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Messages - neuroanatomist

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7981
EOS Bodies / Re: 7D vs 5D2???
« on: November 20, 2012, 04:25:11 PM »
Thus, the main difference is that with the 7D you have 18 MP, and with the 5DII you have 8 MP.
Help me out here, neuro. My 5DmkII has way more than 8MP...it's 21.1.  What do you mean by 8MP?

The 7D is a 'crop sensor' - that means it samples only a small portion of the FF image circle.  That's the basis of the 'reach' argument for APS-C (red is FF, blue is APS-C):



If you crop the 5DII image down to the field of view of the 7D (e.g. crop the red image to the blue image, above), you'd be left with 8 MP of your original 21 MP. 

7982
It's not the same sensor.  Canon's web site describes it as a new design.

Of course it's not the same - it's 20 MP, not 22 MP.  But if it uses the same production technologies found in the 5DIII and 5DII, the IQ should only be marginally different, if at all.

7983
EOS Bodies / Re: 7D vs 5D2???
« on: November 20, 2012, 04:00:14 PM »
Upgrading from the 550d->7d with the same sensor also doesn't seem that smart to me unless you get a very good deal ... better wait for the 7d2 or 70d with probably a better sensor that'll solve your problem.

+1.

I'd also add that it's important to consider what you do with the images you capture.  Do you print them large?  Submit them to magazines or contests which have a minimum MP requirement for the final image?  Here's the thing...if you take an image with the same focal length and lens from the same distance with the 5DII vs. 7D, then crop the resulting 5DII image to the framing of the 7D, what you'll have is an image with IQ that's pretty much a wash with the 7D.  With minimal processing, the 7D image is a little sharper, the 5DII image has a little less noise - and of course, you can trade the sharpness for the noise and vice versa...a wash.  Thus, the main difference is that with the 7D you have 18 MP, and with the 5DII you have 8 MP.  If 8 MP is sufficient for your needs (~12x18 prints and smaller), then the 7D has no reach advantage.  Where the 7D does have an advantage over the 5DII is in AF performance and frame rate.  But...the 5DII will be slightly better than your T2i in terms of AF and frame rate.  If you don't need to crop the image, the 5DII will deliver much better IQ and much better high ISO performance.

So...I'd say ignore the crop factor 'reach'.  If the AF and frame rate of your T2i are good enough for your shooting, getting the 5DII is your best option.  But if you feel you'd benefit more from better AF and a faster frame rate, the 7D is great.

7984
Lenses / Re: Is the EF 800 f/5.6L IS Due for Replacement? [CR2]
« on: November 20, 2012, 01:44:35 PM »
Here is a picture of two of the now extinct FD 1200's with TC at the 1984 LA Olympics.

What are those two odd-looking black lenses in the picture?   ;)

7985
Interesting read indeed. I have a few 600rt's and both bodies, I am going to test side-by-side to see if I can replicate.

Thanks!

7986
With different people seeing different things with the same platform, I wonder if someone who has it working (on say a 5DIII or 1DX) would be okay with posting their camera's config file.

Has to be a 1D X, right?  The 5DIII doesn't have the ability to save/load settings from a memory card.  If someone having this problem on a 1D X wants to try, PM me and I'll send you a .CSD file.

7987
Canon General / Re: New and improved Canon bodies in development?!
« on: November 20, 2012, 01:25:42 PM »
Old lens, and a slow one, too.  How the #&^$#@ am I gonna find a UV/clear protection filter for that monster?

7988
EOS Bodies - For Stills / Re: 5D mark III or 7D and 5D mark II
« on: November 20, 2012, 01:23:57 PM »
...but with a 1.4x TC, your AF will be slower which is not good for birds photography... now, the question is how much slower?

It will depend a lot on the lens being used with the TC.  I can't speak for the 5DIII (or 6D, obviously), but even with the 2xIII (slows AF by 75%), the 1D X and 600/4 II do well for BIF.

7989
Lenses / Re: Is the EF 800 f/5.6L IS Due for Replacement? [CR2]
« on: November 20, 2012, 10:50:43 AM »
But with the 600mm + 1.4TC delivering almost as good IQ, there's not going to be many more sales of the 800mm (except for those who 'must' have 1600mm).

