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Author Topic: Ashcraft 35/70 focusing data Kenneth Wuepper Phenomenal Film Handler Posts: 1026 From: Saginaw, MI, USA Registered: Feb 2002 posted 05-23-2004 06:34 AM                     We need the critical distance from the back of the reflector to the aperture plate when installing the Ashcraft Carbon Arc Lamp. The usual critical distance is 29 1/2 inches. I believe that this lamp is different. Could anyone please supply this information? Thanks KEN  |  IP: Logged Stephen Furley Film God Posts: 3059 From: Coulsdon, Croydon, England Registered: May 2002 posted 05-23-2004 06:47 AM                     What model of Ashcraft lamp? There are manuals for a couple of them in the Film-Tech manuals section; they give this information.  |  IP: Logged Robert Throop Master Film Handler Posts: 412 From: Vernon, NY USA Registered: Jun 99 posted 05-23-2004 09:35 AM                     Kenneth, The Core Lite series of lamps specified 29.5-29.75 inches as the working distance. I recently installed a pair of Core Lites on Motiograph bases. Due to the design of the base the closest I could get the lamp was 31". It works fine although I'm sure there's some light loss. We nearly doubled the light from the old Strong Mighty Nineties at the same current.  |  IP: Logged Steve Kraus Film God Posts: 4094 From: Chicago, IL, USA Registered: May 2000 posted 05-23-2004 10:54 AM                    Bless you all for perpetuating the art.  |  IP: Logged Gordon Bachlund Jedi Master Film Handler Posts: 696 From: Monrovia, CA, USA Registered: Aug 1999 posted 05-23-2004 01:55 PM                        Amen!  |  IP: Logged Kenneth Wuepper Phenomenal Film Handler Posts: 1026 From: Saginaw, MI, USA Registered: Feb 2002 posted 05-23-2004 02:34 PM                     OK! Thanks for all of the responses. We are still running carbon arc and single reels. If we can get the light output where it was before, we will continue until there are no more carbons. Running two Xenon lamps for the entire showing is not a pleasant nor efficient option for us. The lamp nameplate says 35/70. The current is 150 Amps and we have the matching Ashcraft power supplies with silicon diode rectifiers. The backup power supplies are Ashcrafts with Copper Oxide stacks. These machines are Cinemeccanica V-10 and it is not possible to get the lamps much closer to the aperture plates. I measured the light and it is less than we were getting before the theatre was idled for restoration. These specific lamps are not covered in the Manuals section here, that is why I have posted this thread. Your help is sincerely appreciated. KEN  |  IP: Logged Robert Throop Master Film Handler Posts: 412 From: Vernon, NY USA Registered: Jun 99 posted 05-24-2004 09:05 AM                     Kenneth, The Cinex which I think was sold as the 35/70 had a working distance of 34.5".  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 05-24-2004 01:15 PM                     Post a picture of the beast as the cinex and the super cinex and some of the corelites get a bit confusing  |  IP: Logged Kenneth Wuepper Phenomenal Film Handler Posts: 1026 From: Saginaw, MI, USA Registered: Feb 2002 posted 05-24-2004 01:49 PM                     Thanks Robert for that piece of information. I am certain that there is no way to get the reflector within 29 inches of the aperture. It is possible to move it to the dimension you suggest and that is not where it is now. Gordon, I will take some photos of the booth later this week. We have run "Titanic" and "Casablanca" for two performances each. The images are not up to our old standards for brightness and sharpness. Thanks again, KEN  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 05-24-2004 06:47 PM                     The Vic10 had a rather small drum shutter and it may be thottling the light as well Somewhere in the dark mists of the past I remember reading something about issues with certain lamphouses on vic10's  |  IP: Logged John Walsh Film God Posts: 2490 From: Connecticut, USA, Earth, Milky Way Registered: Oct 1999 posted 05-24-2004 10:10 PM                     There was a note in the Ashcraft Corelite 150's we used saying that projectors with barrel shutters would prevent the lamphouse from being positioned forward enought for correct distance.  |  IP: Logged Robert Throop Master Film Handler Posts: 412 From: Vernon, NY USA Registered: Jun 99 posted 05-25-2004 09:44 AM                     The Cinex manual specifically refers to using the Motiograph AAA with no problems.  |  IP: Logged Kenneth Wuepper Phenomenal Film Handler Posts: 1026 From: Saginaw, MI, USA Registered: Feb 2002 posted 05-26-2004 10:06 PM                     Recent trip to the booth yields this information: The Ashcraft series is a Cinex Special. The model number is CS-35/70. I cannot attach the photos but I can e-mail them if you want to see the nameplate and the mounted lamp. KEN  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 05-27-2004 08:32 AM                     Well since it appears it is a Cinex try positioning it at the 34.5" mark and see what happens The Cinex was an excellent lamphouse  |  IP: Logged Kenneth Wuepper Phenomenal Film Handler Posts: 1026 From: Saginaw, MI, USA Registered: Feb 2002 posted 05-27-2004 03:31 PM                     Thanks Gordon. I have no manual for this beast and although the innards appear as all other Ashcrafts, that distance seems more logical. This unit has a very large dichroic mirror reflector. I believe we got two of the last ones out there. I believe there is a special arcscope graticle for this lamp also. Both of the original paper ones were lost over the years and so the two in there now may not be correct. The Positive position is different for the two formats. A distance of 6 3/4 inches from back of reflector to the crater edge appears best for 35mm on the screen. KEN  |  IP: Logged

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