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07-27-2012, 06:38 AM   #1
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Why is 645D so slow with ISO?

OK, next to film the 645D is not that slow. Is the 645D slow because Kodak just made slow sensors? Or will MF always be slower than smaller sensors?

07-27-2012, 06:52 AM   #2
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You mean the top at iso1600? Well I think that is a limitation for the CCD sensor. There are CCD sensors that go up to iso3200, but it aint CMos.
07-27-2012, 06:53 AM   #3
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I think 645D is 1000?

But I may be wrong.
07-27-2012, 07:37 AM   #4
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It's 1600 expanded, 1000 normally I believe.


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07-27-2012, 12:50 PM   #5
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Medium format ISO 3200 film is not as grainy as small format film. You get decent results and probably about the same as a slightly older DSLR at ISO 3200 with no noise reduction applied.
07-27-2012, 02:15 PM   #6
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I believe CCD sensors are optimised for low ISO IQ, not high ISO IQ. They also receive considerably less research investment these days now that CMOS is king, so they are not as advanced.

Considering the target buyer of the cameras, optimisation for low ISO IQ is best (though as far as I'm concerned this should be the case for all cameras).
07-27-2012, 02:38 PM   #7
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QuoteOriginally posted by tuco Quote
Medium format ISO 3200 film is not as grainy as small format film. You get decent results and probably about the same as a slightly older DSLR at ISO 3200 with no noise reduction applied.

Didn't know film went that high. Fastest I used 40 years ago was Royal X...1200 ASA
07-27-2012, 02:48 PM - 1 Like   #8
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QuoteOriginally posted by slackercruster Quote
Didn't know film went that high. Fastest I used 40 years ago was Royal X...1200 ASA
That's a long time.

Here is Delta 3200 on 120 film. At 100% there is a lot of grain and blacks don't have as much scale in them just like digital at high ISO. But film's natural response to highlights (compresses them) makes for better shots with lights, IMHO.







07-27-2012, 07:10 PM - 1 Like   #9
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The 645D isn't targetted for photography requiring high ISO to compensate for poor conditions. It's meant for photography where the photographer either has a great deal of control of the exposure external to the camera (lighting) or has time to set up the shot carefully and use slower shutter speeds.

You don't need ISO 51200 for portraiture, fine art, landscape and architecture work. What you do need is extremely good dynamic range and signal to noise ratios.

FWIW - the max ISO on the Hasselblad H4D-60 is 800 and it sells for over $30K USD for the body alone.
07-27-2012, 08:35 PM   #10
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Makes sense. Thanks for the rundown Venturi.
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