TS-Optics 10" f/12 Cassegrain telescope 254/3048mm OTA

TS-Optics 10" f/12 Cassegrain Telescope

Cassegrain telescopes combine the benefits of a Newtonian telescope being a pure reflective system with a short-built design. In terms of optical quality Cassegrain telescopes are superior to customary Schmidt-Cassegrain systems. Cassegrain telescopes are mainly used for photography of the moon and the planets and for observation of astronomical objects. Thanks to the highly sensitive sensors built into modern astro cameras, even deep-sky photography of nebulae, star clusters and galaxies is possible.

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 adaptation than a SC, due to open design.
• Additional fans for the primary mirror
• Brighter image due to 99% dielectric coating on primary and secondary mirror.
• No shifting, because the primary mirror is fixed.
• High-quality 3" 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.
• Generous backfocus allowing the use of 2" accessories.
• Primary and secondary mirror are adjustable

Technical Specifications

• Optics:Cassegrain optics with parabolic primary and hyperbolic secondary mirror
• Aperture:254 mm - 10"
• Focal length:3048 mm
• F-ratio:f/12
• Reflectivity:99% to primary and secondary mirror
• Collimation aid:central marks on the secondary mirror for easier collimation
• Suitable for Infrared photography:yes
• Backfokus:roughly 150 mm from the 2" receptacle
• Weight:16.4 kg
• Tube length (w/o focuser):70 cm
• Secondary mirror obstruction:33% (linear)
• Focuser:3" Monorail focuser with micro-gear reduction
• Connection thread at the back of the tube:M117x1 thread (male)
• Dovetail:Losmandy style 2x