John Whittingham wrote: > > On Tue, 06 May 2008 08:34:08 -0400, P. J. Alling wrote >> Gaetan Beauchamp wrote: >>> Hello everyone! I would like to know how a Pentax 70-210mm qualifiy by >>> comparison to a Sigma 70-300 Apo for Pentax? Any ideas? Thank you all. >>> Gaetan B. >>> >> I can't say much about the Sigma, but the F 70-210 4~5.6 produces >> about the sharpest pictures I get from any zoom I own, except for >> maybe the Fa 20-35. It's also built like a tank, (with one >> significant internal weak point unfortunately). >> > I've heard rumour of the weak point, is it electronic?
Nope. Mechanical. It's a cast metal tab that's part of the zoom mechanism. It's screwed into an internal barrel and rides in a slot in a rotating outer sleeve (if I'm recalling this correctly). The screws that hold it in place can come out, or even be pulled out of their threads, and jam the zoom. Not catastrophic, but even greater (and potentially catastrophic) damage can be done through ham-fisted disassembly. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
