Re: [Leica] Hey Walt! Rangefinder Check?

[Walter S Delesandri <walt@jove.acs.unt.edu>]

That's what I've done for years....be sure to check at infinity and close 
up, it's possible to have the near-focus compensation (set by the "length" 
of the cam arm) off, and still have reasonable accuracy at 10-15 feet....
I usually used to check at 15-25 feet, at about 30", and then just visually 
check the infinity....should all be close....as has been stated by Erwin and 
others, the RF on these cameras is probably overkill for 50 and shorter, but 
it can make a difference with a 90 at f2.

Walt


On Tue, 07 Nov 2000 20:24:25 +1100 Rick Dykstra 
<rdandcb@cybermac.com.au> wrote:
> Hey Walt!  Can you comment on this little method I've tried for checking the
> accuracy of my M6 rangefinder?
> 
> I take the camera back off, replace the bottom and mount the camera on a
> tripod, put on a 90mm lens and point it at the ground from a bit over a
> meter up.
> 
> I lay a ground glass screen flat upon on the film guides (the inner one of
> the two at the bottom).  Yes, it's a bit fiddly to do.
> 
> I lock the shutter open with a cable release.
> 
> Then, I focus on something like a barcode laying on the floor and check the
> focus on the ground glass with a magnifier (lens wide open).
> 
> So Walt (or others), should this work or is the ground glass not in the
> right position?  Any help would be appreciated.
> 
> Thanks!
> 
> Rick Dykstra
>