Actually, I think the 600/4 II + 1.4xIII actually delivers slightly better IQ than the 800/5.6, and the 600/4 II + 1.4xIII delivers better IQ than the 800/5.6 + 1.4xIII, as well.  In both cases, in addition to better IQ, the 600+TC is lighter, cheaper, and slightly longer in focal length.  So, the 800/5.6 really has no remaining advantages, except as you note to achieve 1600mm (at the cost of loss of AF at f/11 and a big IQ hit, such that cropping from 1200mm is probably better). 

Personally, I think it's likely we'll see an updated 800/5.6 sooner than expected, and the main reason is that the current one cannot compete with the new 600 II (and secondarily, because Nikon is releasing one).

7990
EOS Bodies - For Stills / Re: 5D mark III or 7D and 5D mark II
« on: November 20, 2012, 10:23:20 AM »
The combo 1D mark IV and 300 f4 yes, but the 1.3 crop factor surely helps...

The 2x TC helps more.  I had been considering getting a 1DIV to replace my 7D, for birds/wildlife with the 1.3x and as a backup camera (which is all my 7D really is at this point).  But...someone on TDP did a very nice comparison of the 1DIV vs. the 1D X cropped to match the FoV (using a 500/4 II), and I must say it was really hard to discern any difference.  So I've basically discarded the idea of getting the 1DIV.  Not sure if it's even worth keeping the 7D as a backup, actually selling that and getting a 6D instead might be the way to go...

7991
EOS Bodies - For Stills / Re: 5D mark III or 7D and 5D mark II
« on: November 20, 2012, 09:54:25 AM »
Thanks for the sample ! It works very well ;)

Initially i was thinking about the great, sharp and light 300 f4 L IS but i think it'll be too short coupled with a FF for wildlife photography :(

I agree that 300mm on FF is pretty short for wildlife.  But consider - you could use a 300/4 IS with a 2xTC for a 600mm combo.  I ran into Lillian Stokes (as in the Stokes Guide) on a mountaintop in Hew Hampshire a couple of years ago, and she mentioned that she usually shot with a 1D IV, 300/4L IS, and 2xII becuase the combo is light enough to carry.

I'm sure a new 100-400 will be better, but the current one is quite decent, and I prefer it to the 70-300L for the extra reach and compatibility with the 1.4x TC.  I have the 600 II, but sometimes that's too much for a short outing, and the 1D X with the 100-400 w/ 1.4x is a more portable combination.  I hang that from my Blackrapid strap, put the 40mm f/2.8 pancake in my pocket, and I'm good to go...

7992
Lenses / Re: 600mm F/4L IS AFMA settings
« on: November 20, 2012, 09:42:00 AM »
I test all lenses at both 25x and 50x the focal length, and I use the standard FoCal target.  So, for a 600mm lens that's 49 ft (15 m) and 98 ft (30 m).  Since I'm using a multiple of the focal length, the target size in the image is the same with any lens (e.g. 24mm at 3.9' is the same FoV as 600mm at 98'). 

I suspect your problem is either having too much vibration and/or not having enough light.  How stable is your setup and what was the EV reported for the test?

When I first started using FoCal, I ran tests on the main floor of my house (hardwood floors), and I had several failed tests.  I moved the setup to the basement (concrete slab) and had none.  Also, I use lots of light - I point three 150 W-equivalent gooseneck lamps at the target from a distance of 12-14", and my reported EVs are in the 11-12 range when I test indoors.  For my 600/4 II, I ran the test outdoors in direct sunlight, and still had the 3 150 W-equivalent lamps pointed at the target, so my EVs were in the 15-16 range.  That gave me shutter speeds of 1/1250 s with the f/5.6 combo with the 1.4xIII.  I still haven't done the 600 II with the 2xIII testing - I need to find a vacant football field for that...

7993
Pricewatch Deals / Re: Black Friday at Adorama
« on: November 20, 2012, 09:17:00 AM »
The canon 40 mm pancake lens for $149 seems to be One of the better items featured on this adorama "sale"

The price is $199 and Canon has a $50 instant savings rebate right now...so, it's $149 everywhere.

7994
Do you happen to have a 5D3 as well that you could test?

Sorry, no.

7995
EOS Bodies - For Stills / Re: 1Dx Af points
« on: November 20, 2012, 08:55:06 AM »
You can set the multicontroller for direct AF point selection in Custom Controls (so you can just move it, no need to press the AF point selection button first).  You can also set the manual AF point selection pattern to Continuous so it 'wraps' - e.g. when you get to the left side, one more left press takes you to the right side.

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