Michael,
There is a part of this review that I am not sure I am understanding correctly, and I would be grateful for some clarification.
In your snow post comparison of the Fuji S3's dynamic range against the Canon 20D's, you say "the green channel reading is 45 on the Fuji file and 35 on the Canon file. This is a real, and visible DR improvement...." Looking at the histograms, it appears that the Fuji S3 shot's exposure is closer to the right end than the 20D shot--more than 10 tonal levels closer to the extreme right of the histogram. In other words, it looks to me like the S3 shot is a hair more brightly exposed overall, perhaps a 5th of a stop.
Understandibly, there are substantial difficulties exposing to the exact same maximum level with two different cameras (even more so in field conditions), and I'm not castigating your efforts. I'm just wondering if the examples shown are actually demonstrating a (slight) DR advantage in the Fuji's favor, or merely demonstrating a slightly brighter exposure.
Would it not be the case that, if the exposures from both cameras had the exact same maximum tonal level, then the diagonal fence board's 10 level difference (Fuji S3's 45 vs. 20D's 35) would be nullified? If this is so, are we really seeing any DR improvement in the S3 in this comparison?
Or is the difference of the two histogram's distances from the right edge simply the result of normalizing the snow on top of the fence post to a reading of 235? (thereby making the histograms we see non-representative of the in-camera exposures)
Thanks for any clarification.
Cheers,
--Mike