Archived posting to the Leica Users Group, 2005/04/26
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Don't forget, a lot of these motion picture camera movements are based on the old Mitchell movement - real close to bullet proof. A very simple but precise mechanism. I would wager that there is a very infitesimal increase in internal temperature after running a full 1000' if at all. The biggest worry is the build up of emulsion that "wears" off the film going through the gate. You have all heard the expression of "check the gate" in docs on making of films - they are looking for a build up of emulsion in the gate - through the lens to the gate with a light to see if they might have to do a re-take as the build up can cause scratching. Jay Ignaszewski -----Original Message----- From: lug-bounces+bonvini=optonline.net@leica-users.org [mailto:lug-bounces+bonvini=optonline.net@leica-users.org]On Behalf Of jon.stanton@comcast.net Sent: Tuesday, April 26, 2005 5:37 PM To: Leica Users Group Subject: Re: [Leica] Motion picture cameras hot? Additional follow-up to Jay's comments: I read this after my response to you. The man is right. We are using gear that was made last week as well as 30 years ago. This stuff must last. High speed cameras have heavy duty movements that will get hot however the shot durations tend to be short and they cool quickly. BOB Jay's Comments: "Hi-speed cameras (frame rates over 150fps) had a tendency to sometimes over heat, but not your normal production cameras. Actually, Panavision cameras come with a heater for cold weather to insure proper lubrication of the gears and motor. And with 35mm camera bodies being so expensive (you can not even buy Panavision, only rent) folks would be a tad bit upset if they went through multiple bodies on a show. Having been a Panavision and Arriflex technician in my somewhat checkered past, the only cameras I saw quit on a shoot had been abused, batteries died, bodies dropped and even one where a plane struck the camera on take off (remote camera - no operator). Even one where the operator had a battery die and decided that since it was 12 volt - he would hook it up to his car battery and run it that way. Well, he swapped the polarity and burn out every wire in the body, which gave off acrid fumes which etched every bearing surface (except the jeweled bearing) requiring a complete rewire and rebuild. Very expensive. No, these bodies are very robust. Jay Ignaszewski" _______________________________________________ Leica Users Group. See http://leica-users.org/mailman/listinfo/lug for more information