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Messages - neuroanatomist

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7291
EOS Bodies / Re: 5D III AFMA for Zooms - Adjust Wide or Telephoto First?
« on: November 11, 2012, 09:42:04 PM »
For the most part, yes.

7292
EOS Bodies / Re: 5D III AFMA for Zooms - Adjust Wide or Telephoto First?
« on: November 11, 2012, 09:00:31 PM »
Are you sure it is linear and not based on any type of curve?


Pretty sure.  ;)  Especially since I tested it with 4 different lenses set to W = -10 and T = +10:


7293
EOS Bodies / Re: 5D III AFMA for Zooms - Adjust Wide or Telephoto First?
« on: November 11, 2012, 08:32:36 PM »
If you're all the way zoomed to the tele end, it doesn't matter how the W setting for AFMA is set, the camera uses only the T setting. Same when zoomed to the wide end, the T setting is ignored.  So, if you're just testing at the ends, order doesn't matter.  For any zoom setting that's not at the ends, the camera does a simple linear regression between the W and T values (even if one is set to zero).  If you want to test an in-between focal length (on the 24-105, I test at 24, 50, 85, and 105mm, to get an idea of performance across the range, and I test each FL at 25x and 50x the FL from the target), you must set both W and T to the same AFMA value.

7294
EOS Bodies - For Stills / Re: Help me upgrade my 550d
« on: November 11, 2012, 12:02:10 PM »
You mention being dissatisfied with the ISO performance of your 550D. The 7D uses the same sensor.

I think you'd be very happy with the 5DIII.

7295
Lenses / Re: 5D3 and TC's
« on: November 11, 2012, 11:16:50 AM »
Your 200/2.8 with a 2x will be 400/5.6 and will AF on any Canon body.

The Kenko TCs can mount on all lenses, the Canon ones only on some lenses.

7296
Depends on your use.  I'd say for outdoor portraits using a fast prime wide open, a variable ND might be a good choice.   The higher end ones will not have a significant negative impact on IQ. But for long exposure landscape shots, where you might be using a wide angle, I'd go with the standard NDs.

7297
Lenses / Re: Should I get 1.4x III or 2.0xIII extender - please help.
« on: November 11, 2012, 10:03:40 AM »
The 1.4xIII will cut AF speed by 50%, the 2xIII will cut it by 75%.  I've used 600mm f/4L IS II with the 2xIII for BIF and the AF is fast enough, but only just - and YMMV, as I'm using a 1-series body (the higher voltage battery drives the lens AF motor faster that a 7D can).

As for IQ, the 2xIII will do fine on the 300 II - in fact, the combo is similar to the 600/4 MkI (although the MkII is better).  I suspect the 1.4xIII would be a better choice for the 135L, though - that will take a bigger IQ hit from the 2x than the supertele.

I did the test you describe with my 600 II and 1D X, and the 2xIII delivered better IQ than the 1.4xIII cropped to the same FoV.

I haven't tried that with my 135L, in fact, I've never even used a TC with the 135L (probably because I've got the 70-200/2.8L IS II).

7298
Unlikely. It's not exactly a consumer product.  I asked my Zeiss rep about Christmas specials on confocal microscopes - he laughed.

7299
EOS Bodies - For Stills / Re: 1dx Custom Function question
« on: November 11, 2012, 08:30:24 AM »
I don't think you mean metering mode - that's evaluative, spot, partial, etc.

You mean auto exposure mode - P, Av, Tv, M.  That's the only thing that can't simply be changed on a C# setting. You need to set the new mode, re-establish all the other settings, then register.

7300
Tried a FaderND, IQ takes a noticeable hit. If you're going to go the vari ND route, I'd go Schneider/B+W or Singh-Ray.

Even with the top quality ones, there are problems at an AoV of wider that 24-28mm (on FF).  A vari ND is basically a pair of stacked polarizers, and just like a CPL results in uneven polarization at (ultra) wide angles, a vari ND has a 'Maltese cross' effect that gets worse the wider the angle and the darker the setting.

7301
Before you start the bracket series, reach your hand in front of your camera and snap an image with one finger held up. After the series, do the same but with two fingers.  Same thing for panos, if you shoot them.

7302
EOS Bodies - For Stills / Re: 1Dx ISO100 high DR shadows SNR improvement
« on: November 10, 2012, 11:42:18 AM »
Thanks, Neutral. Nice shot, and definitely improved by the post processing.

7303
EOS Bodies - For Stills / Re: Full frame or not???
« on: November 09, 2012, 11:20:05 PM »
as in you won't see much difference between the latest 7d and 5d...  i know the tech gooks that take pictures on camera targets on this forum will say different, but actual pictures i bet you can't....

Seriously? Maybe you'll see no difference if you're one of those folks that shoot at only ISO 400 and lower, but I shoot a lot in less than abundant light.   I shot with both a 7D and a 5DII routinely, and the 5DII had noticeably better high ISO performance.  ISO 3200 was tolerable on my 7D (barely), but quite usable on my 5DII.  I'm not talking about shooting test charts, I'm talking about shooting in the real (dimly-lit) world.  I would never use ISO 6400 on my 7D, and less than 6% of my 7D images are at ISO 3200 - and it would have been far lower if I'd had the v2 firmware's ability to set a cap on Auto ISO (which I have now, and it's set at ISO 1600).  On my 5DII, I used ISO 3200 frequently - over 15% of my shots were at ISO 3200 and higher.  On my 1D X, over 30% of my images are at ISO 3200 and higher.

So yes, it's not all about sensor size - the 1D X is certainly better than the 5DII at high ISO.  But sensor size plays a big role - and it's one that impacts everyday shooting.

7304
EOS Bodies - For Stills / Re: Convince me to shoot in RAW
« on: November 09, 2012, 06:06:15 PM »
Agreed. PP is often a crutch for those who can't get it right in camera.

I hear that a lot from old-school photogs and I have to agree I don't understand that position....

Often, it sounds more like a delayed ego-trip to me like from people that are not comfortable with the fact that some skills are not as valuable as they were in the analog days. Please don't get me wrong: It's good to learn the basics, but for some the necessity has decreased just like you don't do your balance sheets on a piece of paper w/o calculators nowadays.

+1

Someone skilled in 'the art' (whatever that art is), should become comfortable with new technological advances the that field. Learn to use Photoshop, dammit!

This from someone who dodged and burned when that meant cutting out masks and waving flags under an enlarger.

7305
EOS Bodies - For Stills / Re: Extenders with 5d3
« on: November 09, 2012, 01:31:30 PM »
A 2x TC will be f/11 with the 100-400mm, so you'll lose AF.  The 1.4x is f/8, so that works.  The Canon 1.4x will give you just the center AF point and the surrounding 4. 

FWIW, I'm pretty happy with the 100-400mm + 1.4xIII on my 1D X

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