Projector Mini-Shootout Thread - Page 463 - AVS Forum | Home Theater Discussions And Reviews
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post #13861 of 13864 Old Yesterday, 08:13 PM
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Originally Posted by Mike Garrett View Post
With an A-lens, I would only use a gear adjustable mount. It makes setup so much easier and more precise.
With my RS4910 I had used a Chief RPM mount but still found that due to excessive ceiling joist vibration (washer/dryer located on same upper floor) it would not hold a constant alignment. Any recommendation for a firmer geared mount?

In either case, I need to work on stiffening the ceiling joists with a strongback and/or use a vibration reducing mount like the Nigel B Design's.
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post #13862 of 13864 Old Yesterday, 09:03 PM
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Originally Posted by Mike Garrett View Post
I don't understand this. I use a ceiling mount and an A-lens. Used to use a shelf mount for both projector and A-lens. A ceiling mount is so much easier. With the lens out of the light path, you adjust the projector to fit the screen for height, centered horizontally and to provide an image without keystone. Once you do that, you are done adjusting the projector and now just time to adjust the A-lens. Then you slide the lens in place and adjust the A-lens. Any adjustment to the A-lens does not affect the image setup of the projector without the A-lens in place. The lens and projector setup is independent of each other. Now, you can't go back and adjust the projector after adjusting the A-lens, but that messes up any A-lens setup, even if the A-lens and projector are completely separate.

Are you using a projector mount with gear adjustment or one that only uses friction screws to hold everything in place. With an A-lens, I would only use a gear adjustable mount. It makes setup so much easier and more precise.
Not all A lens mounts are independent of the proj ceiling mount. Of course yours being independent will be easier.
But things move on the ceiling especially if you have a room upstairs above the mount, ceiling timbers also move with heat and cold from the roof. If one is not overly fussy like I am about my image being masked perfectly up to the millimetre its all ok.


There is nothing in my setup that can move due to room, ceiling temperatures, its all built in like kitchen cabinets.


I have seen and heard of many complaining about ceiling mounts moving over the years, but there are ceiling mounts and ceiling mounts. The $45.00 ones are pretty useless. Mind you I had an expensive chief and a custom build A lens mount attached to it, the whole thing cost a fortune and looked beautiful, it still moved and drove me nuts!


To the other part of your question, I don't use a ceiling mount, you must have mis read my post.

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post #13863 of 13864 Old Yesterday, 09:09 PM
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Originally Posted by jjcook View Post
With my RS4910 I had used a Chief RPM mount but still found that due to excessive ceiling joist vibration (washer/dryer located on same upper floor) it would not hold a constant alignment. Any recommendation for a firmer geared mount?

In either case, I need to work on stiffening the ceiling joists with a strongback and/or use a vibration reducing mount like the Nigel B Design's.

Bingo this always happens, that's why I stopped using ceiling mounts. A shelf cant move and its fixed at many points, not just a pivot as most mounts are. I've been selling ceiling mounts for years, expensive ones, cheap ones, if the ceiling its mounted on has an upstairs, things constantly move. I always had customers asking why does their image keep going slightly out of alignment, even in the days before we had zoom memory. When I told them to shelf mount, they stopped complaining....


Maybe the houses in the USA don't move

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post #13864 of 13864 Old Today, 05:42 AM
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Someone asked about using Horizontal lens shift on the 2:35:1 forum and a person associated with Panamorph said that at least if someone is using a Panamorph A-lens "Vertical is fine, horizontal lens shift will seriously affect your image geometry." So that spooked me.
This is specifically in relation to the anamorphic lens. Consider pincushion, if everything is setup normal to the screen, you get an even amount of pincushion on each side. No imagine if you shoot light through diagonally (using horizontal shift) now you'll have an uneven amount of pincushion.

See what an anamorphoscopic lens can do, see movies the way they were meant to be seen
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