TS-Optics 8" f/12 Cassegrain 203/2436 mm
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TS-Optics Cassegrain 8" f/12: the superior alternative to the Schmidt-Cassegrain
The TS-Optics Cassegrain 8" f/12 combines the advantages of a pure reflective system — without Schmidt plate or meniscus lens — with a compact design and superior optical performance. Featuring a parabolic primary mirror and a hyperbolic secondary mirror made from fused quartz glass, it delivers stable focus, a brighter image (99% reflectivity on both mirrors) and a flat, well-corrected image field up to APS-C sensor format. Ideal for visual observation, planetary and lunar photography, and — with modern CMOS cameras — even deep-sky imaging.
Key advantages over Schmidt-Cassegrain
- Pure reflective system: suitable for infrared photography at full resolution
- Faster temperature adaptation thanks to open design (no front plate)
- No mirror shift: the primary mirror is fixed
- Brighter image thanks to 99% dielectric coating on primary and secondary mirror
- Flatter field than SC: reduced field curvature
- Less dew problems: no front plate to fog up
- Only 33% linear obstruction: excellent for visual astronomy
- Interior baffles for high contrast and stray light suppression
- Large backfocus (~150mm from the 2" receptacle) for 2" accessories
Applications
- Travel telescope: compact tube (620mm), lightweight (7.5 kg), focuser removable in seconds
- Visual astronomical observation: bright, contrasty image, corrected field, compatible with 2" and 1.25" accessories
- Planetary and lunar photography: high contrast, anti-stray light baffles, Crayford focuser with micro-gear reduction for precise focusing
- Deep-sky imaging: with modern sensitive CMOS cameras, no additional corrector lenses needed up to APS-C format
Technical specifications
| Optics | Cassegrain: parabolic primary + hyperbolic secondary mirror |
|---|---|
| Aperture | 203 mm (8") |
| Focal length | 2,436 mm |
| F-ratio | f/12 |
| Illuminated field | 45 mm diameter |
| Mirror material | Fused quartz glass |
| Reflectivity | 99% on primary and secondary (dielectric coating) |
| Secondary obstruction | 33% (linear) |
| Backfocus | ~150 mm from the 2" receptacle |
| Tube diameter | 230 mm |
| Tube length | ~620 mm |
| Weight | 7.5 kg |
| Focuser | 2" Crayford MONORAIL with micro-gear reduction |
| Focuser reduction | 1.25" |
| Focuser thread | M90×1 |
| Collimation | Central marks on secondary mirror |
| IR photography | Yes |
| Dovetails | Vixen/EQ5 + Losmandy |
In the box
- 8" f/12 Cassegrain
- 2" focuser with 1.25" reduction
- Vixen/GP style and Losmandy style dovetail bars
- Dust caps for focuser and front aperture
- Finder shoe (mounted)
- M90 extension tubes
- Collimation manual