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Author Topic: What is the largest screen possible with today's lamphous and 35 mm technology? John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 10-08-2003 01:01 PM                        quote: Often more light shows off strobing more readily Yes, the eye's peripheral vision is more sensitive to strobing and flicker (a holdover from caveman days when survival depended on seeing a predator sneaking up on you from the side). And flicker is more apparent at higher light levels. As I noted, a lower light level for 70mm special venue theatres where the image fills the field of vision may be a special case. But for large 35mm images, you don't normally sit that close to the screen, and the prints are optimized for the SMPTE aim of 16 footlamberts.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 10-12-2003 11:52 PM                     For the record...I would nearly completely discount Aaron's concern about distance and light having ANY relation to each other. You will find, actually, that the shorter focal lengths are generally FASTER than the others though as others have pointed out...as you get to the extremely short focal lengths, the better ones are slower with f-numbers increasing above 2.0. However, there are special lenses not widely known to the run-of-the-mill cinema installers by both ISCO and Schneider that will get you down to 19mm without vignetting or light issues. ISCO has an attachment with a .52X magnification that will allow you to keep a fast f-rating, and excellent picture properties...it is available for nealy flat screens or curved. If you are going to do a BIG screen...by all means CURVE it and don't do it willy-nilly...ray-tracing is the only good way. You'd be amazed at the improvement in light. I am in the camp that larger screens need less light to look as good as small screens. Through personal observation (not scientific), a screening room screen in the 10-foot tall and less looks almost dim at 16-fL but a huge Cinerama type screen with a 74-foot arc looks great at 12-fL John P could successfully argue that in both cases the film was timed for 16-fL and you will only get the proper "dynamic range" from the film if you show at proper light levels. Steve  |  IP: Logged

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