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such as 20DCV in our demo
the image it delivered is well controlled chromatic aberration
and excellent flatness of field
you still must pay attention to the unavoidable tolerance between the installation of the collimator and internal diameter of a focuser
They are all made from GSO
Newtonian F/4 ~ F/6 Coma Corrector such as 20DCV in ourThe coma corrector is 3 elements fully coated optics to elimninate the coma caused by Newtonian. The corrector comes with a T thread adapter to be attached with DSLR directly. The demo pictues show the difference when the coma corrector is used for Moon photography. The item is free shipping in US mainland only.