M42 Extension Ring Set (5 Extensions) classic cassegrain This prism is suitable for

This prism is suitable for refractors

Backfocus without Reducer: 142

you can easily track the object in your eyepiece for more comfortable viewing or even for long exposure photography (especially useful for imaging deep space targets)

This is a major advantage

Also the individual interpupillary distance can be adjusted in a range from 54 to 76mm

M42 Extension Ring Set (5 Extensions) classic cassegrain This prism is suitable forSet of 5 extension tubes with T2 thread on both sides for exact distances and a secure hold of cameras used for astrophotography. This set also comes with a SC to T2 thread adapter. In astrophotography, most cameras are connected to a telescope via a T2 thread (M42x0. 75), which is the most popular international standard. However, in many cases, T2 and T2 ring adapters for connecting telescope focusers to a camera are not the correct focus distance.