I've just aquired this lens and been using it for about a week, Is it normal with my 1D2 to produce CR2 files, hand held nearly always over 10mb and some I took today, hand held again of 13mb plus, the lens seems quite exceptional.
CR2 file size depends on your subject matter. I used this lens at a pumpkin farm last fall and the files were consistently right around 10 mb, even with a blue sky taking up to one-third of the image. Portraits of my kid in front of a house, for example, resulted in files sizes around 8 mb.
If you have a lot of smooth bokeh or single color/shade in picture and use low ISO then picture will be smaller. If picture has a lot of texture and edges and/or high ISO is used then RAW file will be bigger. Also different cameras have different anti-alias filters, different ISO performance and different RAW compression so file sizes are not comparable between different camera models even same mega pixel sensor is used.
CZ 28/2.8 has so high micro contrast and acutance that it typically creates much larger file sizes of similar subjects than for example Canon EF17-40mm f/4 L USM or Canon EF28mm f/1.8 USM at similar conditions with similar framing.
CZ 35 ZF creates also similarly huge files, but with CZ 100 ZF it's much more difficult since at that long focal length the depth of field tends to be rather small.
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Samuli Vahonen http://www.vahonen.com
Thanks for all the replys. The subjects were of forest, lots of edges ect, so that would explain the extra file size, just never seen anything that size from my "L" lenses.
