Cassegrain Classic 203/2436 1:10 OTA Telescope
This telescope handles both visual observation and astrophotography without compromise. The Cassegrain optical design with a focal ratio of f/10 delivers a long effective focal length in a very compact tube - a practical choice when image accuracy and ease of use both matter.
Parabolic primary mirror with minimal thermal expansion
The parabolic primary mirror is made from low thermal expansion quartz glass. This means the mirror holds its shape even when temperatures shift significantly during the night. The reflective coatings reach 94% reflectivity, so light reaches your eyepiece or camera with minimal loss.
Hyperbolic secondary mirror for better contrast
The secondary hyperbolic mirror is designed with a smaller obstruction than is typical for this type of optics. The result is higher contrast and sharper detail - whether you are studying planetary surfaces or capturing distant nebulae in long exposures.
Internal baffles for clean, high-contrast images
The inner walls of the tube are fitted with circular baffles that suppress reflections from the tube walls. This design directly improves contrast and image clarity, especially when observing objects with a strong difference in brightness.
2″ Monorail focuser - ready for visual use and astrophotography
The 2″ Monorail focuser accepts standard eyepieces in both 2″ and 1.25″ sizes. The M90x1 thread also allows you to connect a wide range of photographic adapters. This makes it straightforward to integrate the telescope into your existing setup - no special accessories required.
Technical specifications
| Parameter |
Value |
| Optical design |
Cassegrain |
| Aperture |
203 mm |
| Focal length |
2436 mm |
| Focal ratio |
f/10 |
| Primary mirror |
Parabolic, low thermal expansion quartz glass |
| Secondary mirror |
Hyperbolic |
| Mirror reflectivity |
94% |
| Focuser |
2″ Monorail |
| Focuser thread |
M90x1 |
| Eyepiece compatibility |
2″ and 1.25″ |
| Product type |
OTA (optical tube assembly only) |
Who is this telescope for?
The Cassegrain Classic 203/2436 suits observers and photographers who want a long focal length instrument that is compact enough for regular use. The combination of a quartz primary mirror, high-reflectivity coatings, and a versatile 2″ focuser makes it a capable choice for planetary work and deep-sky imaging alike. The tube is sold as an OTA - you will need a suitable mount and eyepieces to complete your setup.
Specifications
Type of telescope:
Newton reflectors
Optical scheme:
Cassegrain
Focal length:
2436 mm
Aperture:
203 mm (8″)
Aperture ratio:
12
Limit value:
14.7 magnitude
Light gathering capacity:
841x
Product range:
Pro CC
Max. useful magnification:
406x
Connection type:
2″
Mounting:
No mount
Recommended for:
Advanced, Experienced
Application area:
Astrophotography, Deep Sky observation, Planets observation
Package contents of "Cassegrain Classic 203/2436 1:10 OTA Telescope":
✅ Cassegrain 8″ OTA telescope
✅ Vixen rail
✅ Losmandy rail (3″)
✅ Reducer (adapter) 2″/1.25″
✅ Extension tube M90x1 50mm
✅ Extension tube M90x1 25mm (2pcs)
Typical magnifications
The recommended magnification is highlighted in yellow.
D = telescope aperture in millimeters
