Re: 70mm IR

[Don Roberts <droberts@xxxxxxxxxxxxx>]

Willem-Jan Markerink wrote:

> On  3 May 99 at 8:04, Tim Breen wrote:
>
> > Willem-Jan,
> >
> > A question: when shooting 70mm w/Bronica, is filtering on the lens the only
> > option? I know almost nothing about medium format but am beginning to look
> > at it pretty seriously.
> >
> > Thanks!
>
> Together with a list member, I recently did some research on a
> BTFR-related solution for the Bronica 70mm back (the one I had for
> sale is sold btw, and I am still not sure whether I can locate a
> second, as mentioned before).
> At first I thought a larger filter might fit between body & back,
> inside the square ridge on the outside of the back, but I was told
> those two surfaces have a too close fit already (so the 0.4mm #87C
> won't work, but the 0.1mm #87 might).
> It seems there might also be room for a true BTFR-version, but again
> only the 0.1mm #87.
> Not sure about mounting a filter in the camera, behind the mirror, as
> I don't have a Bronica ETRS body to check that....
> [this is actually the original solution as written by Andy Davidhazy
> in a PhotoForum text file, which later resulted in the BTFR-version]
>

I have been using both the 70mm and 35W ETRSi mags for a year with Lee polyester
#25 filters taped to the front of the magazine openings.  You have to make sure
the backs latch but I have had no problem otherwise.
I made clear rigid plastic covers for the front of the mags to insure that the
filters don't get scratched.  I see no reason that #87 shouldn't work.

==========================================================
  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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