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Message: <blockquote data-quote="hollis_f" data-source="post: 1497198" data-attributes="member: 14566">Not having a tame bird to pose for shots against a bright background I used a toy House Sparrow with a pencil shoved up its anatomy. Luckily the sky was cloudless so the light was unchanging. I used my 70-200 mm f4 at 90mm and 200mm (results were the same at both FLs, so only the 200mm shots shown).I lined up the shots so that only the bird (and its pencil) were in the frame. Both cameras were set to Av, f8, ISO100, evaluative metering.The results were not what I was expecting but still quite interesting. Both cameras chose a shutter speed of 1/500s. Damn, thought I, another lovely theory destroyed by an ugly fact. But then I looked at the pictures (both images resized to 2000 x 1333 then a 600x800 crop taken from the centre.Despite having the same exposure values the 40D (left) looks underexposed. The 50D has done a much better job of getting the bird exposed correctly.</blockquote>