Matthew. Thank you for your response. I was suggesting the cogbelts as a possible option for your design. I actually have a four-plate 16mm Steenbeck editor which I want to modify as a a flash scan machine. Your link looks to be a good source of replacement belts as the existing belts whilst still working are a bit soggy from years of use and grease getting on them.
The optical path from a camera could be a bit tricky for me. The SI2K has a 2/3" sensor capable of 2K apparent resolution. It is actually a bit softer than that by the time an OPLF and debayering has had its way but for late sixties to late eighties 16mm reversal and workprint, it would be adequate.
I found when making AGUS35 adaptors that an approx 24mm image width required approx a 40mm zoom setting on a half-inch sensor camera like an EX1 with a 4+ achromatic dioptre in the path to enable close focus from about 7 inches which includes the bent path through a set of erecting prisms.
With the SI2K’s 2/3" sensor, I will need a longer focal length lens and a dioptre to get a close view on the 16mm film image through the split wheel of the Steenbeck. The original Steenbeck projection lens may be capable of throwing an image which may be resolveable into the camera with a technique similar to an auto-collimator. The lens on the camera then need only be the same or very near to the focal length of the Steenbeck’s projection lens.
The wrinkle in the mix is that the Steenbeck projection lens is very compact and may porthole the image of a more common c-mount lens of the same focal length. The Steenbeck lens is placed such that the path of focus through the shutter prism of about 40mm diameter is correct to the film plane. With the prism shutter out of the path, the placement of this lens in the original mounting will be incorrect and it may no longer satisfactorily project the film image in the same scale.
I’m just going to have to suck it and see once I get a lamp working. The original Steenbeck lamp is not working.
In the Sony 90 degree mirrored projector to 2/3" video telecine arrangement, there is a 16mm C-mount lens, a forward offset of about 5mm to achieve closer focus upon the image out of a 50mm projection lens. I got sort-of okay images from it but with the artifacts of a shutter projector drifting slowly in and out of sync with the camera frame rate.
I may try that lens with the Steenbeck projector lens to see how I get on but don’t hold much hope for the arrangement. The 50mm projection lens has a nice wide front element. The Steenbeck projection lens is tiny by comparison.