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RE: [OM] Infinity Focus problem - 55mm f1.2

Subject: RE: [OM] Infinity Focus problem - 55mm f1.2
From: "C.H.Ling-Accura" <chling@xxxxxxxxxxxxx>
Date: Fri, 11 Jul 2003 09:27:00 +0800
For focus checking on camera body I'd recommend to make with close object,
at infinity you have no room to move (focusing ring) so you will no know if
the sharpest focus is achieved or not. A short procedure is at below:

http://www.accura.com.hk/OM/focus.htm

C.H.Ling

> -----Original Message-----
>
> There is a direct test as well.
>
> 1.  Put the camera on a tripod and take the back off the body.
> Tape a piece of thin frosted glass down in place of the film,
> frosted side towards the lens.  Set lens wide enough to make
> focusing critical, to f/1.2 or f/2.
>
> 2.  Focus on distant trees using the viewfinder.   Mark the
> location.  This is most accurately done by putting a piece of
> white paper sticky tape on the lens barrel and marking the
> position of something on the focus ring on the white tape.  (Tape
> adhesive can be removed using a Q-tip dampened with lighter fluid.)
>
> 3.  Using a lockable shutter release, put the camera in B shutter
> mode, leaving the mirror up and the shutter open.
>
> 4.  Then, using a hand magnifier as an aid, see if the image on
> the ground glass is in focus.  If you have the readjust the lens
> to achieve best focus, the camera body is out of adjustment.  In
> particular, the mirror or focus screen isn't where it should be.
> Fixing this often requires a CLA.
>
> Joe Gwinn


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