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Old Oct 13, 2007, 10:19 PM   #1
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A few general questions about the 40D.

Can you select between 12 and 14-bit a/d? Or is it permanently set to 14-bit?

Once in 14-bit mode will you still get 6.5 fps? Or does the fps rate drop? Though, if the 40D is permanently set to 14-bit then obviously the fps will stay at 6.5. Just curious.

Thanks.
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Old Oct 14, 2007, 2:54 AM   #2
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I just purchased the 40D, and I have been looking at the instruction manual, and I can't find the answer to your question. Do you have any hints as to where I should look in the instruction manual? I would be happy to help and I would like to know myself. Unfortunately, I am busy at work, I have the manual with me, but I can't read thru it, I have too much to do, but if you got a suggestion I could browse thru it. Let me know
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Old Oct 14, 2007, 3:15 AM   #3
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It's always 14-bit.

Both 12 and 14 bit images are encoded in a 16-bit address space anyway, so it's not taking up any extra space on disk or anything.
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Old Oct 14, 2007, 3:49 AM   #4
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And no, shooting in 14 bit does not decrease the fps. But, expect a bit slower with ai-servo depending on the circumstance.

Canon's focus system is a bit strange in ai-servo in that if there is no focus lock on the first shot the camera fires away at full blast. BUT, if the first shot has a focus lock the camera will constantly try to keep the lock and you can see slower results than 6.5.
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Old Oct 14, 2007, 11:43 AM   #5
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JohnG wrote:
Quote:
Canon's focus system is a bit strange in ai-servo in that if there is no focus lock on the first shot the camera fires away at full blast. BUT, if the first shot has a focus lock the camera will constantly try to keep the lock and you can see slower results than 6.5.
-> You can overide the focus lock with C-Fn-21 on the 1D series (I don't know about the 40D though) to keep up the frames rate

However on the D300 (or Minolta/Sony too) you can set the AF/shutter priority independent of the AF modes... if you prefer to maintain the frame rate
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Old Oct 14, 2007, 12:00 PM   #6
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Ok thanks guys. I asked because I read in the "preview" of the Nikon D300 that when it's set to 14-bit the fps drops from 6 fps to 2.5. Though that hasn't been confirmed yet with actual testing.

Maybe I should have tested that out when I had one in my hand yesterday. I was at the local annual photography show. Damn!!

I did get the 40D's "Sales Guide brochure". Didn't see any mention of reduced fps or if you could change the bit rate. So you're probably right.

Later guys.
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