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DPChallenge Forums >> Hardware and Software >> Extended ISO range (e.g. 20D, 5d etc) - why?
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Showing posts 26 - 28 of 28, (reverse)
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 04/25/2006 04:31:58 PM · #26
Originally posted by Prof_Fate:
Originally posted by jent:
I am sure I already know the anwser to this (since I know the camera pretty well). But does the 10D have this option? I would love to be able to get 50 iso as my new min. :-)


Only the 5D has the ISO 50. So I guess you need to buy one. ;)


FWIW, the 1DII has an ISO 50 option too. I'd be interested in a reference to confirm that the ISO 50 and ISO 3200 were not hardware gain settings too btw.
 04/25/2006 04:41:43 PM · #27
Originally posted by Are_62:
Interesting discussion but a couple of points worth mentioning:
2) The best dynamic range of both the 5D and 1D Mark II cameras is ISO 200. ISO 100 will actually limit the dynamic range somewhat. I believe this is also the case with the 20D, 30D and 350D.



Where did you get this information?
From my attempt at googling the bst i cold find was that the higher the ISO the higher the dynamic range, but also the more noise. The way a chiop works to get higher ISO is to turn up the volume on the photosites and that adds noise. So I suppose there is some truth to what you're saying, but I didn't find any evidence, only some forum talk and rumours and theory that was unsupported.

IN the studio you shoot 100 becuase you got too much light already (common Ap settings are F8-11) so going to 200 makes it F11-16!
 04/25/2006 04:59:57 PM · #28
I think if you scour the DPReview forums, you'll come across some tests done with Norman Koren's Imatest. Imatest is a very reliable program, but is ony as good as the inpout data. The differences in dynamic range between 100 ISO and 200 ISO are probably within test repeatability. In any case, I'm not gonna start shooting 200 ISO to gain a small fraction of a stop DR.
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