This question is not about telephoto or retrofocus designs, but about "standard" Large Format lenses.
According to the this brochure, the 210mm Rodenstock APO Sironar S has a "flange focal distance" of 202mm when focused to infinity. Does that mean it's actually a 202mm lens ?
According to this brochure, the 210mm Rodenstock APO Sironar N has an "optical register" of 200mm when focused to infinity. Does that mean it's actually a 200mm lens ?
According to this brochure, the 200mm Nikkor M has an flange focal distance of 194mm when focused to infinity. Does that mean it's actually a 194mm lens ? Similarly, is the 300mm Nikkor M really a 290mm lens ?
I know the differences are fairly minor, but I am just wondering and appreciate the help.
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