Astronomy Specialist



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Save big on this used SkyWatcher f/5 Coma Corrector for Newtonian telescopes! The optics are in great condition. As it is a used item, there are cosmetic blemishes on the housing that do not affect performance. 

The SkyWatcher coma corrector for f/5 Newtonians is an indispensable accessory for the advanced astrophotographer.

The Newtonian telescopes have a fast focal ratio, a flat field and a small obstruction caused by the secondary mirror. These factors make Newtonian telescopes ideal for high resolution observations and astrophotography. 

The only relevant aberration that affects Newtonian telescopes is coma, an extra axial aberration that makes stars appear elongated or like comets. This aberration is more visible with short focal ratio Newtonians but it can be corrected with a coma corrector. 

The SkyWatcher coma corrector is specifically designed for Newtonians with a focal ratio of f/5. The telescope side has a female tread for 2" filters and on the eyepiece side it features a M48 x 0.75 male thread for T-2 rings or camera adapters.


Magnification factor

0.9 x

Barrel size

2 "


2 elements

Camera connections

M48 x 0.7

Working distance

55 mm from the M48 x 0.7 thread

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