Anybody know the thread size of the JVC RS1 lens?
Looking to add a Hoya ND2 1 f-stop neutral density filter for the first 800 hours
of lamp life on a Da-Lite HighPower, 2.35:1 setup.
The RS1 projector will be mounted around +25 degrees vertical offset (about 4.5 degrees angle above screen centerline) and the optimum seating position places the viewers eyes about 5 degrees angle below centerline.
This places the best seat within 9.5 degree cone, which will yield a gain of at least 2 up to 2.2.
The screen is 52" by 122" 2.35:1 (area of 44 square feet) squeezed by VC anamorphic lens and with a 20' 5" throw, equates to a TR of 2, near the middle of the zoom range but closer to the brighter but lower contrast end of the lens' zoom range.
With a new lamp on normal setting, calibrated to D6500, the reported lumens is around 562 L
562/44= 12.7 f.l. times 2.2 gives around 28 f.l. and 14 f.l. when the lamp drops to 50% brightness
I know some may reason that brightness level would be fine but I am aiming for movie theater, not TV brightness levels.
Trying to equalize the perceived brightness over the lamp life by cutting down the first 400 to 800 hours out of 2000.
Thanks in advance!