Re: [OM] OM-1 cleaning information requested / Gunk in viewfinder

[Lex Jenkins]

That's pretty much what I figured.  Definitely not a job for a tinkerer, 
unless one is satisfied with nearly-in-focus images.
I've already noticed minor differences in focusing accuracy between other 
camera bodies using the same lenses, probably due to age-induced variations 
between those elements you listed.
Thanks for the info, John.

Lex

> From: "John Hermanson" <omtech@xxxxxxxxx>
>
> The pentaprism sits in a frame, which rests inside the main body casting.
> Between this frame and the main body casting are spacers which raise and
> lower the focus screen position.  AFter screen focus is set, mirror angle
> must be reset, then  screen focus rechecked against flange- back distance.
> None of this can be (accurately) done by eye or with newspaper taped to a
> wall.
>
> John  Hermanson
> ___________________________________
> Camtech, Olympus Service since 1977.
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> ___________________________________
> ----- Original Message -----
> From: Lex Jenkins <lexjenkins@xxxxxxxxxxx>
> To: <olympus@xxxxxxxxxxxxxxx>
> Sent: Friday, July 07, 2000 1:21 PM
> Subject: Re: [OM] OM-1 cleaning information requested / Gunk in viewfinder
>
>
> | I'm not sure how these items would be adjusted, but positioning of the
> | flip-up mirror, focusing screen and pentaprism all affect focusing
> accuracy.
> |   I've read articles about this from other photographers more 
> technicially
> | proficient than I.  Makes sense.  Perhaps shims or other methods are used
> to
> | make these adjustments.  We know that the position of the flip-up mirror
> in
> | the down position is critical to focusing.  What if the material that 
> pads
> | the mirror on the return trip shrinks with age?  Might result in
> incremental
> | changes in focusing accuracy.
> |
> | As a former target shooter I do know there are lots of tricks for
> improving
> | accuracy in firearms that no manufacturer would divulge or approve of.
> |
> | Lex
> |
> | >From: "Dirk Wright" <wright@xxxxxxxxxxxx>
> | >
> | > >John, wouldn't pentaprism replacement be a pro job, since it affects
> | > >focusing accuracy?  It doesn't sound like a drop-in job.
> | > >
> | > >Lex
> | >
> | >I didn't see any way of adjusting the prism when I had mine apart, so I
> | >would assume that you could reasonably just swap a good one for a bad
> | >one.
> |
> | ______________________________________________________________________
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