Quote:
Originally Posted by Saturnine
I have an 150mm f6.5 refractor that I made, with binoviewing in mind, so that I can reach focus without the OCS, this arrangement with the 20mm wide angles gives me an 80' fov which is fine for most bright dso's
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The whole idea of the barlow lens amplifier is to increase the f ratio so that you can get the light of a faster mirror or lens through the long narrow light path in the binoviewer. Using a stock binoviewer at F6.5 you may be loosing a third to a half of your 6" lens through vignetting at the mouth of the binoviewer.