boxing Day.

Agreed.  I've never had a problem with FutureShop.  Even the much maligned extended warranty program treated me well a number of years ago on a laptop that died.  It took a little over a week but they got working (claimed to have replaced components but who knows and it's still working and running XP fine despite being 7 years old (I use it as a backup/test machine).  I don't buy the extended warranty on laptops anymore... they're more reliable than they used to be and the replacement cost is low enough to just buy a new one in the unlikely event something goes wrong.

EOS Bodies / Re: Does a Digital camera need SLR?
« on: November 02, 2011, 10:51:54 AM »
Review of Fujifilm's image sensor phase-detect AF is explained on dpreview so it can be done.

They claim AF speed of 0.158 seconds but obviously DSLR AF is much faster since shooting at 10 frames per second and autofocusing in between frames must be less than 0.1 s.   So at least in those fuji compacts, that system is not as fast.
Im afraind you may confuse DSLR with AF. they may be quit different concept.
To be frank, 0.16s is rather quick for a mechanism. but DSLR is a optical route reflected by prism. which can can get a accurate image positoin on the film through finder.

or say, ccd or cmos sensetivity is faster than mechanism  movement which drive lens to a fit position. one is electronic, another is mechanism.

however, lens has a large mass.

I'm not confusing the two, but I can see why the way I wrote my comment may be unclear...   The Fuji is a mirrorless camera and is therefore not a DSLR.  So, my comment was comparing the 'phase-detect AF built into the image sensor of the Fuji' to the 'phase detect AF implemented in separate AF sensor of a DSLR'

Unfortunately, I'm not sure what your other comments are getting at but perhaps you also misunderstood why I referred to the fps of a DSLR.   I did that to demonstrate that the phase-detect AF in a DSLR using a separate sensor is much faster than the Fuji system... if a DSLR can shoot at 10fps then the AF must be able to focus in less than 0.1 s because it is happening in between each flip of the mirror.

Hopefully that's clearer than my shorter original comment.

EOS Bodies / Re: 5Diii vs 7Dii (FF vs APS-C)
« on: November 01, 2011, 07:50:50 PM »
Basically, aperture determines DoF.

Correct as usual but I'll add, just in case a few people don't know, it is the actual physical size (the diameter) of the aperture that affects DoF not the f-number (although the f-ratio typically falls out of optical formulae when you end up with an f/d).  If it wasn't for diffraction, a tiny aperture would render everything in focus with no need for a lens which is how a pinhole camera works.   Yes, in the DoF calculators you must plug in the f-ratio but that is just used (along with focal length) to calculate the diameter (in mm) of the aperture.  My turn to wait for a correction from neuro :)

Question to neuro (because I just tried but quickly gave up playing with the formulas):  changes in subject distance and focal have an opposite effect on DoF but is it equally offsetting for the same framing/subject size?  There is an article on Luminous Landscape that demonstrates that if camera position changed to keep subject size the same within the frame, DoF remained visually equal regardless of focal length.  This makes sense when one understands that the physical size of the aperture is smaller for shorter focal length lenses for the same f-number.  But is it mathematically equal at least first order?

EOS Bodies / Re: 5DM2 Purchase From Canada (Henrys) to USA
« on: November 01, 2011, 04:22:46 PM »
Hi all.

I'm a US citizen and noticed Henry's Camera has 5dM2 for a great price. I sent them an email and received this response: (they were NOT in stock at the time)

"Payment for items being shipped to the United States is by PayPal only.  The charge of $2012.95 is in Canadian Funds and will be exchanged into US funds at time of shipment.  We will not set US Funds exchange until then as the exchange rate varies on a daily basis."

Theoretically, if the camera was shipped today, the exchange rate would be: (2012.95 would convert to $1973.87 US Dollars)

I then sent them an email and requested if any other fees would be charges as I'm just trying to find out EXACTLY how much I will be charged.

They responded: "We have the camera in stock as of the writing of this email.  If you ordered today it should theoretically ship tomorrow.
There may be brokerage fees associated with your purchase, but they are set by the USPS."

I do not know what "Brokerage fees" are and sent an email requesting explanation but have not heard back. I then did some research via Google on the term "brokerage fee"  and found this:
NOTE on Brokerage Fees (there are none): Because USPS & CanadaPost have long standing agreements to handle each other's mail, brokers' fees are NEVER charged. EXPENSIVE BROKERS FEES MUST be CHARGED BY MOST OTHER COURIER/SHIPPING SERVICES. BUT NOT USPS or CANADA POST! :-)"

Could anyone tell me if Henry's is a reliable source and what the final charge would be for a 5dm2 purchase? Also, don't understand brokerage fees and i'm a bit skeptical at this point.

