![]() I wanted to see if the movement had any signs of it being able to be converted to 3 perf. I simply removed it from the body which is a standard practice, took the cover off the back (which is held in with little pins) and dabbed some lubricant in the appropriate positions. There is more clearance space between mount and mirror in a 16mm camera.įor the record, I only touched the movement which is not part of the front of the camera where the mirror shutter is. I don't know what assemblies you might have removed, but if it was the mirror or the groundglass holder you may need to send the camera to a technician to be correctly reset.īy the way, be careful fitting 16mm format lenses to a 35mm reflex camera, occasionally the wider focal lengths can protrude enough to hit the mirror. When you pull a complex film camera like a Moviecam apart, there are multiple crucial settings that need to be either left alone, or reset with jigs, gauges or a collimator. Or it could be that the lens mount is sitting forward, either from being incorrectly fitted, or because the floating rib that holds the innards is out of adjustment, which means both flange depth and groundglass are out. It could be the mirror height that is off, causing the optical distance to the groundglass to have changed. It could be that the groundglass position is way off, but the flange depth is OK. ![]() Until you shoot a film test (or have a technician check the FFD with a depth gauge and backing plate), you can't really check if the flange depth is out too. So now the issue at this stage isn't really the flange depth but the groundglass depth, which is what determines the viewfinder accuracy. If you were more specific about the lenses and cameras you're having trouble with I could offer you less generic advice. A lens with a short back focus (like C-mount or M4/3) can't be used on a camera with a longer flange depth (like a PL mount Arri) unless it sits far inside the mount or you only want to shoot macro. You use adapters to change the back focal distance of a lens to match a camera's flange depth, though not all adapters are accurately set up to within 0.01mm. Lenses are set up so that their back focal distance matches the flange depth of the mount system. If it has a Micro 4/3 mount it will have a flange depth of 19.25 mm. ![]() The flange depth of an Aaton with an Aaton mount will be 40.00 mm, but if it has a PL mount it will be 52.00 mm.Ī digital camera with a PL mount will also have a flange depth of 52.00 mm, regardless of the sensor size. Flange distance is not format specific, 16mm Arris have the same 52.00 mm flange depth as 35mm Arris for example.
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