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Re: [OM] Checking Focus accuracy, was: OM lens fascination 1

Subject: Re: [OM] Checking Focus accuracy, was: OM lens fascination 1
From: frankrad4@xxxxxxxx
Date: Thu, 24 Jan 2002 12:53:12 -0500
   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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> 

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