Smiert Spionam Offline Upload & Sell: On
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I doubt the optical differences are worth quibbling about much one way or another. The biggest question is whether you want a fully manual lens, or AF and auto aperture. For most people, when you have a good quality native mount option like the EF, the modern lens will be more useful. If you plan to use it on a mirrorless or other system where you won't be able to take advantage of the mod cons, the older lens will be a lot more comfortable and satisfying to shoot.
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