Then try the 210 and 300mm Makro Sironar lenses. With the front and rear in their normal positions the lenses were optimized for 1:3 to 1:1. Manually unscrew and switch their positions in the shutter and they were corrected for 1:1 to 3:1. A pictograph on the front and rear cell rims showed which went where for the different ranges.
Not a floating element by most people's definition but performed the same task.
At infinity both were mediocre, but from 1:3 to 3:1 with 3 dimensional subjects they were superior optics!
The 120 and 180mm Apo Macro Sironar lenses and the 120mm Apo Macro Sironar Digital lenses are corrected for 1:5 to 2:1 without having to swap the cells around. These lenses replaced the earlier Makro Sironar lenses.
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