H4RDY,
Are you using the 90mmf/2.5 version or the later f/2.8 version on your FR11?
I'm a big user of Tamron lenses on the Contax/Yashica mount, but the 90mm I have is the earlier 'metal' f/2.5 (came in later platic shrouded f/2.5 and later stillf/2.8 version...bonus of the later 2.8 was it could go down to 1:1 macro ratio without tamron extention ring)
just some thoughts/ideas....
You're using a mount that these lense were designed to be used with, so there's no arfermarket issues you should have here....assuming everyhting works as it should...
I would take an educated guess that either the C/Y adaptall mount is defective, something come amiss with the FR11 focus screen, or the lenses focus mechanism is out of alignment...the later f/2.8 versions where known to have a weak mechanism there....we've had one in the shop like it.....also the earlier versions are getting to be vintage now, so could the lenses be in need or TLC or has been taken apart sometime in it's long life?
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