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

TS-Optics GSO 10" f/12 Hyperbolic 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:

Well corrected 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" 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.

Generous backfocus allowing the use of 2" accessories.

Primary and secondary mirror are adjustable

The TS-Optics Cassegrain is a versatile telescope

Compact travel scope: Unlike the Newtonian, this Cassegrain can easily be transported in any car. There´s even room on the passenger seat.

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. 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.

Astrophotographic results obtained with this telescope on Astrobin

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

Jupiter images taken with the TS 10" Cassegrain telescope

We would like to thank our customer Dominique Dierick for the excellent images.

Astrophotographic results obtained with this telescope on Astrobin

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