Founder Optics 0.8X Focal Reducer for FOT86/FOT106 - RED0.8X type-extension-tubes-and-spacers As long as the telescope

As long as the telescope has at least a 2

ZYGO Test Report

Bringing nature closer to you in its true colors and contrasts is the essence of Kite Optics's design and engineering philosophy

They are also useful (with or without diagonal) when you need more out-travel for focusing on nearby terrestrial subjects

Founder Optics 0.8X Focal Reducer for FOT86/FOT106 - RED0.8X type-extension-tubes-and-spacers As long as the telescopeThe Founder 0. 8X Focal Reducer was designed to reduce the effective focal length of the FOT86 or FOT106 refractors, but it will work with pretty much any f 5 to 5 7 refractor. The RED0. 8X has interchangeable M42 male and M48 male mounting threads. The optics, which are fully multi coated, have a clear aperture of 38 mm.