Is focus accuracy checked as part of a CLA? I seem to get more out of
focus shots with one of my OM bodies more than the others.
Frank
On Thu, 24 Jan 2002 12:35:39 -0500 Joe Gwinn <joegwinn@xxxxxxxxxxxx>
writes:
> Ian,
>
> At 4:31 PM +0000 1/24/02, olympus-digest wrote:
> >Date: Thu, 24 Jan 2002 09:31:11 +0000 (GMT)
> >From: "Ian A. Nichols" <I.A.Nichols@xxxxxxxxxxxxx>
> >Subject: [OM] Checking Focus accuracy, was: OM lens fascination 1
> >
> > > One can test this at home:
> > >
> > > 1. Buy a small piece of thin finely-frosted ground glass. I
> got mine
> > > by mail order from Edmund Scientific
> > > (<http://www.scientificsonline.com/Scientifics/>) some years
> ago.
> > > Using a glass cutter and steel ruler, cut the glass into a strip
> 35mm
> > > wide and perhaps 70mm long. With 220-grit wet-dry sandpaper
> face up
> > > and wetted on a large sheet of glass, grind the cut edges of
> the
> > > ground glass straight, and smooth any sharp edges or corners
> off.
> >
> >Or you can just use that spare 1-13 focus screen. Or any other
> focus
> >screen. Just fix it in place over the film gate, matte side
> towards the
> >lens. You'll have to turn it slightly diagonally so the corners
> rest on
> >the inner film rails and hold it in place with rubber bands and
> >something to pad out the space between the bands and the screen.
> >
> >I've used this method successfully to check & adjust the
> rangefinder on
> >my 35RD and it should work with an OM too.
>
> I don't see why this wouldn't work either, although I would be
> afraid of damaging the focus screen, which is made of plastic
> (polystyrene?) and thus has delicate surfaces. If one has a beater
> screen, then no problem. The ground glass I used cost something
> loke $5.00 for a 6x6" piece ten years ago.
>
> Joe Gwinn
>
>
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