The VMC260L Optical Tube Assembly...A Catadioptric with a 260mm Objective, 3020mm f.l. (f/11.6) with a Big 10¼" Aperture! Makes Familiar Faint Fuzzies Bright!
With 169% of the light gathering power of our 8" scopes, this unique system makes it possible to offer a Maksutov-Cassegrain-like design in a big but manageable package. Consisting of Pyrex primary and secondary spherical mirrors, Vixen's improvement of Maksutov's design is the incorporation of a 2-element corrector lens in front of the secondary mirror.
This system tidily corrects spherical aberration and field curvature. It also eliminates the need for a big, expensive and heavy front corrector plate found in conventional Maksutov designs. In addition, the resulting open tube design excludes the possibility of dew condensing on a full-aperture corrector.
Focusing is via primary mirror movement and optical collimation is accomplished by secondary mirror adjustments, just like on the smaller Schmidt-Cassegrains telescopes many amateurs are accustomed to.
The VMC260L OTA is supplied with 2 eyepiece adapters, a dual T-thread flip-mirror with dual 1¼ eyepiece adapters, a 7x50mm finder, carry handle and rail-system with sliding balance bar.