danny_liao Posted January 10, 2005 Share Posted January 10, 2005 just wondering if seperation on a lens is still okay touse...particularly on a 90mm schneider.thanks Link to comment Share on other sites More sharing options...
darcy_cote Posted January 10, 2005 Share Posted January 10, 2005 I would stay away from it. I am no lens expert, but what I have heard it can scatter the light entering the lens thus causing the image to be soft/less sharp. Pay the extra money and be happy with your lens. In terms of resale also, not a good investment. Thumbs down Link to comment Share on other sites More sharing options...
michael_briggs2 Posted January 10, 2005 Share Posted January 10, 2005 If the separation is on the extreme edge of the glass, it probably won't matter when the lens is stopped down for taking a photo. My worry would be that the separation would grow with time. I wouldn't buy except at a hefty discount from the price of a lens in excellent condition. Which 90 mm Schneider? Angulon? Super-Angulon? How old? (There is a serial number / age table at http://www.schneideroptics.com/info/age_of_lenses/.) Link to comment Share on other sites More sharing options...
john_cremati Posted January 10, 2005 Share Posted January 10, 2005 SK Grimes has instructions on how to re-glue lenses like this on his web site and he also preforms the service .....John Cremati Link to comment Share on other sites More sharing options...
capocheny Posted January 10, 2005 Share Posted January 10, 2005 Danny, I'd agree with what Michael said and wouldn't even consider a purchase unless it was HEAVILY discounted. However, whatever decision you make, keep in mind that, in most cases, the separation only gets worse with time. If you get it for a REAL bargain...then it might be worthwhile sending it into S.K. Grimes and have them re-glue it. IMHO, given the low prices on most LF lenses these days (on *ba*) I'm not so sure I'd be spinning my wheels and taking the risks on a separated piece of glass! But, that's only my opinion. Good luck. Cheers Link to comment Share on other sites More sharing options...
danny_liao Posted January 10, 2005 Author Share Posted January 10, 2005 Thanks guys for such a quick response. The seperation is ONLY at the edge but my fear is it getting worst through time. I guess the best thing is to hold off on it. Thanks again. Link to comment Share on other sites More sharing options...
david_f._stein Posted January 11, 2005 Share Posted January 11, 2005 There are so many lenses available, the advise given is right on. But, really, when a 20-, 30-, 40- whatever-year-old lens has a smidgeon of lens separation, how bad is it going to get in another 2-3-4, 10 years? I have used many lenses that wouldn't pass a "loupe" test. They work just fine in the real world. Link to comment Share on other sites More sharing options...
huw_finney Posted January 11, 2005 Share Posted January 11, 2005 Once I was heating an old lens to about 200C to split it to re-glue. The heating alone fixed the problem, I cooled it slowly (just turned the oven off and left overnight) it is still ok. Worth a try. Link to comment Share on other sites More sharing options...
razzledog Posted January 12, 2005 Share Posted January 12, 2005 Well how about this? I took a chance and purchased a 90mm Caltar (Super Angulon) in a Copal 0 shutter that was dropped onto a concrete surface. The shutter split in two, bent the thing so bad the shutter leaves all fell out bar one! Front element shows serious signs of separation, rear element needed beating back into shape, but the bottom line is, it couldn`t be sharper when it was new! 4x5`s on Velvia 100F drum scanned are so good I wouldn`t part with it for Quids. Cheers, Dean. Link to comment Share on other sites More sharing options...
michael_beckmann Posted January 12, 2005 Share Posted January 12, 2005 Schneider may be able to repair it, but I predict it would involve the replacement of the front ot rear element of the lens. I would do that if the lens was fairly recent. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now