Good points; however, I am thinking not in terms of accuracy, but in terms of the manner in which I commonly use my camera and hand-held meter. I mostly use a hand-held--mostly in 1/3 increments--and so when I want to check it against my in-camera meter, I would like both to be in the same increments. Also, as I stated above, the F3 will let me turn the aperture ring until I get the "-+" target reading, and it will do this in 1/3 increments. For me, I suppose it is a matter of what I have become accustomed to doing.