Re: Bronica BTFR

[Don Roberts <droberts@xxxxxxxxxxxxx>]

Ron Aavang wrote:

> I looked at my Bronica this morning. For the 135W back, I believe I will
> mount my filter in the magazine housing under the 35mm film insert. It is
> spring loaded to the housing and has .047" (1.2mm) of spring play when
> installed in my magazine. That is plenty to accommodate a .1mm or .4mm
> filter thickness and it will be .080" (2mm) in front of the film platen.
> That will move the film plane back a little, but you need to extent the
> focus distance for IR anyway. For the 70mm magazine I haven't figured out
> anything better than Don's idea. The only other Idea I had there was to
> modify a dark slide, but I think the filter would get scratched when being
> inserted and removed. If I can find an extra dark slide, I might try it to
> see, or I might just make it from scratch. The dark slide is .013" (.3mm)
> thick, so a .1mm filter would fit, but a .4mm might be too thick.

Ron, I too thought about making a dark slide/filter for the 70mm magazine.
It occurred to me however that the light piping through the filter as you
inserted or withdrew it would probably ruin at least one or two frames each
time.  That and the probable scratching made me give that idea up.  I will
look into your idea for the 35W however.

==========================================================
  Don Roberts * Bittersweet Productions * Iowa City, IA
              *                         *
  It is better to know some of the questions than all of
  the answers.- Aldous Huxley
==========================================================


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