what size?


Active Member
just a quick question, what size of screen (16:9) would you install if you were sitting 4.5m away? I'm between 3 & 2. 5m widths. What's you suggetions?
Thanks, marc


Active Member
4.5 metres is approx 14 feet,

what is the distance betwen the front of the lens of the projector to where your screen is going to be ?

just measure that distance and divide by 1.5

i have an 8 ft dual masked screen and it is 12 feet from lens to centre of screen, so you have more than enough space for an 8 ft screen.
I have based this calculation on the assumption you have a crt,

Peter Parker

Distinguished Member
If you have digital, then sitting two times screen width away may be more prudent, depending on resolution.

If it's an xga or higher res digital, then 1.85 should be OK. Any closer and you may see screendoor (the gaps between pixels). This is more evident with LCD than DLP.

I belive the SMPT recommendation is around two times screen width and 30 degree viewing angle. THX has a similar spec IIRC.



Active Member
Thanks for your replies, but I wasn't really asking about the projector restrictions of size, i was more interested if you were sitting 4.5m (14.7 ft) away how large would you like the screen. Another way of asking it is whats your prefered angle of view?

At the cinema some people like sitting right at the front and others all the way at the back and most somewhere in the middle.

Gary, whats SMPT ?


Peter Parker

Distinguished Member
Sorry, that should have read 'SMPTE' which is The Standard of Motion Picture and Television Engineers.

At the cinema, I sit in the middle, at home, I sit at about 1.85 (12.5ft) screen width (7ft) from my screen.

HTH (Hope That Helps). :)



Active Member
The minimum angle of view for a THX cinema is 26 degrees for the farthest seat with 36 degrees recommended. I just worked my angle out at 31 degrees which I feel is too narrow, the screen seems distant and not immersive enough. The problem is if I sit too close I get the screendoor effect of the PJ.

You also want the bottom of the screen to be below eye height if possible it makes a huge difference IMO.

Peter Parker

Distinguished Member
Good point Mat,

I find that having to look up at a screen too much makes me feel uncomfortable. I sit with my eyes about a third up from the bottom of the screen, and that feels very comfortable. I may consider lowering the screen a little to improve this further, but my subs and center sit under the screen so I could only do this by a few inches at most.

Here's a link that might be useful regarding distances and viewing angles for those who might be interested:



dr no

I have just joined the projector scene.

I sit 12 feet from an 8 feet screen. It is barely enough. A few couple more feet would have been better but not everyone is fortunate enough to have a choice.

But re: angle - I find the best position is to be somewhere quite close to the midscreen height from sitting position.

It is SOOOOO much more comfortable.

Looking up I find is quite difficult for long periods of time.

In Cinemas I aslo sit in the middle. Anywhere else I find uncomfortable.

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