> I was gonna say M4.0 200, but you may be right. 4.0 200 of some > sort, would be my guess...
Perhaps. It just seemed to me that the diaphragm ring, which shows knurled ridges all the way around (without a gap for the numerals) looks "K-ish" to me. (My K 135/2.5 and my K 200/2.5 look that way.) Of course, I'm missing the point of the entire photograph - <g>... Fred
