Cassegrain telescope 203mm f/12 OTA

Cassegrain telescope 203mm f/12 OTA for astrophotography and visual observation is designed for pure precision. With 203 mm aperture, an impressive 2436 mm focal length and a classic Cassegrain configuration, this telescope offers exceptional sharpness and contrast, perfect for high-res photography of planets, the moon and binary stars.

The f/12 ratio and closed design make this instrument ideally suited to observing locations with moderate seeing or high humidity. The tube is collimation-resistant and low-maintenance, with a more compact shape than a comparable refractor of the same focal length.

✓ 203 mm aperture - lots of light output for detailed observations
✓ f/12 focal ratio - ideal for planets, binary stars and lucky imaging
✓ Closed design - low sensitivity to dust and temperature fluctuations
✓ Compact tube shape - easier to mount than long refractors
✓ Exceptionally suitable for photography with barlow and planetary cameras

This telescope makes it easy to capture Saturn's Cassini edge, detail in Jupiter's cloud bands or the shadow of a moon during a transit. Visually, too, this is a powerful instrument for double-star enthusiasts and for high-magnification detail on the moon.

Application

• Photography of planets, the moon and binary stars
• High magnification visual observation
• Compact alternative to a long refractor (e.g. 150 mm f/15)
• Suitable for fixed installation, balcony observation or observatory use

What you can see with it

✓ Mars details at opposition, Saturn's rings and moons
✓ Jupiter transitions and Great Red Spot
✓ Sublime separation of binary stars up to 0.5″ separation
✓ Crater structures and rills on the moon at 300x magnification
✓ Visual observation without chromatic aberration

Filters / Properties

• Telescope type: Reflector
• Design: Classic Cassegrain
• Lens diameter: 203 mm
• Focal length: 2436 mm
• Opening ratio: f/12
• Focuser: 2″ connection (usually via adapter)
• Use Type: Planetary photography / double stars / moon
• Tripod connector: Vixen or Losmandy-style dovetail (depending on version)
• Suitable for beginners: ✗
• Suitable for advanced users: ✓
• Suitable for observatories: ✓

Technical specifications

• Optics: Classic Cassegrain with 2 mirrors
• Main mirror: Parabolic
• Secondary mirror: hyperbolic
• Coating: Alu + SiO₂ reflection coating
• Aperture: 203 mm
• Focal length: 2436 mm
• Tube length: approx. 600-650 mm
• Weight: ± 7-8 kg
• Construction: closed tube
• Focuser: mostly via rear connector with optional Crayford
• Included: OTA, dust cover, dovetail
• Mounting: not included