[MF3D.FORUM:1547] Re: On Film Deviation

[Paul Talbot <ptww@xxxxxxxxx>]

Dale wrote:
> 
> Thinking of Richard's proposal, I was looking at Gepe glass mounts in
> 6x6 and 6x4.5 today.

What proposal is that, Dale?  (Shows for Buffalo, perhaps?)

> Not wanting to start any calcultor wars, but as
> 1.2 mm is a good approximate on film deviation for 35 mm., what would be
> an approximate MOFD for medium format projection?  Is 2 mm a good
> start?

Most people find 2mm a bit conservative for 6x6.  The guideline
is based on viewer FL/30.  For an 80mm viewer lens, that would be
80/30 ==> 2.67mm.  (1.2mm actually understates this guideline for
most Realist format viewers.)

> Thinking also of making a registration guide for 6x6 on acetate.

As in an alignment gauge?  As part of the RMM ownership change, I
received from Joel a file for printing a gauge on a computer printer.
I have some duplicated on overhead transparency film, and include
them for free on request with mount orders.  I always figured that
everyone into MF stereo and using Joel's mounts before the RMM
ownership change already had at least one of these.

Paul Talbot