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The FD 35 Macrophoto is multicoated (it's a 6-element lens), but the 20mm is single coated (4-element/3-group lens like the Luminars). I haven't managed to get my hands on a Photar.
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Rich, I had a 75/4 1:1 Apo Rodagon D. Veeery interesting MTF curves, I think they're on Paul Butzi's site. Flat to the edge. And past the edge the MTF goes to zero, as in no image at all. I think the lens is a wide angle with very restrictive field stops.
Anyway, according to Rodenstock it shouldn't be used far from 1:1. And at 1:1 it doesn't cover 2x3. So I basically gave mine to a friend who wanted it.
Cheers,
Dan
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David, I hate to disagree with you but I think all of the Luminars but the 16/2.5 are triplets.
I have 25/3.5, 40/4.5, 63/4.5 and had a 100/6.3. Triplets all.
I had a 16/2.5 that appeared to have been cooked in an oven, the balsam had run out from between the two cemented elements to form a crust around the periphery of the first element. I have somewhere, probably can't find easily, drawings of cross-sections of all of 'em; they show the 16/2.5 as essentially a tessar with a field flattener, the others as triplets.
For those watching this discussion, we're deep into lens trivia that has no practical implications at all.
Cheers,
Dan
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