A former member of the group John Hargrave, now deceased, repaired his 70-210 with this fault, it seems to be fairly common, my first one developed the same problem. You can see the root cause in the third picture down in this link.
http://members.shaw.ca/hargravep/70-210.htm If you don't know exactly what you're doing when you try to effect the repair you will mangle the "information brush" which is now made of unobtainium. When mine failed both screws came loose and the information brush was mangled before I tried to repair it. I still have the lens if anyone wants it they can have it for $50.00 (I'll pay the postage in the US), KEH in Atlanta thinks they can repair it, (I got a quote from them for $100). The combined price is still less than these go for on ebay. When I was checking a few months ago one sold for almost $400, the cheapest price I saw was about $200. I bought a "new" one for considerably less. John Whittingham wrote: > I've heard rumour of the weak point, is it electronic? > > Regards, > > John > > On Tue, 06 May 2008 08:34:08 -0400, P. J. Alling wrote > >> 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). >> >> 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. >>> >>> >>> >>> >> -- >> Vote for Cthulhu. Why settle for a lesser evil... >> -- Dr. Jerry Pournelle >> >> -- >> 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. >> > > > ---------------------------------------------------------------------------------------------------- > > The information transmitted is intended only for the person to whom it is > addressed and may contain > confidential and/or privileged material. If you have received an email in > error please notify Carmel College > on [EMAIL PROTECTED] then delete all copies of it from your systems. > > Although Carmel College scans incoming and outgoing emails and email > attachments for viruses we cannot > guarantee a communication to be free of all viruses nor accept any > responsibility for viruses. > > Although Carmel College monitors incoming and outgoing emails for > inappropriate content, the college cannot > be held responsible for the views or expressions of the author. > The views expressed may not necessarily be those of Carmel College and Carmel > College cannot be held > responsible for any loss or injury resulting from the contents of a message. > > ---------------------------------------------------------------------------------------------------- > > > -- Vote for Cthulhu. Why settle for a lesser evil... -- Dr. Jerry Pournelle -- 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.
