[MF3D.FORUM:573] Re: MF Viewer interoculars

[Alan Lewis <3-d@xxxxxxxx>]

Greg Erker wrote:
> 
> >I always use the centerline spacing on the MF mounts that
> >I have. I suppose an alternative would be some average
> >interocular spacing or an exact match for your personal
> >spacing. I don't know how either of these second two
> >would be affected by the centers on the mounts.
> 
>   That means that the window (mount edges) and
> the nearest objects are viewed parallel. And
> further objects and infinity require some
> diverging of your eyes.
> 
>   On my viewer I put the lenses slightly further
> apart than infinity spacing (66mm I think) based
> on John B's wisdom.

Yes, that sounds good too.  I set the lens centerline on my production
viewers to exactly match the infinity separation of the alignment gauge
that RMM offers. 
 
If you make a "one off" viewer for personal use you can choose whatever
centerline works for you, but since I have to make a more universal
production viewer I had to make a choice.  Something that would work in
all cases.

The choice I made was to design the viewer around a standard based upon
the alignment guage.  As long as the viewer mounts using a guage then
not only will all the slides be easy to view, but the need to keep
fooling with the focus will be reduced.

I feel that at the minimum the lens centerline should always be greater
than the mount aperture centerline.  

-- 
Alan Lewis  
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