TS Optics 3" Newtonian coma corrector and 0.85x focal reducer

Teleskop-Service has developed the Newtonian coma corrector and now offers at the same time a reduction of the focal length and an increased speed. The focal ratio of an f/4 Newtonians is improved to f/3.4. At the same time, coma is fully corrected.

The corrector can be used with all Newtonian telescopes with 3" focuser. It can be clamped directly via a 3" receptacle or threaded via the M82x1 thread. We recommend the corrector for all Newtonian telescopes of at least 10" aperture.

The usable field

The corrector illuminates up to 46 mm to 100% with very good correction at the same time. A sufficiently large secondary mirror is required, of course. With this, you can use cameras with sensors up to full-frame size. We recommend to always use a star at the outer third of the field of view for focusing, thus you achieve a very good sharpness over the entire field.

Adaption of the camera

At the camera side, the corrector provides three threads for camera adaption.

• M76x1 thread (male): this thread is already in use for the connection adapter for the threaded joint.
• M68x1 thread (female): working distance to the optimal sensor position is 61 mm
• M54x0.75 thread (female): working distance to the optimal sensor position is 55 mm

Adaption recommendation to M48x0.75

With 55 mm working distance this adaption is perfect for DSLR and astro cameras. You need:

• 2 TSO-M68abstimm1 fine tuning rings with 1 mm thickness each
• TSO-M68a-M68a: conversion adapter to male M68 thread
• TSO-M68i-M48a: reduction to male M48x0.75 thread

Delivery contents

• 0.85x Newtonian corrector
• Metal dust caps