I am looking at buying a projector to use at home to watch tv and dvd's. I have read up on the various issues involved but i have been unable to find anything about what angle projectors will work at, i.e. I would like to put the projector on top of a tall cabinet in the corner of the living room approx 4 metres away from the wall. the angle from the where the cabinet is ti the wall is approximately 30 degrees. will this work?
Some projectors have what is known as lense shift. this will move the image up and down within a certain range without tilting the projector. you also get horizontal lense shift which is left to right.
Normaly the PJ will need to be within the screen area ie level from top to level from bottom. Unless it has a fixed offset. try to centre the PJ lense to the centre (ie centre from left to right at the height you need) of the screen if possible, if you cant a PJ with horizontal lense shift might help, but dont go too mad, its really for small adjustments.
ceiling hanging is also an option
Some projectors have a 'fixed offset' which means installion has to be just right as there is no range to move the image up or down and tilting will make the image go out of square.
Bottom line is getting a PJ with lens shift makes it easier to install.
the other thing to watch out for is the 'throw' of a projector.
some have a short, medium or long throw. This means a short throw projector needs to be close to the screen to work.
a long throw projector goes right at the back of the room. (this is dependent on the room size as a small room could have a small throw projector on the back wall, but definately not a long throw projector.
as an example see this projector here
this is a calculater that will let you work out if the projector will fit your room and screen size.
So enter your distance from screen to the lense (allow for the lengh of the projector in your overall room length. In the throw range box click the diagonal range box, this will give you the max and min zoom the PJ will do from your givin distance. Now you will know what screen size you can have etc.
In your case you will most likly need a PJ with lense shift, so look for a PJ with a good range lense shift and you should be set.
I hope i understood your post, but without a sort of image to look at im guessing a bit what you mean. but the lense will need to look direcrlty at the screen with no angle there.