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Re: [OM] Tamron Adaptall OL vs OM screw locations

Subject: Re: [OM] Tamron Adaptall OL vs OM screw locations
From: Kennedy McEwen <rkm@xxxxxxxxxxxxxxxxxxxx>
Date: Fri, 25 Jul 2003 23:30:02 +0100
In article , JMeyers102@xxxxxxx writes
Hi,

I missed the reason as to why one version is good, and one bad. I see from
the 2 auctions cited that the mounts are different, at least with regard to the
screw positions. But is it the screw positions themselves that is the problem,
or some other aspect of the mount. Would someone please explain why one is
problematic. (I gather that the difference only applies to OM-3 and OM-4 bodies).

With these bodies the spot meter reset switch is built into the lens flange and on some lenses the screws wipe over the switch, slicing the top off it, if they happen to be in the wrong place.

Whilst Olympus always used three screws on the lens mount and the switch was positioned to avoid these, many independent manufacturers used four symmetrically placed - guaranteed to ruin the camera if fitted to a body with such a reset switch.

Took me all of 3 minutes to achieve this on a brand new OM-4 back in 1984 - then I read the little pink warning sheet Olympus had placed inside the instruction book. Honestly, how stupid would you have to be to need to read an instruction book? :-(

Fortunately, Olympus repaired it under warranty, but in the process damaged the top plate, which meant a further repair, taking three months in total. I don't know if this was related, but that OM-4 was the least reliable Olympus camera I ever owned and eventually I sold it after its 3rd warranty circuit replacement (of 7 repairs including those first two). I just hope that my current one, having just been repaired recently, hasn't started down the same track.
--
Kennedy
Yes, Socrates himself is particularly missed;
A lovely little thinker, but a bugger when he's pissed.
Python Philosophers

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