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Forum: Pentax SLR Lens Discussion
08-11-2017, 09:19 AM
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The dfa100mm is terrifically sharp at all distances, and the dfa50mm appears to be as well. I think most of the complaints about the performance of macro lenses at far distances stems from older 'inert' designs (all lens elements move as one group when focusing) that were optimized for close up work at the expense of distance stuff. Pentax touts the FREE (fixed rear element extension) design as a component to upping the dfa macro's awesomeness at all distances (I'm paraphrasing here:)). I think versions date back to the mid 80's for Pentax.
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