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Slightly used: TS-Optics GSO 6" f/12 Cassegrain telescope 154/1848 mm OTA

Name: Slightly used: TS-Optics GSO 6" f/12 Cassegrain telescope 154/1848 mm OTA
Brand: -TS Teleskope
SKU: 2026-0602-3
Price: 479 EUR

TS 6" f/12 Cassegrain telescope with fused Quartz mirror and only 38% obstruction - a good alternative to a Schmidt-Cassegrain

#TSCas6M: Display item with slight signs of wear

Aperture 6" - 154 mm

Focal length 1848 mm

F-ratio f/12

Large illuminated image field with 40 mm diameter

Hyperbolic secondary mirror and parabolic primary mirror made of Quartz glass for a stable focus position

96% 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 38% linear obstruction - well suited for visual astronomy

2" Crayford focuser with speed reduction and 1.25" reduction are included

M90 extension tubes for trouble-free focusing with almost any accessories included

Internal baffles for higher contrast

Finder scope shoe and Vixen GP style dovetail are also included

OTA, thus no mount in the scope of delivery

Manufacturer: -TS Teleskope

Product number: 2026-0602-3

EUR 479,00RRP EUR 579,00you save 17.3% (EUR 100,00)

incl. 19 % VAT (DE)

The VAT indicated refers to that applicable in Germany. After logging in, the VAT amount is adjusted to the applicable VAT of the stored delivery country. Therefore, the final price may vary accordingly.

excl. 11.95 € shipping costs (DE)

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Product expected to be available from 26.02.2026

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Slightly used: TS-Optics GSO 6" f/12 Cassegrain telescope 154/1848 mm OTA

TS 6" f/12 Cassegrain telescope with fused Quartz mirror and only 38% obstruction - a good alternative to a Schmidt-Cassegrain

#TSCas6M: Display item with slight signs of wear

Aperture 6" - 154 mm

Focal length 1848 mm

F-ratio f/12

Large illuminated image field with 40 mm diameter

Hyperbolic secondary mirror and parabolic primary mirror made of Quartz glass for a stable focus position

96% 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 38% linear obstruction - well suited for visual astronomy

2" Crayford focuser with speed reduction and 1.25" reduction are included

M90 extension tubes for trouble-free focusing with almost any accessories included

Internal baffles for higher contrast

Finder scope shoe and Vixen GP style dovetail are also included

OTA, thus no mount in the scope of delivery

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Technical data..
In the box..
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TS-Optics GSO 6" f/12 Classical 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.

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

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 96% dielectric coating on primary and secondary mirror.

No shifting, because the primary mirror is fixated

High-quality 2" Crayford focuser with speed reduction and compression rings for 2" and 1.25" accessories

38% 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 500 mm length - can be operated with smaller mounts

Significantly less expensive than other classical Cassegrain telescopes!

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 and fitting your hand luggage.

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 38%. This is comparable to Schmidt-Cassegrain telescopes. As a result of the 96% reflection of primary and secondary mirror the image is significantly brighter. Even the field sharpness is better, because the image field is basically undistorted.

Telescope for astrophotography: The Cassegrain is very well suited for photography of the moon and the planets. The visual contrast 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 speed reduction the Crayford focuser permits precise focusing.

Astrophotographic results obtained with this telescope on Astrobin

Here you can find some astrophotographs made with this telescope model: Link to Astrobin

Optics:	Cassegrain optics with parabolic primary and hyperbolic secondary mirror
Aperture:	154 mm - 6"
Focal length:	1848 mm
F-ratio:	f/12
Reflectivity:	96% to primary and secondary mirror
Suitable for Infrared photography:	yes
Backfokus:	roughly 150 mm from the 2" receptacle
Tube diameter:	191 mm
Tube length:	roughly 500 mm
Weight:	5.4 kg
Secondary mirror obstruction:	38% (linear)
Focuser:	2" Crayford focuser with speed reduction
Connection-thread of the focuser:	M90x1 on the tube
Dovetail:	Vixen-GP (Skywatcher-EQ5) style

6" f/12 Cassegrain

2" focuser with reduction to 1.25"

Dovetail GP style

Dust protection cap for the focuser and front aperture

Finder shoe (mounted)

M90 extension tubes

German collimation manual

Astrophotographic results obtained with this telescope on Astrobin

Here you can find some astrophotographs made with this telescope model: Link to Astrobin

Manufacturer / Importeur:	Teleskop-Service Ransburg GmbH
Street:	Von-Myra-Str. 8
ZIP / City:	85599 Parsdorf
Country:	germany
Telefon number:	+49 89 99228750
Email:	info@teleskop-service.de
Website:	www.teleskop-express.de