Advice needed on modding an 80mm F5.9 scope
Posted: Wed Aug 27, 2014 5:49 am
Dear All,
I have a WO GT81 F5.9 scope that works well as a telephoto and with a front-mounted SM40 etalon.
I would like to exploit the full aperture though. I have a PST mod back-end that I use with my Tal 100
which also works well.
The easiest way ( and most expensive ) way forward is to get a larger front mounted etalon. Sadly,
secondhand units are hard to come by here in UK.
I have attempted to mock-up a mod via barlows and my PST mod back-end, but getting
focus is problematical and my atempts have failed spectacularly so far. I have seen the thread on glasspath correctors to give enough focus but I don't want to throw more money away chasing a potential solution if it is not possible for this scope ( without major surgery).
Has anyone modded a GT81 ?
Best wishes,
David
I have a WO GT81 F5.9 scope that works well as a telephoto and with a front-mounted SM40 etalon.
I would like to exploit the full aperture though. I have a PST mod back-end that I use with my Tal 100
which also works well.
The easiest way ( and most expensive ) way forward is to get a larger front mounted etalon. Sadly,
secondhand units are hard to come by here in UK.
I have attempted to mock-up a mod via barlows and my PST mod back-end, but getting
focus is problematical and my atempts have failed spectacularly so far. I have seen the thread on glasspath correctors to give enough focus but I don't want to throw more money away chasing a potential solution if it is not possible for this scope ( without major surgery).
Has anyone modded a GT81 ?
Best wishes,
David