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Questions & Answers
I have a Sigma 400mm
Sorry, but it's not a DIY fix as the lens will need to be collimated. Without this, you'll just be guessing the correct position and alignment for the loose optical element and won't get your image quality back.
Professional repair and re-collimation will not be cheap though and the lens may not fully recover its former sharpness, so it may be time to let your faithful friend go.
I hope my answer has assisted you in choosing a course of action; please take a moment to rate my reply.
on Dec 31, 2010
I need to know the value and info on this lense
There are two versions of this lens. The Telemacro version takes 77mm filters and is quite good. It sells for $325-400 depending upon condition. The other version "APO" is not very sharp and has low contrast. It takes a 72mm filter and usually sells for approx. $125-$200. I would not recommend this one for any serious photographer. The Telemacro version is a nice affordable 400mm lens with decent performance. Both lenses have slow AF, but the fast focusing alternatives are hundreds to thousands more.
on Oct 23, 2007
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