Omegon Pro Astrograph 203/800 OTA

Description

Featuring an 8-inch quartz primary mirror at a fast f/4 focal ratio, the Omegon Pro Astrograph 203/800 OTA parabolic Newtonian optical tube assembly captures high-resolution deep-space exposures. Designed in Germany, this 203mm (7.99 inches) aperture instrument features an 800mm focal length, delivering 0.57 arcsecond Dawes resolving power and reaching magnitude 13.3 for astrophotographers.

The Omegon Pro Astrograph 203/800 OTA utilizes a zero-expansion quartz primary mirror treated with enhanced multi-layer aluminum coatings achieving 94% reflectivity. Its roll-formed heavy-gauge steel cylinder shell features cast aluminum cell framework rings, spring-loaded mirror cells, and active collimation lock bolts. Weighing 8.50 kg (18.74 lbs) with 230mm by 730mm dimensions, this fast f/4 astrograph OTA mounts onto equatorial saddles via a pre-mounted Vixen-style dovetail bar.

Key Features of Omegon Pro Astrograph 203/800 OTA

Built for high-speed prime-focus deep-sky imaging, this Omegon Pro 203mm astrograph OTA pairs a fast f/4 quartz mirror with a 2-inch monorail focuser. Its zero-expansion glass and rigid tube framework stabilize large cooled cameras without focal drift during long astrophotography runs.

• 203mm (7.99 inches) aperture with 800mm focal length and fast f/4 optical speed
• Premium quartz primary mirror substrate with near-zero thermal expansion index
• Enhanced multi-layer aluminum optical coatings achieving 94% enhanced reflectivity
• 70mm planar secondary mirror obstruction (34.48% diameter, 11.89% area)
• 2-inch linear guide dual-speed monorail focuser with 1:10 micro-gear reduction
• Active base collimation lock bolts and spring-loaded primary mirror cell
• CNC-machined tube ring set with pre-mounted Vixen-style dovetail plate
• Step-down 1.25-inch reduction adapter and 35mm focuser extension ring included

Fast f/4 Quartz Primary Mirror & 70mm Secondary Mirror

The quartz primary mirror eliminates thermal distortion as temperatures drop, while the 70mm secondary mirror ensures edge-to-edge illumination across camera sensors. With zero drawtube flexure, this fast Omegon Pro OTA supports visual and photographic magnifications from 29x up to 406x.

2-Inch Linear Monorail Focuser & CNC Rings

Carrying heavy filter wheels and cooled cameras requires a rigid focuser platform. The Omegon Pro Astrograph 203/800 OTA features a 2-inch monorail focuser with an integrated stainless steel rail that prevents drawtube flexure. Supported by CNC-machined tube rings and a Vixen dovetail, it integrates seamlessly into existing astronomy setups.

• 2-inch linear guide monorail focuser with smooth 1:10 planetary reduction gearing
• CNC-machined aluminum tube rings with pre-mounted Vixen-style dovetail bar
• Included 35mm extension ring and 1.25-inch adapter for versatile backfocus configurations

Omegon Pro Astrograph 203/800 OTA Warranty

The Omegon Pro Astrograph 203/800 OTA is backed by a 2-year limited warranty against material and manufacturing defects. The complete factory package contains the 203mm quartz Newtonian optical tube assembly, CNC tube rings, Vixen-style dovetail bar, 2-inch monorail focuser, 1.25-inch step-down reduction adapter, and a 35mm focuser extension ring.