Quote:
Originally Posted by leo
There seems to be some doubt whether BVs work with Newtonians with a low focal ratio.
The William Optics website says "most" Newtonians are OK. Talks here are that possibly an extension tube or Barlow add-on is needed. But no one really seems to know.
Or any other brand?
Rather than buy and be disenchanted, does anyone have the experience to share?
Thanks 
Leo |
Leo and Larry,
From my own personal experience I can safely say the WO comment about working in most newts is very optimistic! Out of 4 I've tried, zero worked, with their supplied 1.6X OCS. I believe it does work with a short extension tube between the OCS and the BV, but the magX will increase further. I got it to work with a 2X barlow and no OCS, but this gives more like 4X. Most of these generic BV's will be the same.
In the end, I contacted Harry Seibert and ordered a Multimag OCS. This gives me 1.25X, 2X, 3.5X with newts and 1.25X, 2X, 3X and 3.5X with the refractor. Works in ALL my scopes now, including a 6" F8 refractor. The Seibert OCS is FAR superior to the WO one optically, btw. This WO/Seibert combo works very well for not that much money. The supplied WO 20mm eyepieces are reasonably good.
Clear skies.
Forgot to mention, the Seibert OCS also improves focus/sharpness at the edges of the field with all mag settings, and as far as I can tell with all eyepieces I've tried so far.