Originally posted by Not a Number Wait, I'm confused. I thought the Bellows Unit II is the one with two round rails while the later Auto Bellows and Bellow Unit III/K have the single X-beam rail. The X-beam units have an integrated focus slider while the Unit II requires an add-on focus rail.
Yes the Pentax bellow/auto bellows line-up
IS confusing. There was also a Bellows II for K-Mount with a single rail which was the original K Series bellows.
See this thread:
https://www.pentaxforums.com/forums/8-pentax-film-slr-discussion/248580-bello...de-copier.html
Phil.