Through the eyepiece tube

The view through the eyepiece tube of the reflector telescope can be confusing. This page will hopefully help.

A sheet of yellow paper has been placed behind the secondary mirror.

The view through the focus tube of a typical 200mm (8″) f/6 Newtonian Reflector

Showing n reflections in the sight/focus tube > secondary mirror1 > primary mirror2 > secondary mirror reflection3

Using a Collimation Cap

Using a Combination Cheshire / Sight tube Collimation tool

Reflections viewed through the sight tube of a Newtonian Reflector

Showing n reflections in the sight tube > secondary mirror1 > primary mirror2 > secondary mirror reflection3

Acknowledgement: I am indebted to Vic Meynard for his invaluable assistance in checking the accuracy of these images.

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2 comments

  1. Finally, some representations of the view down the eyepiece that I can actually match to what I see! Very helpful thanks 🙂

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