OP, there are many ways to get decent image quality at magnifications at magnifications above 1:10.
So, first things first. How much extension does your camera have? What's the range of magnifications at which you want to work?
If you don't give us this information the advice you get will be poor. Extension limits the magnification you can get given focal length. People will suggest lenses too long for your camera and desired range of magnifications. Lenses for use close-up are usually best at a relatively narrow range of magnifications. People will suggest lenses that will work for you but give poor results.
Pete, in my experience Tominon lenses in barrel for the Polaroid MP-4 are so-so
and the shorter ones (17, 35, 50) are very cost-effective. The 127/4.7 in shutter for, e.g., the Polaroid CU-5, is quite good up to 1:4 (as high as I've shot it).
You don't seem to know very much. Buy Lester Lefkowitz' book The Manual of Closeup Photography -- its available used via, in alphabetical order, abebooks.com, alibris.com, amazon.com, ... at reasonable prices -- and study it before you spend any money on equipment. Also read the macro section of my lens diary (
http://www.galerie-photo.com/telecha...2011-04-08.pdf in French,
http://www.galerie-photo.com/telecha...2011-03-29.pdf in English).
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