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Topic: My scope "King and I" has 2.85 aspect ratio, is this correct?
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David M. Ballew
Expert Film Handler
Posts: 113
From: Burbank, CA USA
Registered: Nov 2009
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posted October 11, 2012 02:37 PM
Winbert, I would suggest three further tests.
First, project the ‘Scope print at a closer throw—that is, with the projector and screen much closer together and a much smaller overall picture size. Measure that picture and calculate that aspect ratio. If there is a discrepancy, it may mean that your anamorphic lens “unsqueezes” the picture at different proportions depending on the throw distance or the focus setting.
(By “focus setting,” I mean the focus on the anamorph itself, not the spherical lens built into the projector.)
Second, try changing the distance between the rear element of the anamorph and the front element of your spherical lens, being very careful of course not to scratch or damage any glass in the process. The size of this gap can sometimes affect compression ratios for anamorphic lenses. (I realize this test may not be possible if your anamorph is directly mounted on the projector, but off the top of my head I don’t recall what setup you use for your presentations.)
Third, project a non-anamorphic print using only the spherical lens on the projector. Measure that picture and calculate that aspect ratio. It may be that the aperture in your projector is not precisely 1.37:1 (or 1.33:1, or whatever), although I very much doubt this will turn out to be the case.
Nice, bright picture you’re getting, though, no doubt about that. And let me please add that your contributions to this forum are one major reason it is such a fun and useful resource. Thank you for being you, Winbert! [ October 12, 2012, 08:58 PM: Message edited by: David M. Ballew ]
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