Originally posted by Kayaker-J By any chance, have you tried out the close up lens on any of the Pentax lenses which have a fairly long minimum focus distance for their type, such as the DA 70mm/2.4 Limited? I have the Sigma Apochromatic close up lens which can do very well with some of my older Nikkors, such as the 200mm/4.0 AI-S and the 100-300mm/5.6 AI-S.
No, I haven't the luxury to have any higher-end limited lenses to try out. Also, this close-up lens set is not expensive glass... just your basic $10 set of vivitars which, under the right conditions, can produce something useful.