Maybe you can take the width and thickness of the stripped gear as well as what is on the other side mating it and replace them both concurrently as a pair? The shaft thickness can be adjusted as necessary as is the cotter pin hole. Sure might be easier than finding the original specs. By the way I have two brand new Lacon 380 184 condensers in their boxes and another barely used from a day long ago.
The people selling it were an environmental planning company. They used to get aerial negatives and blow them up to make maps, etc. It came with this 2 glass carrier that is marked Foto-Optical Corp. anyone know anything about these?
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Condenser focal length and lens focal length need to be coordinated via the chart in the manual to ensure even distribution of light. The way I think of it is the condensers are focusing the light at a certain spot and the lens needs to be at that spot. If the lens is too long or too short, it will not be in the right spot. If you are just using the center of the light (6x6cm) you might be able to violate this and get good results. That is you could try those 380 condensers with a 80mm or 105mm lens and see how even the projected field is.
Every time bulbs for that head are discussed I always post the same thing. Consider using an diffusion disk as the target for the condensers (rather than the globe of the hard-to-find lamp) and illuminate the diffusion disk from behind with any light you want. That is how my Philips condenser color head works. You could use LED or Halogen or anything else for illumination behind the disk.
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