Originally Posted by bdial
This video by our own Jason Brunner may help some in unraveling the lens's mysteries;
After following the instruction on this video, seems that the lens is a 200mm with an aperture of f/15.3 I'll just say ƒ/16.
So I have f/16, f/22, f/28, f/40, f/66 and f/100
Seems about right I hope