TS Optics Star Diagonal Mirror - 1.25" mount Not only is the coma

Not only is the coma outside the optical axis corrected - as with other so-called "coma-free" optical designs available on the market (see also our test image) - but also the field curvature

Mounts compatible with ASIAIR PLUS can be found here

ST-4 interface:    not required

Design: APO Triplet Refractor

The PDF can be found here

TS Optics Star Diagonal Mirror - 1.25" mount Not only is the comaThis Star Diagonal zenith mirror provides a correctly viewed upright image (but still laterally reversed). It is particularly well suited for Refractors and Cassegrain telescope designs by offering a much more comfortable viewing position meaning you can view the object through the eyepiece quite comfortably standing up. The mirror provides ah high contrast image and is suitable for Refractors, Schmidt Cassegrains and Maksutov Cassegrain Telescopes.