Re: EMDE medium masks

[P3D emdesher <emdesher@xxxxxxxxxxxxxxxxxxxx>]

On Sat, 28 Sep 1996 P3D.Carrano@xxxxxxxxxxxxxxx wrote:

> Dennis Sherwood writes on the introduction of a new design EMDE normal
> mask:
> 
> >If you have ever seen the EMDE 7-perf mask, the new normal mask film
> >holders would be of the same design.  It could be the best of the old:
> >foldover design, etc., with the freedom to fully adjust your film pair for
> >the best stereo window effect.  It would be priced far less than competing
> >Albion and RBT mounts.  Your comments are needed!  Dennis Sherwood 
> >emdesher@xxxxxxxxxxxx  or  847 872 9230
> 
> A couple of questions I would like to ask:  Does the above mean the new
> mask now has a channel with open ends (instead of the locking nibs) that
> the film fits into, allowing the film chips to slide left and right for
> adjustments?  If so, is it recommended to use tape to hold the film
> chips in place, such as is recommended for Albion masks, or does the
> foldover feature provide a snug enough fit, that tape is not necessary?
> 
> Allan Carrano  
> 
> 
Yes, the new design will allow the film pair to be adjusted horizontally 
without any restrictions.  Vertically, I have decided against allowing 
for play, thereby eliminating the necessity of having to tape down every 
film pair.  The foldover feature is to prevent the formation of Newton 
rings in glass mounted slides by sandwiching the film pair between foil.  
The aluminum foil physically prevents the film from touching the inner  
surface of the glass.  If a stereo pair needs vertical alignment, it's 
better and simpler to just trim them so the pictures are in perfect 
registration.  When the new nibs are gently pressed down, they will hold 
the film in place, without the need for tape. 
Dennis Sherwood


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