P3D Re 1.2mm maximum OFD out of the Window?

[Peter Homer <P.J.Homer@xxxxxxxxxxxxx>]

Paul Talbot wrote in reply to Bruce Springsteen the "Unbosses " post


>> Is there a way to eyeball shift through the finder that will keep
>> to commonly accepted maximum deviations?

>I remember this being discussed on the list some time ago.  I think
>someone even suggested scribing marks on the focus screen to serve
>as a guide.  My recollection was that lines 1.2 mm apart would be
>appropriate.  Unfortunately I don't recall whether someone shot down
>this proposal in a later reply.  Losing my memory from old-timers
>disease, I guess.

I remember that post as well and I think someone suggested cutting a scale
from the mounting gauges supplied by Reel 3D instead  of risking the
focussing screen. Or perhaps it was my own idea , anyway I cut one end off
the full frame 35mm gauge as I was going to use it in my full frame Miranda
Sensormat which has a removeable pentaprism. This gauge actualy has a
maximum OFD of 1.5mm as well as 1mm and 0.5 mm for large scale projections
. As my home projection using my Fed with 80mm lenses would I thought be
quite a modest size I decided to use the  1.5mm for hypers taken from Fjord
ferries in Norway. The results were quite good
but the seperation is perhaps a little excessive maybe I should have used a
5 or 7 perf gauge with 1.2mm OFD or even the 1mm or 0.5 mm of the gauge I
was using.
 I dont understand why they use 1.5mm for the ful frame 8 perf gauge is it
because of the extra width ? . Then why do the 7 and 5 perf gauges with 2
perf difference as opposed to just 1 both use 1.2mm and only differ in
their centres.

                                                                   P.J.Homer




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