Schmidt-Cassegrain 279/2800 TPSP-SC11 Telescope

Schmidt-Cassegrain optics are hand-figured by skilled opticians and fabricated to the highest standards of optical smoothness and correction, ensuring diffraction-limited premium optical performance that is second to none worldwide.

The Schmidt-Cassegrain optical system folds the light path back on top of itself, thus producing a powerful long focal length instrument in a compact optical tube. A shorter tube means less bulk and weight to lift and transport. The closed optical tube also serves to keep the optics cleaner. These are prime design advantages of an CSC.

On each spherical shaped primary mirror of low thermal expansion glass, aluminum is vacuum deposited to the front surface and then over coated with hard quartz (SiO 4 ). Additional layers of Titanium Dioxide (TiO 2 ) and (SiO 4 ) are then applied. The white-water glass aspheric shaped "Schmidt" corrector lens is multi-coated with Metallic High-Transmission Coatings, MHC, (Magnesium Fluorite, MgF2, and Hafnium, HfO2) to insure maximum light through-put approaching 97%. The system's overall light transmission from 400 to 750nm approaches 84%. A secondary mirror is attached to the center of the corrector plate. This smaller mirror is fabricated similarly to the primary mirror. Internal light baffles and blackened interiors help prevent stray, unfocused light from reaching the focal plane and reducing contrast.

Optical focus is achieved by micrometric mechanical movement of the primary mirror forward or backward on an internal "slider" shaft. The primary mirror is perforated in the middle and the observer views at the focal plane which is positioned just outside the back of the optical tube.

The optical tube material is rolled steel, powder coated reflective gloss black with gold fleck accent. The front and back cells are cast aluminum painted black.

Optical Design	Schmidt-Cassegrain
Lens Material	Mirrors: LTEG; Corrector: Water White Glass
Diameter	279mm
Focal Length	2800mm
Scondary Mirror Diameter	95mm
F/ratio	F/10
Highest Practical Power	660x
Faintest Steller Magnitude	14
Resoving Power	.50 arc sec
Finderscope	9x50 Viewfinder
Focuser diameter	1.25", 2" optional
Diagonal	1.25"
Eyepiece(s)	1.25" Super Plossl 32mm and 10mm
Mount Type
Slow-motion Control
Counterweight(s)
Piggyback Bracket
Accessory Tray
Ground Board Diameter
Ground Board Weight(s)
Motor Drive
Go-to
Tube Weight	12.5lb
Tube Dimension(dia. x length)	17" long
Tripod Height
Shipping Weight	96.00 lbs
Shipping Carton Dimensions

Standard accessories may vary.