Ultra Corrected Ritchey Chretien, Officina Stellare exclusive optical scheme. Developed for highest photography perfomances and the highest efficiency of light transfer to focal plane, with only two hyperbolic mirrors and two spaced elements back group.
Near zero expansion AstroSitall ceramic glass, 312 mm clear aperture, primary mirror. AstroSitall is used for secondary mirror too.
Fast and wide field F/5.4 focal ratio, 1680 mm focal length.
Ultra corrected field: less than 5 micron stars over a full wide 60mm diameter circle on focal plane.
Compact and light: 720 mm length, 460 mm outside max diameter, 25 Kg weight.
State of art construction: full CNC machined aluminum parts and ultra rigid true carbon truss structure.
Computer designed and optimized, two stage, secondary mirror light shield for minimal obstruction.
Large, 240 mm from back plate, focus extraction to allow the use of every imaging train.
Easy piggy pack of guiding or ancillary equipment thanks to standard four dovetail bar structure.
|Ultra CRC 320 ST|
|Type||Ultra Corrected Ritchey Chrètien|
|OTA assembly type||Carbon open truss tube / CNC Aluminum|
|F / ratio||F/5.4|
|Optical set glass||Sitall|
|Overall OTA length||720|
|Overall OTA Ø||420|
|Spot size (@26 mm |
from axis, w/flattener)
|Zero Expansion carbon truss tube design, unique ed innovative primary cell design, four Losmandy type dovetails, primary mirror three fans ventilation.|