FDn 24mm f2.8 & Zuiko OM 24mm f2.8
Summary: These two follow the family trends already spoken of. At f8-11, on large prints, you are not likely to see much, if any difference between these lenses, because I cannot see it at 50% view – which is at least a 30″ print. For smaller prints, like A2, there is just no way you would detect any difference in resolution, CA or the technical parameters. All that is left if the subjective preference for one look over the other. I’ve shot several sets of frames with both and in trying to find a path through the conflicting performances, my view is that the sample variation (lens and adaptor) and distance is going to be the bigger factor than design differences. When one considers the almost cult status the OM 24mm has, this is a surprising result. I do wonder if the 24mm Zuiko is regarded so highly because it has been selected for small size and stunning central performance on crop sensors? On FF, in this case anyway, the Canon 24 f2.8 is right up there on its heels. I can say, however, that in every test I have done, the central performance has been higher with the Zuiko. In a word, its stunning. The 24mm FD f2.8 also suffers more than the others at f11. Where possible, I’d aim to shoot it at f8 where it gains significantly centrally, but loses next to nothing on the edges.
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