Peter Kotsinadelis wrote: > You left out your usual epistle about the Opic. ;-) LOL. Speaking of which... I finally found a block diagram of the SK Xenon used on Retinas, and they are a dead ringer for the Opic (as heavily derived from the original Planar). This is really a wonderful lens. The Longar and Curtar convertibles are not exactly stellar, but the Xenon itself is terrific... great look and character... Anyone who want to see the diagram can contact me off list... I found lens diagrams for the convertibles, too... Eric Goldstein