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I am considering a macro lens for my Leica TL2. The L mount Macro is 60mm and while yielding 1:1 macro, the focus distance to an animate subject is really too close to be useful.It would tend to make the little critters a bit jumpy. There are other alternatives such as a FF 100mm or 105mm Nikon F mount Tokina or Nikkor with a NIK to L mount lens adapter. So, I am considering a used Leica Macro-Elmar R 100mm lens which, with the macro adapter, results in a 1:1.6 image with a full frame 35mm Leica R camera. So, it seems to me that this lens combination ( lens + Leica R macro adapter) used with an R to L mount lens adapter should yield an image closer to !:1 macro when taking into account the 1.5 sensor ratio between FFG and APSC. The area of a FF sensor or negative is 864 square mm (36mm x 24mm). The area of an APSC sensor is 357.87 square. So an APSC sensor has .415 the area of a FF sensor. Or inversely, the ratio of the FF area/ TheAPSC area is 2.41. So the area of the APSC is close to one half. The Macro-Elmar 100mm with macro adapter yields a reproduction ratio of 1:1.6 on a FF sensor. So doesn't it make sense that a FF Macro lens with a reproduction ratio of 1:1:6 would yield an effective reproduction ratio on an APSC sensor of 1: 114 or very close to 1:1? Think about it and let me know your thoughts. Am I thinking straight, or should I reconsider?
