http://www.cameraquest.com/voigtlen.htm if you scroll about 80% of the way down, in the 50mm lens section, there's a small lens element diagram at the left margin.... Another thing, is how physically short the lens is. Must be a mild telephoto design to accomplish that.
I don't know if that is a telephoto type arrangement, but probably not since it's similar to the 35mm Color Skopar design.
Well, I think it is. Just look at the pincushion distortion. Same short build at higher focal length also says tele to me...
I can!
Erik.
Well, Joe, my post #8 was shot for the purpose of detecting linear distortion... You can see it in the door and door frame at right. The center of the frame bends slightly inward (to the left) while the top and bottom are a bit outward. At top the horizontal window frame seems to sag, but I'm pretty sure the glass is actually straight!