Apochromatic telescope 203mm f/4 astrograph for astrophotography

Apochromatic telescope 203mm f/4 astrograph for astrophotography is a powerful, bright telescope for deep-sky photographers who want fast results. With a fast f/4 ratio and a parabolic main mirror with 94% reflectance, this astrograph captures faint nebulae and galaxies with short exposure times - without sacrificing detail or sharpness.

The 8-inch aperture provides ample light capture for high-res astrophotos, while the compact design (only 71 cm tube length) works surprisingly well on an EQ5 or similar mount. This model combines brute optical power with practical mobility.

✓ Parabolic BK7 main mirror (94% reflection) for clear, high-contrast image
✓ f/4 aperture ratio - shorter exposure, wider fields
✓ Large 70 mm capture mirror - full exposure for DSLR and CMOS cameras
✓ 2″ Crayford focuser with 1:10 microreduction - suitable for heavy accessories
✓ 12V fan for faster cooling of the main mirror

This astrograph is ideal for astrophotographers who want to capture vast objects, such as the Orion Nebula, California Nebula or Andromeda Galaxy - in relatively short sessions. Its wide angle of view and tolerance for small tracking errors make it particularly forgiving for novice photographers with guiding.

Application

• Deep-sky photography (nebulae, galaxy fields, galaxies)
• Widescreen astrophotography with DSLR or dedicated astrocam
• Fast set-ups without a heavy mount
• Visual use with 2″ wide field eyepieces (optional)

What you can see with it

✓ Faint emission nebulae such as the Veil Nebula or IC 1805
✓ Structure in spiral arms of galaxies (M33, M101)
✓ Bright globular clusters (M13) and open clusters (NGC 869/884)
✓ Wide-field images without vignetting (when using coma corrector)
✓ Moon and planets at high magnification - with sharp edge details

Filters / Properties

• Telescope type: Reflector
• Optics: Newton (parabolic)
• Lens diameter: 203 mm
• Focal length: 800 mm
• Opening ratio: f/4
• Focuser: Crayford 2″, 1:10 microfocuser
• Camera connection: 2″ + 1.25″ adapter
• Use Type: Astrophotography / visual widescreen
• Tripod connector: Vixen-style dovetail
• Suitable for beginners: ✗
• Suitable for advanced users: ✓
• Suitable for observatories: ✗

Technical specifications

• Main mirror: parabolic BK7
• Reflective coating: 94% aluminum + SiO₂
• Front mirror: 70 mm (35% obstruction)
• Mirror ventilation: 12V active
• Tube length: 710 mm
• Tube diameter: 230 mm
• Tube weight: 8.6 kg
• Material: steel
• Included: tube rings, Vixen swallowtail (22 cm), 2″ extension piece (35 mm), fan, 1.25″/2″ adapter
• Mounting: OTA-only (no mount included)