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a question , when I use a lens with minimum forces distance of 1.64, I can obviously use the lens at longer focal distance. I am finding that when I use a Nikon extension tube I can only focus at close distances, not at longer ones. Is this the way it should work, extension tubes make the lens good only at close distances?
also, if I want a 50mm autofocus using Sony Nex , is there any reason to buy the new 55mm FF lens as opposed to the 50 mm Touit which is only for aspc lenses? thank u joanlvh