Thank you.

Henry's is very reliable, they are a major retailer in Canada.

Brokerage Fees are the fee the shipper will charge you to process the importation of the product.  USPS may not charge you anything.  UPS definitely will charge you brokerage fees for ground shipping but usually not for air shipping.  Note that my experience is based on shipping from the US to Canada.

EOS Bodies / Re: EOS-1D X Canon USA Press Release
« on: November 01, 2011, 04:03:47 PM »
Plotting the prices of current cameras from the T3/1100D through the 5DII, the best curve fit is a 2nd order polynomial (R2 = 0.99344)...

Neuro is the best.  Love it.  +1

EOS Bodies / Re: Big 5D Mark II Price Drops in Canada & USA
« on: November 01, 2011, 10:54:17 AM »
So, it is Nov 1st and the 5D2 is still $2000 here in Canada and the 5D2/24-105 kit is $2800. When are the rebates supposed to end?

Most of the Canadian retailers are still offering the 5D2 body for $1999 but don't have stock.  The Vistek website indicates they have stock but they increased their price a little over a week ago maybe because the stock at other stores was getting low (just guessing).  FutureShop website states the $1999 sale price is in effect until Dec31st and maybe it was FutureShop that led with that sale price... all the other retailers offer competitive price matching.  Futureshop is also out of stock now but I would expect them to have more on order if Canon even has stock.  I picked up the 5D2 body for $1899 last Friday when they had a one-day offer of $100 off any camera over $1000 in addition to any sale price.

EOS Bodies / Re: 5Diii vs 7Dii (FF vs APS-C)
« on: October 30, 2011, 10:15:15 PM »
No I wasn't - else I would have quoted your comment

Fair enough.  You'll forgive me for thinking so given that you commented immediately after me and I hadn't noticed anyone else had made a statement similar to what you put in quotations marks.

I wouldn't accept that the 7D is 'far superior for sports action photography' over the 5DII. It has the edge on AF and fps - but not that much - as it then loses out on iso. From experience it is in wildlife where the 7D pulls away more.

Interesting view and actually I appreciate that from someone who has used the 5D2 and 7D as extensively as you have.  I've used the 5D2 a few times (borrowed) but only just recently bought one since the prices are now so low and I'm glad to know it will be more useful for sports photography than I thought it would be.  I don't think the general consensus (going by what I've heard and read on this site and elsewhere) is that the 7D only has a small edge on the 5D2 for AF and fps.  It also has an edge over the 5D2 on weather sealing which is certainly beneficial for outdoor sports.

I feel that reading something into Flickr stats would apply only to Flickr users. Not that many serious or pro togs using Flickr - they have their own websites.

True, stats can be misleading if applied to populations that are not well represented by the sample population.  If there are few pro photographers posting to Flickr as you say then any insights can not be applied to pros.   Several of the comments about the Flickr data questioned the applicability and from a statistics perspective I think that there could be a bias in the "type of user".

I just copied the Flickr usage stats for Canon into Excel and added it up for fun (fun?) to see what it looks like for all camera types.  The "avg. daily users" is a one day snapshot so the numbers I have a different from what 7enderbender got and the "one day" thing is itself a limitation.  Data from yesterday is a total of 47,370 members posted a photo with a Canon camera.  Of those 34,218 (72%) were from a DSLR.   Of those 8,617 (25%) were from a 5D, 5D2, or 7D and 25,601 (75%) were from any other Canon DSLR.

I agree it's not something we can draw big conclusions from but it's interesting.

EOS Bodies / Re: 5Diii vs 7Dii (FF vs APS-C)
« on: October 30, 2011, 11:30:44 AM »
"progressed from a 7D to a 5DII" now that is a contentious statement.

This is a presumption that APS-C is the cheaper, less worthy camera and that only 'real' photographers graduate to full frame - ie sensor snobbery.

When will people realise that Full frame and Crop bodies are just tools for different jobs. One is not better than the other - just different.

If you're referring to my comment, then what I said was "picked up a 5D2 as they progressed in their photography" which did not imply that either camera was better than the other.  I agree they have different strengths and weaknesses... the 7D is far superior for sports action photography for example but the 5D2.  My point was only about the relative likelihood of the large group of 5D2 owners picking up a 7D as a second body vs. the opposite as a possible theory to explain the skew in the flickr stats and that theory was it's more likely that at this point in time, many more "enthusiasts" bought a 5D2 when it came out and did not add a 7D as a second body versus those that bought a 7D then also picked up a 5D2.

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