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Author Topic: Digital projector recommendations John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 08-28-2004 06:24 PM                        A neutral density filter is a gray filter that reduces the level of light. A ND of 0.30 density lets 1/2 (50%) of the light through, a ND of 0.60 lets only 1/4 (25%) of the light through, a ND of 1.00 lets only 1/10 (10%) of the light through. Kodak makes a line of neutral densities known as the Wratten 96 filters. They are designed to have very low light scatter, so they can be used in imaging systems (e.g., as a camera or projector filter).  |  IP: Logged Bryan Fournier Film Handler Posts: 61 From: Greensboro, NC Registered: Dec 1999 posted 08-28-2004 11:08 PM                     I can understand the need for one while using a camera, but while using a LCD/DLP projector couldn't one achieve similar results by lowering the brightness level via the projector settings?  |  IP: Logged Paul Mayer Oh get out of it Melvin, before it pulls you under! Posts: 3836 From: Albuquerque, NM Registered: Feb 2000 posted 08-28-2004 11:41 PM                        The problem is that these machines have high black levels to begin with--much higher than video black. If you try to reduce video black level via the brightness setting, all you end up doing is "crushing" the picture blacks below the black level of the projector itself, burying any details in the blacks. Using an ND at least lowers all levels together. The goal is to pick an ND that will give you good black levels for the lighting conditions in the room--as always the darker the room, the better. The whites will be pulled down too. Some projectors give you the option of cutting back on lamp power to reduce light output, which saves you from having to use an ND. The Sanyo's I've used have four lamps--you can pick how many of them you want to use. The new Sony machines do this too, plus have an iris fitted to further fine tune the light output. BTW the new Sony 2K and 4K SXRD imagers are LCOS devices that are reflective, operating much like D-ILAs. They should give better black performance than traditional LCD panels yet not look as "busy" as a DLP image.  |  IP: Logged John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 08-29-2004 11:33 AM                        Kodak Wratten 96 Neutral Density filters: http://www.kodak.com/US/en/motion/products/wratten/neutralDensity.jhtml?id=0.1.4.16.16&lc=en quote: Neutral Density No. 96 Filters Used to reduce the intensity of light by a definite ratio, without affecting the tonal rendition of colors. Neutrality is superb only in the visible spectrum.  |  IP: Logged Darryl Spicer Film God Posts: 3250 From: Lexington, KY, USA Registered: Dec 2000 posted 09-02-2004 10:52 AM                    bump  |  IP: Logged

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