AVS Special Member
Join Date: May 2000
Location: Walnut, CA, USA
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W1070 cih 2.40:1
So ... tonight I dug out the wedge prisms I bought 7 years ago from a group in France that had a limited run made. I bought them, but then never did anything with them because I had no good way to do vertical scaling with my JVC RS1 projector.
Of course, the W1070 "Letterbox" mode of "Aspect" ratio control does the vertical stretch needed to use an anamorphic lens. I could have sworn someone said the short throw of the W1070 and its recessed lens would make use of an anamorphic lens unworkable. I am happy to report THIS IS NOT TRUE. It may not work with the "trophy" prisms because the size and shape of those is different, but these French prisms work fine with the W1070.
I simply placed the prisms at angles in front of the lens and it worked like a charm. It took me all of 2 minutes to find the correct angles. Of course, it all needs to be setup inside a black velvet lined box to contain the reflections, but that should be a piece of cake. And of course a sled to move it away when watching 16:9 content. But simpler than the moveable mount I was planning on needing to use the "zoom method" for constant image height on 2.40:1 screen.
I was concerned about the chromatic aberrations of a simple two prism A-lens, and they are pretty bad on the test pattern, but unobjectionable when watching a movie. There is about an inch of bow across the top (what would be the bottom when ceiling mounted), so I can see why people go for a curved screen to counter this.
Here is a shot of the prisms setup in front of the projector and some shots from X-Men Days of Future Past using the full 1080 pixel height of the W1070.
JVC DLA-RS1 VuTec 122" Screen
Harmon Kardon AVR 247 Parasound L&R Amp
Psycoustic Mark III L&R Towers, Boston Center
Energy Take 5 Surrounds, HSU Research Sub
Last edited by dreamer; Today at 12:08 AM.