I have checked over 15 OM bodies, besides two need focus adjustment,
all others were very accurate. I tested them by putting a focusing
screen on the two inner rail no additional film as spacer. Same
adjustment used all 35RD adjustment, didn't found any problem wide
open yet.
C.H.Ling
Thomas Bryhn wrote:
>
> At 16:47 03.04.01 +0100, Ian A. Nichols wrote:
>
> >....Camera on tripod pointing at subject with vertical lines, back open,
> >focusing screen (I used one from a dead Pentax ME super because I happen
> >to have one, it's a bit smaller than Oly screens and less likely to
> >result in damage to one of my Oly screens if the cat knocks the whole
> >thing over) strapped gently across the film rails with rubber bands.
>
> I want to add that the photographic emulsion is in fact at the back of the
> film, so it would be even more accurate to have pieces of film between the
> screen and the film rails. Probably not an issue with 35RC and other
> cameras with slower lenses, but it *could* be a significant error when
> close focusing with RD and SP wide open.
>
> BTW, the same goes for knife edge focusing in astro photography, wich was
> mentioned here the other day: Always account for film thickness!
>
> Regards,
> Thomas Bryhn
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