ISO and actual sensitivity in DSLR's (D70, *istD, 20D, S3...)

We've seen the occasional postings about the ISO setting and the actual
sensitivity.

I picked up Casseur D'Images (No. 271, March 2005) and among other
things they did tests on a variety of DSLR's and one ZLR. (p. 169)

They rounded the results when close to the standard 1/3. But where a
little less clear cut, they put a +/- to indicate not quite in the 1/3 zone.

They describe, in punishing detail, the test method, references, math,
etc. Unfortunately, the 7D is not part of the grouping, but I'll take
sollace in the A200 results. Minolta have long been known for their
consistency in metering and exposure.

[There is also an article on the S3 and I'll summarize tomorrow]

Cheers,
Alan.

D70:
Setting: 200 400 800 1600
Actual: 160 320 640 1250


A200 (Minolta ZLR):
Setting: 50 100 200 400 800
Actual: 50+ 100 200 400 800


*istD:
Setting: 200 400 800 1600 3200
Actual: 250 500 1250- 2000 4000-


20D:
Setting: 100 200 400 800 1600 3200
Actual: 125 250 500 1000 2000 4000


S3:
Setting: 100 160 200 400 800 1600
Actual: 80 160 160+ 320 640+ 1250


1D Mk II
Setting: (L)50 100 200 400 800 1600 (H) 3200
Actual 64 160 320 640 1250 2500 4000


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