Hello Everyone, I am a longtime amateur Pentax owner/user who is about to switch from film to digital format, and am looking to learn about it. I hope to use some M42 takumars I have on a K7 body. I've been researching serial numbers on 50mm 1.4 lenses, trying to determine at what point the lenses transition from 8 element to seven. I am also looking for some missing parts for my auto bellows and will post details in the marketplace. It has been my feeling for years that Pentax equipment was under appreciated by the "pro crowd". How interesting that in today's market, the old thread mount takumars are sought after and one reads about "smooth and silky action", "precise focusing", all metal construction! Never imagined we'd get to that!