Apochromatic Telescope 203mm F/4 Astrograph for Astrophotography

Apochromatic telescope 203mm f/4 astrograph for astrophotography is a powerful, fast telescope for deep-sky photographers who want quick results. Thanks to the fast f/4 ratio and a parabolic primary mirror with 94% reflection, this astrograph captures faint nebulae and galaxies with short exposure times – without compromising detail or sharpness.

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

✓ Parabolic BK7 primary mirror (94% reflection) for bright, high-contrast images
✓ f/4 aperture ratio – shorter exposure, wider fields
✓ Large 70mm secondary mirror – full illumination for DSLR and CMOS cameras
✓ 2″ Crayford focuser with 1:10 micro reduction – suitable for heavy accessories
✓ 12V fan for faster cooling of the primary mirror

This astrograph is ideal for astrophotographers who want to capture extensive objects, such as the Orion Nebula, California Nebula, or Andromeda Galaxy – in relatively short sessions. Due to the wide field of view and tolerance for minor tracking errors, it’s particularly forgiving for beginners with guiding.

Application

• Deep-sky photography (nebulae, Milky Way fields, galaxies)
• Wide-field astrophotography with DSLR or dedicated astrocam
• Quick setups without heavy mount
• Visual use with 2″ wide-field eyepieces (optional)

What You Can See with It

✓ Faint emission nebulae like 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 detail

Filters / Specifications

• Telescope type: Reflector
• Optics: Newton (parabolic)
• Lens diameter: 203 mm
• Focal length: 800 mm
• Aperture ratio: f/4
• Focuser: Crayford 2″, 1:10 microfocuser
• Camera connection: 2 “+ 1.25” adapter
• Usage type: Astrophotography / visual wide-field
• Mount connection: Vixen-style dovetail
• Suitable for beginners: ✗
• Suitable for advanced users: ✓
• Suitable for observatories: ✗

Technical Specifications

• Primary mirror: parabolic BK7
• Reflection coating: 94% aluminum + SiO₂
• Secondary mirror: 70 mm (obstruction 35%)
• Mirror ventilation: 12V active
• Tube length: 710 mm
• Tube diameter: 230 mm
• Tube weight: 8.6 kg
• Material: steel
• Includes: tube rings, Vixen dovetail (22 cm), 2″ extension (35 mm), fan, 1.25″/2″ adapter
• Mount: OTA-only (mount not included)