Like Wheatfield says, the optical quality of the S-M-C Takumar 90mm LS is fine. Nothing you really have to be concerned with. It also has a couple of other features. You can do double exposures with it and you can do pure leaf shutter shooting within its 1/30th - 1/500th range. You put the camera's shutter in a special mode half way between 1/1000 and X-sync, push the shutter button which will lock up the mirror and opens the shutter curtain, attach a cable release to the lens, arm it and shoot. You can read the process in the manual for the lens.
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