Originally Posted by Jason Turk
Good news. After more playing, with the iris engaged I got over 33000:1 contrast! Granted the light output dropped to just shy of 400 lumens, but still....quite impressive!
That is indeed impressive performance. Was that at max throw?
For those with screen sizes of 110" diag and below, 400 lumens is plenty IMO, especially if you have some gain such as 1.2 or 1.3.
I plan to run the RS20 at about 300 lumens on my 106" diag Firehawk, producing about 12fL, in order to eek out as much CR as possible, without trading too much brightness (though I may decide to go even lower like 200 lumens if it means 50,000+:1 CR...).
Years ago I would have instead chosen to max out brightness more - aiming for more like 20-25fL. But I've come to learn that is not necessary at all to enjoy my pj and I'd rather have the inky blacks.
For instance I am running at about 8.5fL (about 200 lumens) on my RS1 with aged bulb (about 1000 hours) and it still looks PLENTY bright. In fact the other night I was watching Sin City on Blu-ray and I thought to myself that portions of the movie looked too bright!
Bottom line is that I encourage people to aim for 12fL or perhaps lower, even if you can get a lot more out of it, and enjoy the best blacks possible. Then again I do my viewing is a pitch dark room so if you are watching with some ambient light then that's another story - but that's what the adjustable iris is for!