Baader Planetarium Multi-Purpose Coma Corrector
[BP_30_2458400]

Simple to use and produces stunning results. Eliminates coma on fast Newtonians to produce beautiful wide-field images. Simply replace the current 2" nosepiece on your T-ring adaptor with this corrector, and coma dissappears without any sideffects whatsoever. The field-of-view remains the same and the focus position doesn't change at all. A must for anyone wanting to do astrophotography using a Newtonian reflector.