Originally Posted by dave in gva
This is mostly a question for JVC DLA owners out there with lens memory setups.
We're renovating the basement and my home theater is changing rooms.
The new room is almost square and my main concern is it will be a relatively short throw for my JVC DLA-X35 projector.
Here's the beef:
Room dimensions: 370 cm in projector throw axis, 360 cm wide. Black projection wall, dark colours elsewhere, no ambient light other than screen.
Projector: DLA-X35 (note this projector has a motorized lens with 5 user programmable lens memory settings for 5 combinations of a specific focus, zoom, and vertical/horizontal shift)
Throw distance: 312 cm (that is the maximum I can go - it leaves only 10 cm behind the projector to the back wall where the cold air intakes are and the manual specifies 20 cm)
Viewing distance: 308 cm
For what its worth, as we are renovating at this point nothing is built into this space so I can wire in, install, anything I want. Above dimensions are projected internal after drywall and include the standoff distance of the screen surface from the projection wall.
At maximum zoom for a throw of 312 cm the various calculators (JVC, projector central, elite) tell me I can get between 223-229 cm projected image width.
What I am thinking will be best here is a CIW set up and projecting a 220 cm wide image for all aspect ratios. I'll use a masking solution to close down or open up the screen along the vertical dimension.
My feeling is this will work best in my situation because:
This will give me the biggest projected image for all ARs without resorting to an anamorphic lens (2 m2 for 2.4 material and 2.7 m2 for 1.78)
I will certainly not have a problem with too little brightness even at close to maximum zoom - in this dark room if anything I may have to consider a screen gain lower than 1.0
The 5 programmable settings of zoom, focus, and vertical/horizontal shift should allow me to easily switch between 5 main AR projection requirements
I know a majority of people seem to be fans of CIH setups but I think at least 3 factors specific to my case make and the X35 make a CIW setup more appropriate: the lens memory feature of the X35, the short throw, and my desire to have as big and immersive a picture as possible.
I'd appreciate comments to either reassure me it makes more sense for my situation or point out if there is something I am overlooking. For what its worth I don't give much credence to the view that a cinemascope picture should be "bigger" than 1.78 material. I only watch one film at a given sitting anyway, so the argument that there is an "oooh aaah" factor from seeing the masking panels on the sides pull outwards for 2.4 material doesn't sway me. I simply want to project cinema material in the aspect ratio it was filmed in and use all of my projector panels to their full capacity in a relatively short throw room.