On 30 May 2003 at 1:10, Anthony Farr wrote: > The A50/1.7 has a common fault with its aperture ring that involves the "A" > button. The button sits in a strip of spring steel that is anchored at each end > to the plastic of the aperture ring (by small rivets IIRC). One of the rivets > sometimes fails causing the steel strip to stand proud at that end, which snags > a recessed area of the ring's inner surface and prevents movement to apertures > below f9.5 (again IIRC). It happened twice to my A50/1.7
I have also had this problem occur except in one of my cases the spring became completely disconnected, rotated then fouled the entire aperture ring mechanism. The "rivet" is actually a small thermoplastic projection which is simply melted and squashed in order to hold the metal spring, hardly adequate given how readily they fail. I repaired one with epoxy and another with a small screw, neither have failed again. Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
