Binoviewers typically use about 125mm of distance in the optical path. i.e. you have to rack in a lot!. For this reason they are most suited to SCT telescopes whereby focusing is achieved by moving the primary mirror.
However most binoviewers can be used on refractors and reflectors with the addition of a 2x amplifier/corrector (Tele Vue terminology). A 2x Barlow may work.
Tele Vue state the following on their website with regards to their Bino Vue, which has a 5.1" (130mm) optical path length.
http://www.televue.com/engine/TV3b_p...e#.UzH4X6iSy5I
"The 2x Amplifier/Corrector eliminates prism aberrations (spherical, color, and edge of field astigmatism). The faster the system the greater the need."
Note using a 2x amplifier/corrector does mean low power is not easy on a Newtonian due to focal length. e.g. A 1200mm focal length telescope with 2 x 24mm eyepieces and 2x amplifier/corrector will give 1200/24*2 = 100 magnification. This is still OK for a full lunar disc if the eyepiece is say a 24mm Panoptic with 27mm field stop diameter provided your binoviewer also has matching field stop diameter and does not vignette. The Tele Vue Bino Vue works very well with 24mm Panoptics without amplifier on SCT and with on Newt and refractor.