Quote:
Originally Posted by multiweb
Hi guys, would you have recommendations on a low profile 2" (or more) focuser that would fit within a 40mm to 50mm gap (all inclusive of threads). Travel doesn't have to be much. I'm interested in compactness and stifness. TIA. 
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Hi Marc,
If you want to go to an astrocam on one end of the focuser, especially one with an M42 x 1mm thread, perhaps you could try an M42 Helicoid focuser, which is typically M42 male at one end and M42 female at the other end; however, and it may suit you, other threads are also available.
As an example....
https://www.ebay.com.au/itm/Brass-M4...UAAOSwFSxZ5wux
That is a 17-31mm extension, but you will find shorter and longer examples.
Best
JA