How difficult do you think it would be to get an adapter ring 0.25" width, with 25mm x32 internal thread and 28mm x32 external thread. Well it is nigh on impossible, although the threads are standard in photographic equipment. All other combinations of adapter rings with these external/ internal threads are readily available. I am not going to buy a lathe to make my own, I only need one.
3D print? Maybe somebody already designed on on thingiverse.com
Theo
Try these guys - SRB Griturn. They have almost every camera lens adapter there is and will make you a custom one for a price. Assuming that what you want is physically possible to machine from a metal rod.
Failing that try Telescope House who also do bespoke optics adapters or Edmund scientific whose online catalogue is now so awful I try to avoid.
Another possibility is to coat both threads in ptfe tape, and then fill the gap with car body filler.
Thanks...I have sent SRB an email.
Maybe buy a cheap 28mm filter and a cheap 25mm filter, throw away the filter glass and glue the 25mm ring inside the 28mm ring. I believe each filter can take another filter of the same size on the front screw thread so you will end up with an internal 25mm and a external 28mm
Unless size is critical can you achieve this thread combination by using
2 or 3 available adaptor rings together
If that will do it SRB do every filter adapter size shift going.
No, because I need to be within 7mm for focus.
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