I have been advised that changing focuser from low profile to higher, will need shortening of the primary to secondary distance in an OTA. This is for a 1700mm F8 scope with a current low profile focuser and small secondary.
I want to fit a Baader Steeltrack https://www.firstlig...newtonians.html
What are the margins within which focuser height can be changed? I think for the scope in question, perhaps a low profile focuser was used in order to get focus, rather than choosing a focuser first, chicken & egg.
Are there any other solutions? Collimating mirrors is bad enough!