Originally Posted by drriddhish
Now the recommended viewing angle is 36 to 46, so does it not bother you that much if you have viewing angle of >46, especially in 2.35:1 format. I was told that It will make very hard to encompass whole picture without moving your eyes side to side. Thanks
As Mark said, the 36 degree viewing angle is the recommended viewing angle for the back
row of a THX certified theatre. At home they recommend 40 degrees for 16:9 with good HD material, which equates to 52 degrees for scope in the same seat with a scope screen of the same height (and ideally using an A lens so the pixel density is the same).
Seating distance is also related to in terms of screen height ratios, and the older recommendation of sitting at a ratio of 3 x the screen height stems from the crossover point where the reduction of the image quality of film may start to become visible (grain, scratches, dirt, projector mechanics), verses the need for immersion (more is usually considered better). With high quality HD material the SH to seating ratio can be moved closer to 2.4 x SH (THXs 40 degrees as mentioned before).
As for sitting too close, we have a binocular field of view of 120 degrees, so sitting at 60 degrees isn't too close and you won't get a great deal of eye movement. You may however, start to see pixels or source material issues if they're there. Vertical viewing angle is where most discomfort can occur (looking up for long periods), so make sure your screen isn't too high (eyes falling around a third of the way up the screen).
Seating distance is just a recommendation, so sit where you feel most comfortable (experiment by projecting onto a wall and see how close you can sit to achieve what feels best to you). With 1080 material, you can sit in the same range as in a commercial theatre (2 to 4 x SH puts you in the average range of seats) so if you tend to sit in the centre of a theatre, that would be around 2.4 x SH. If you sit a bit further back, 3 x may be better.