TS-Optics 8" f/12 Cassegrain

TS-Optics 8" f/12 Classical Cassegrain Telescope

Cassegrain telescopes combine the benefits of a Newtonian telescope being a pure reflective system with a short-built design. Cassegrain telescopes are mainly used for photography of the moon and the planets and for observation of astronomical objects. 

Main features

• Large corrected and illuminated image field due to parabolic primary and hyperbolic secondary mirror with less field curvature than with SC telescopes.
• Pure reflection system without Schmidt plate, as a result even Infrared photography becomes possible at full sharpness.
• Significantly quicker temperature adaption than a SC, due to open design.
• Brighter image due to 99% dielectric coating on primary and secondary mirror.
• No shifting, because the primary mirror is fixated
• High-quality 2" Crayford focuser with micro-gear reduction and compression rings for 2" and 1.25" accessories
• 33% obstruction caused by secondary mirror, comparable to SC telescopes.
• Better sharpness on the optical axis due to precise mirror surfaces and the lack of a Schmidt plate
• Less problems from dew: with Schmidt-Cassegrains you get condensation on the front plate, not with a Cassegrain
• Interior baffles for even higher contrast
• Generous backfocus allowing the use of 2" accessories.

Technical Specifications

• Aperture: 203 mm - 8"
• Focal length: 2436 mm
• F-ratio: f/12
• Reflectivity: 99% to primary and secondary mirror
• Tube diameter: 230 mm
• Tube length: ~620 mm
• Weight: 8.2 kg
• Secondary mirror obstruction: 33% (linear)
• Focuser: 2" Crayford focuser
• Dovetail: Vixen-style and Losmandy-style

Delivery

• TS-Optics 8" Cassegrain telescope with a 2" Crayford focuser
• Vixen and Losmandy dovetail bars
• Finder shoe
• M90 extension tubes