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» Film-Tech Forum ARCHIVE   » Operations   » Film Handlers' Forum   » Photo mask by Todd-AO to boost the high end output to 0dB at 12.5K and -1dB at 16K

Author Topic: Photo mask by Todd-AO to boost the high end output to 0dB at 12.5K and -1dB at 16K Thomas Hauerslev Master Film Handler Posts: 451 From: Copenhagen, Denmark Registered: Aug 2000 posted 02-21-2003 11:19 PM                        I'm curious to know how many of FT´s members who requested the new Todd-AO masks for the DP70. The photographic mattes were provided free to anyone who asked for them in return for a short written evaluation - good or bad - of their performance. So please remember to send Dan Leimeter your evaluation of the slits. Please send the evaluation to: Todd-AO Studios Att: Dan Leimeter 900 North Seward St. Hollywood CA USA  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 02-22-2003 01:41 AM                     That's an excellent and desperately needed addition to the AAII. I didn't even know that was available. Still, can that exciter put out enough light through that slit to reach Dolby level?  |  IP: Logged Steve Kraus Film God Posts: 4094 From: Chicago, IL, USA Registered: May 2000 posted 02-22-2003 10:25 AM                    No, you have to install a Gemini bulb as an exciter! Just kidding! I know of the new masks but haven't seen or heard one used. But I think it's wonderful that people at places like Todd-AO no less continue to advance this great machine.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 02-22-2003 11:26 AM                     I used them with some jax lights with them with no probs  |  IP: Logged Christopher Seo Jedi Master Film Handler Posts: 530 From: Los Angeles, CA Registered: Jun 99 posted 02-22-2003 04:12 PM                     Hmm... this modification seems simple enough, and so much better, that I wonder why they didn't use it in the first place?  |  IP: Logged Greg Mueller Phenomenal Film Handler Posts: 1687 From: Port Gamble, WA Registered: Jun 99 posted 02-22-2003 04:45 PM                        I use one. It works as advertised. The problem I had was getting enough light to get to Dolby level. It turned out that the light pipe/condenser lens train was goofed up and after replacing that, it was clear sailing. Very nice boost on the high end  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 02-22-2003 05:51 PM                     It wasn't used in the first place as the then academy curve didn't want extended high end. That was also why the Simplex and RCA slits were in some cases 1.5mil wide  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 02-25-2003 07:10 PM                     Actually to get the best possible performance fomr the DP-70 optical sound reproducer you have to throw out all the stuff thats there now and go to new style LED reverse scan. There are several options for reverse scan on the DP-70 that are available including one new option that may appear at this years Showest. In alot of cases the old light pipe and optics does not allow enough light through for the narrow slit. Sometimes you end up running the preamp gain way high and can barely make it. The JAX light is another option and it now has a fully balanced pre-preamp for much lower hum and noise. Unfortunately though you are still stuck with the old optics here as well, but a fibre optics new light pipe is provided with the US JAX Light. We recently rebuilt a batch of DP-70's in the CLACO shop for a project and we were told by Todd-AO that no more slits were available. Donno if they made another batch recently or not, but we had a full sheet of them reproduced by a local graphic arts person if anyone needs them. Mark @ CLACO  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 02-25-2003 07:35 PM                     Mark said"Actually to get the best possible performance fomr the DP-70 optical sound reproducer you have to throw out all the stuff thats there now and go to reverse scan" The DP 70 was always reverse scan  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 02-25-2003 07:36 PM                     Thats not what it says.....show me where it says that...... You've been stirring up way too many Martinis tonight!! Mark  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 02-25-2003 07:48 PM                     Mark that is cheationg you edited your post after mine I just happened to have cut and pasted your post and verified it against the cached page since this is visible light I gues your were caught "RED" handed  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 02-25-2003 07:49 PM                     Ahhh Gord, You're just too Smart for me... Mark  |  IP: Logged

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