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Re: [OM] Misc ramblings in regard to 85 f2 focus

Subject: Re: [OM] Misc ramblings in regard to 85 f2 focus
From: John Hermanson <omtech@xxxxxxxxx>
Date: Thu, 24 Sep 1998 16:10:17 -0400
This can be the tip-off to a mis aligned mirror: sharp in the finder but out of
focus on the negative.

John

Chris Barker wrote:

> >Regarding miscellanious issues here is something I found out about my 85
> >f2. I took it to a Giants ball game where we had nose bleed seats -- one
> >row from the very top. I wanted to use my 85 instead of the 50 f1.8 because
> >I "see" more like  the 85. It was a bright, cloudless day and so very
> >constrasty which makes focusing easy. I noticed with one lens(the 300mm
> >f4.5) that infinity focus on the barrel is too far, i.e. out of focus. Now,
> >I have learned from this august mailing list that this is not uncommon with
> >long telephotos. But when I tried the 85 I was surprised!
> >
> >I couldn't turn the focusing ring far enough to get sharp(in focus) focus
> >at infinity. I was using a screen with a split screen and could see that
> >the image was not comletely lined up. And the image was ever so slightly
> >fuzzy.
> ...
> >Andre
> >San Carlos, CA
> >USA
>
> Andre,
>
> Does this happen with any other lens?  When I noticed this, mostly with the
> 50/1.4 on my OM1N, I suspected the camera mirror for months (of course my
> OM4 has built-in correction).  Eventually, after many rolls with some
> strangely unfocused photos, I was told at my annual medical that I had
> astigmatism in my right eye.
>
> I now wear spectacles and the problem is no more (or I use an eyecup with a
> correction lens installed).
>
> BTW, the OM Handbook states specifically that the 300/4.5 has a buffer at
> the infinity end to allow for temperature changes, so you may reach
> infinity before you get to the end.
>
> Hope that this helps
>
> Chris
>
> ____________________________________
> Chris Barker <><        mailto:cmib@xxxxxxxxxxx
> ~~~~~~~~~~~~~~~
>
>




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