Ben Langlotz

This is a helpful start. I'm finding that there are no adapters that go the other way (from the male BNCR flange to a conventional thread for) while everyone seems to need adapters for BNCR lenses, and not for cameras. Maybe the solution is to obtain or use the existing body cap plate and drill and tap it. How about the idea of un-converting the camera back to a conventional lens mount? Are there easy parts lying around, or is this a major and pricey effort for a hobbyist suggesting I should sell the camera and try to find one that suits without modification? The flat base info is good. I also wonder whether I might find a thicker vintage one and sell the modern one. Thanks for the help so far.

I’m preparing something of a museum display of a rare Questar Cinema Model based on a Questar telescope and an Arriflex 35mm IIC camera, and need advice about properly configuring the camera. The desired setup is depicted in this Questar Advertisement. It was created by the late cinematographer David Quaid with Questar, and as a Questar collector I obtained his example from his daughter. I have since obtained an Arriflex IIC for mounting on display, and perhaps even using. I have two challenges: The scope came with a flanged Arriflex mounting plate that adapts to the standard camera threads to connect to the telescope, as seen in the photo below. This has a 69mm outer flange diameter. The camera has a larger mount that receives an 83mm diameter flanged body cap plate marked “Panavision.” This mount is centered on the film frame, not setup for a turret as I best understand it. I simply need to know a source on either a mount that adapted from a male 83mm flanged plate to C mount (or P mount) camera lens threads (I forget with, easy to adapt), or to modify this or another body cap plate for threads. Because both camera and scope are supported, this does not need to be a robust connection. The camera needs a 1.5” base to elevate the optical axis into alignment with the axis of the scope. The camera has a handgrip motor that is mounted with a 0.75” thick bottom plate to the motor can extend upward for a flat bottom camera. The Questar Cinema models are depicted with a 1.5” motor/base that does the job - presumably the system was designed for these. Some are labeled “Cine 60”. Others are depicted with a different motor base. Getting the terminology for these motor bases correct would aid my eBay searches, as well as that for the lower profile one I might sell on Ebay to fund the alternative.