Projector & Screen Height

I would appreciate some help with regards the correct height of my projector to the screen. Being a complete novice and now in the middle of decorating, I want to get it right so I can finish my decorating (and conceal most of the cables).

I am mounting the pj on a ceiling mount, and the lens will be about 7'9" high. The bottom of the 6' wide screen will be about 30" from the floor, so my question is, will this be okay without getting any keystone effect (from what I have read on this forum it is advisable not to use the keystone adjustment).

Having done the calculations for my benq 5120 (using the USA site), I am positioning the pj 3.24m from the screen, to obtain a screen width of 170cm, a height of 96cm & a diag size of 195cm.

From what I have described, will I have any keystone effect and do my calculations sound right (eye to screen distance will be about 10')?

Any comments will be appreciated, as I really must get this resolved so I can finish the decorating (and hopefully enjoy my pj).


Novice Member
Wow! What a coincidence. You're going through the exact same thing as me - decorating then putting up a 5120 and 6' screen.
Would be interested in any replies also as my set up is going to be practically the same.


Distinguished Member
I think you are best projecting the image onto the wall before you can be certain, all the calculations under the sun won't guarantee you'll be spot on.

Of course this is where PJ's with optical lens shift really come into their own!...PJ


Active Member
The ideal is that your eyes should be level with a line drawn 1/3 distance up the screen when sat in your usual viewing position.

The latest video from AVForums

AVForums Movies Podcast: Streaming Theatrical Releases And The Future Of Cinema
Subscribe to our YouTube channel
Support AVForums with Patreon

Top Bottom