Fully multi-coated prisms - unlike some other binoviewers that look identical externally.
Helical focuser built in to each eyepiece holder.
1.9x corrector (OCA) included to reduce focuser in-travel: needed for most Newtonians.
Can be used with or without OCA in SCTs and Maks.
Plenty of clear aperture: no noticeable vignetting with 19mm Panoptics or 25mm Plossls.
One pair of 20-25mm eyepieces can accommodate all types of objects, by using OCA and/or barlow to obtain different powers. See this thread for details.
Please note:
With the included OCA there is sufficient focuser travel for GSO 8" Dobs, but not for 10 and 12" GSO Dobs. For these scopes a long barlow or a different OCA will be required to reach focus.
Right hand side barrel is a tight fit for 1.25" eyepieces. Some eyepieces slide in easily (e.g., GSO plossls), while others are a very snug (e.g., 19mm Panoptic, Antares Elite), which can make it inconvenient to change eyepieces in the field.
I also have pair of excellent 25mm Antares Elite 5-element Plossls for sale for an absolute bargain price with binoviewer purchase.
