Originally Posted by wm
I suspect that you won't actually have 600 lumens with a CC filter no mater how you adjust - there is some loss in the filter. I've done quite a few of these...
Unless this projector is very different from previous JVC UHP, a magenta filter is probably going to be a better choice to improve contrast. However, with the contrast this projector already has, it's going to take an expensive filter, glass with good AR coatings, and even then I'm not sure what the impact will be on intra-scene contrast.
Yes, I suspect there will be some light loss in comparison with the normal setting.
I tried a spare CC040R with the calibrated setting and the image is too red.
I estimate it's more like CC015 or CC020.
I was assuming red and 600 lumens just as example.
The filter I get in the deal will be a glass filter. I do not know the actual color if it yet. The actual color filter needed depends on actual measurements taken from the projector itself.
Measured spectrum from Cine4Home review:
Indicates that magenta will be a better choice indeed.
See link for details about the filter used for C4H 'Innovative tuning'. (german)C4H tuning
According too this coated glass is used to improve light tranmission and reduce reflections.
I can see why people with bat caves and high gain screens can be bothered by the light spill during a total fade to black. The corners do stand out a little but the screen is lighting up a little too. An adjustable iris mechanism would have been most welcome to be able to trade in some of the brightness for a yet even better black level.
(This will also improve a little when the bulb ages a little)
I will experiment with controlled lighting at the sides of the screen to fool the eye into a better in screen contrast perception. (Just like Philips Amibilight does)
What I find strange that I can see a ***white*** ring or tube between the optic elements. Could that be causing the cornering?
My projector is at the ceiling and projecting downwards.
The lower corners stands out just a bit more when the lens is shifted down. To me it suggest that this white object could be the cause as the lightpath is travelling through the bottom half of the lens. At the dealer the lens shift was in neutral position and the cornering looked more even.