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Messages - neuroanatomist

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EOS Bodies - For Stills / Re: Help with 1D X serial number
« on: July 31, 2012, 06:44:23 AM »
Probably not, unless everyone posts theirs which is unlikely.

But...why do you care?

EOS Bodies / Re: 5d mkiii and no AF at F8
« on: July 30, 2012, 09:06:47 PM »
All cameras autofocus wide open, and then stop down to the selected aperture just before exposure.  Plus, the issue is with a lens wide open.  Since basically all current autofocus lenses are f/5.6 for faster, or at least they tell the camera that, the limitation really only applies when using slower lenses with teleconverters.

The reason it's mentioned, especially in connection with the 1D X, is that previous 1-series bodies had the ability to AF at the center point with an f/8 combo.

EOS Bodies - For Stills / Re: 1D X ISO Shots
« on: July 30, 2012, 08:47:42 PM »
There are quite a number of other differences between the 1DX and the 5DIII, but none of them are any more significant to real-world shooting than the noise difference we see here.

Depends on your definition - if you're talking only IQ, fine.  But...better sealing and 250K more shutter actuations seem like they benefit real world shooting, not to mention the improved metering.

What else could it be?

It's a Rebel/xxxD series camera.  The people who write them just wrapped up the 5DIII reviews, got about 100 words written on the T4i, then their 1D X's showed up and captured their attention. 

EOS Bodies / Re: B & H shipping...
« on: July 30, 2012, 05:46:29 PM »
Depends on the item.  If it says Free Shipping, UPS Ground is free (although IIRC, items <$100 use a hybrid shipping method where USPS does the last step). 

My 1D X shipped free...   ;)

EOS Bodies - For Stills / Re: 1D X ISO Shots
« on: July 30, 2012, 04:55:48 PM »
There's lots to set the one apart from the other, but noise isn't one of those factors.

Unless you mean the audible variety of noise - compared to the silent mode of the 5DIII, the 1D X shutter sound (even in the nominally silent mode) is loud!   :P

Main risk is the Li-ion battery in the camera - heat shortens it's useful life, sometimes dramatically, especially if the battery is fully charged when exposed to 'car in the sun' temps.

It shouldn't be doing it when the camera is powering up...

It should be, actually.  However, unlike when you switch it off, at power up the sensor cleaning message doesn't fill the rear LCD, it's indicated by a small animated icon on the rear LCD.  Also, the power up sensor clean is immediately interrupted if you take a picture.

If you are doing your tests indoors on a normal floor you will see different results.  The reason is any vibration in the floor impacts your camera.  I found that I couldn't run the test on the main floor of my house, I had to move to the garage with its concrete floor.  Concrete basement would have also worked.  I also use a double halogen work light to keep the target well lit.

When trying to test my 100-400 lens there was enough of a breeze outside to slightly vibrate the tripod, again that was enough to throw the test off (or more to the point the graph is all over the place making it hard to determine the right adjustment).

Indeed, vibration is a killer.  I did testing a while back on my first floor (hardwood) and it worked ok with an empty house but had lots of failed runs if my daughters were running around.  The basement works well.  To go over 45 feet distance, I need to go outside - I used constant lighting to supplement the daylight, set ISO 400, and found that even at 400mm f/5.6 I got consistent results despite an occasional zephyr, likely because I was getting 1/1600 s shutter speeds.

FleaBay or Craigslist, or perhaps  Basically, sell it at a bit of a loss or keep it as a backup, and buy the 1D X outright.

I was tempted by the 5DIII, but glad I held out for the 1D X.

Lenses / Re: What lens(es) should I consider for next purchase?
« on: July 30, 2012, 02:32:23 PM »
MP-E 65mm and TS-E 24mm f/3.5L II.  :D

EOS Bodies - For Stills / Re: 5d III - Number of Shutter Actuations?
« on: July 30, 2012, 02:24:34 PM »
Canonian, i believe that the 5DIII and the 1D X's menus are very similar.  On the 1D X there is a system status option in the menu's, i cant remember exactly where, but that gives you the total actuations to the nearest 1000.
Hope that helps.

I don't think that option is available on the 5DIII.

My self-portrait camera cost the equivalent more than 400 1D X bodies...

DICOM metadata (medical imaging's EXIF): GE Signa HDxt 1.5 Tesla MRI with 8-channel birdcage coil, T1-weighted image, spin echo sequence, TE=10 milliseconds (sort of like 1/100 shutter speed)


Third Party Manufacturers / Re: Question for Kirk L-Plate users
« on: July 30, 2012, 01:54:58 PM »
...the Wimberley C12 clamp is advertised as fitting the retaining lugs on the stems of, among others, Giotto's ball heads so I'll probably go with those. It's an expense I could do without but, you live and you learn.

Indeed.  I started with the Manfrotto RC2 system before I 'learned'.  ;)  I have a couple of the Wimberley C-12 clamps and they work very well.  I've used them with plates from Wimberley, RRS, and Kirk, all clamp in securely. 

For my 50mm 1.4 I noticed severe vignetting as well. I might just send it to Canon to get it checked.

The 50/1.4 has ~2.5 stops of vignetting wide open.

From what I recall the EV value was around 7.2. I think I may need to illuminate the target a bit more.

Should be at least EV 8 according to the manual, and the more light the better.  If your shutter speed is too low, and there's any instability in your setup (e.g. not using a cable release), that also results in instability.  With my bright lighting, I can shoot even f/5.6 lenses at 1/1000 s or faster without going over ISO 400.

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