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TS-Optics 8" f/12 Cassegrain 203/2436 mm

US$ 1,095.57

Not in Stock: will Be Backordered

Short Description

TS 8" f/12 Cassegrain telescope with fused Quartz mirror and only 33% obstruction - the ideal alternative to a Schmidt-Cassegrain

  • Aperture 8" - 203 mm
  • Focal length 2436 mm
  • F-ratio f/12
  • Large illuminated image field with 45 mm diameter
  • Hyperbolic secondary mirror and parabolic primary mirror made of Quartz glass for stable focus position
  • 99% reflection on primary and secondary mirror for an even brighter image
  • Quick temperature adaption due to open design
  • Pure reflective system without Schmidt plate or meniscus lens - fully suitable for Infrared
  • Only 33 % linear obstruction - very well suited for visual astronomy
  • 2" MONORAIL focuser with micro-gear reduction and 1.25" reduction are included
  • M90 extension tubes for trouble-free focusing with almost any accessories included
  • Internal baffles for higher contrast
  • Losmandy style dovetail and Vixen/EQ5 style dovetail for trouble-free adaption to all popular mounts
  • Finder-scope shoe is also included
  • Very economically priced, compared with other classical Cassegrains

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Description

Details

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.

The advantages of the TS-Optics Cassegrain telescopes in summary:


♦ 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 fixed
♦ 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.
♦ Compact tube with only 580 mm length - can be operated with smaller mounts
♦ Primary and secondary mirror are adjustable


The TS-Optics Cassegrain is a versatile telescope


♦ Mobile travel scope: Take the compact and light telescope with you to your traveling location. It only takes a few seconds to unscrew the focuser, making the Cassegrain even more compact.

♦ Telescope for observation of astronomical objects Due to the bright and contrasty image and also because of the large corrected and illuminated image field, the Cassegrain is optimal for observation of astronomical objects. 2" and 1.25" accessories are not a problem. The obstruction by the secondary mirror is only 33%. This is comparable to Schmidt-Cassegrain telescopes. As a result of the 99% reflection of primary and secondary mirror the image is significantly brighter. Even the field sharpness is better, because the image field is basically flat.

♦ Telescope for astrophotography: The Cassegrain is very well suited for photography of the moon and the planets. The contrast of the image is very high. Due to interior baffles stray light is effectively suppressed. Planets and tiny moon craters can be seen without the slightest chromatic aberration. Thanks to its micro-gear reduction the Crayford focuser permits precise focusing. When using modern, highly sensitive CMOS cameras, even deep-sky photography becomes possible with the TS-Optics Cassegrain. An additonal correction lens isn´t needed, because the image field is well corrected up to APS-C sensor format.

Optics:Cassegrain optics with parabolic primary and hyperbolic secondary mirror
Aperture:203 mm - 8"
Focal length:2436 mm
F-ratio:f/12
Reflectivity:99% to primary and secondary mirror
Colimation aid:central marks on the secondary mirror for easier collimation
Suitable for Infrared photography:yes
Backfokus:roughly 150 mm from the 2" receptacle
Tube diameter:230 mm
Tube length:roughly 620 mm
Weight:7.5 kg
Secondary mirror obstruction:33% (linear)
Focuser:2" Crayford focuser with micro-gear reduction
Connection thread of the focuser:M90x1 on the tube
Dovetail:Vixen-GP - Skywatcher-EQ5 style, Losmandy style

In the box:

♦ 8" f/12 Cassegrain
♦ 2" focuser with reduction to 1.25"
♦ Dovetail GP style and Losmandy style
♦ Dust protection cap for the focuser and front aperture
♦ Finder shoe (mounted)
♦ M90 extension tubes
♦ German collimation manual

Additional Information

Additional Information

ManufacturerTS-Optics
NameTS-Optics 8" f/12 Cassegrain 203/2436 mm
MPNTSCas8M
EANN/A
Warranty2 Years
-- TECHNICAL FEATURES --⬇︎
Optical SchemeCassegrain
Diameter203 mm
Focal Length2436 mm
Aperturef/12

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