Please note: Last regular shipment before Christmas is on December 19, 2024, after which only express shipments can be sent. Our store is closed on Christmas Eve and New Year's Eve. (Close)
This mirror system is one of the oldest designs along with the Newton and the Gregory. There is usually from a paraboloid primary mirror and a hyperbolic secondary mirror. The light exit is at the rear end of the tube.
VISAC (Vixen 6th order aspherical catadioptric) incorporates high-precision 6th order aspherical primary mirror plus 3-element field correction lens, a ring-fixing metal on the objective primary mirror which decreases the lens flare.