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Author
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Topic: Constant Image Height - adjustable side masking
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Paul Adsett
Film God
Posts: 5003
From: USA
Registered: Jun 2003
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posted January 16, 2017 10:14 AM
Stuart, you may want to take a look at my CIH set up, which uses two motors, one for the curtains, and one for the side masking. It's simple ,cheap, and works extremely well. All described in this video:
https://www.youtube.com/watch?v=Vo6rAuL4VXc
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The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj
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Evan Samaras
Jedi Master Film Handler
Posts: 513
From: Queens, NY, USA
Registered: Oct 2015
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posted January 16, 2017 01:57 PM
That's a great set up Paul!
If only I had the room.
I went a little crude with my design. I built the frame from studs, and then connected two standing projector screens to the sides, vertically. They cost me about $20 each. If I recall correctly, they were 40x40 or 50x50. I took apart the projector screens and removed the screen, replacing it with velvet material. I put them back together and had my spring tension for each side. At the end of the velvet is the thinnest piece of wood running from top to bottom, to keep the end straight, and with countersunk magnets attached. From there I carefully placed the opposing countersunk magnets in the correct ratio positions on the studs. I have to move each side one at a time, but it works for me, and didn't cost me much.
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...When there's no more room in hell, the dead will walk the Earth...
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Paul Adsett
Film God
Posts: 5003
From: USA
Registered: Jun 2003
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posted January 16, 2017 04:29 PM
Stuart, the moveable masking panels are about 1.25ins in front of the screen surface. I have fixed side masking for 2.35, so when showing a 2.35 movie, the moveable masking panels are actually powered out a little wider than 2.35, uncovering the fixed side panels. This enables me to set the motor stop for 4:3 films very accurately and just have an approximate setting for the 2.35 stop, since the motor stops can only be set in steps of about 2.0 ins.
I also have a third masking panel which rolls down from the top of the screen to mask off the occasional 2.55 CinemaScope films, and the even wider Technirama films. So I can mask just about any film format if necessary.
One thing that really helps in all this, is having a digital projector with programmable lens memory. My Panasonic AE4000 can be programmed for 6 aspect ratios, for picture size, picture vertical and horizontal position, and focus, so you can switch between academy, widescreen and scope etc, all at the push of a button. If you are in the market for a digital projector I would really recommend that you get this feature, which is not offered on all projectors. It makes a huge difference.
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The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj
| IP: Logged
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