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i cant get any closer backfocus without finding an appropriate SCT to M48 adaptor that will screw onto the reducer, the thread on all the ones i have seen are not long enough.
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Contact Jushua Bunn on here John, I'm sure he'd make you precisely what you need and I've heard nothing but good things about his machining.
I have a lathe, can't remember how to thread on the things, 25 odd years without one......I'll refresh my brain one day (or loose what little I have left) but I'll keep my rough, shoddy machining for my own projects where any loss is on me. I still have the big text book on machining, it has everything. I just have to remember where I put it or where my son put it, I bought the lathe and milling machine for him.
https://www.iceinspace.com.au/forum/...ht=joshua+bunn