Will lens separation grow or affect image quality.

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I have a couple of days to approve purchase of a Schneider 300mm f5.6 Apo-Symmar. It has never been used yet has 8-10 1mm sized areas of lens element separation around the edges in the front portion of the lens. Will this affect image quality and is it likely to grow worse with time?

-- Eric Shaver (eshaver@earthlink.net), December 04, 1999


If the separation is only on the outer edge, it will most likely be diaphramed out when you stop down the aperture to shoot, so it probably has no effect on image quality. It may indeed get worse with time. It can be repaired if it gets bad enough ( I believe Steve Grimes offers this service).

-- Ron Shaw (shaw9@llnl.gov), December 07, 1999.

If this lens really is unused, but has this problem, I would be wary of it, as it might have other problems (such as element alignment) that are not immediately visible. But if your test shots don't show any problem, and the price is low enough, it might be years before the lens deteriorates further.

-- Alan Gibson (Alan.Gibson@technologist.com), December 07, 1999.

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