Vixen R200SS N 200/800 OTA

Description

Operating at a fast f/4.0 optical speed with an 800mm focal length, the Vixen R200SS N 200/800 OTA is a Japanese parabolic newtonian astrograph optical tube assembly built for high-speed deep-sky astrophotography. Sized with an unobstructed 200mm (7.87 in) clear aperture, this instrument delivers a 0.58 arcseconds theoretical resolving power and reaches magnitude 13.3, collecting photons rapidly on faint extended nebulae and large deep-sky structures.

The optical system features a fast parabolic primary mirror fabricated from precision annealed Japanese Pyrex low-expansion optical glass, treated with multi-layer vapor deposition dielectric enhanced aluminum coatings, paired with a 65mm secondary mirror producing a 32.5% central obstruction by diameter (10.6% by area). Built inside a solid rolled steel tube measuring 700mm in length with a 232mm outer diameter, the assembly provides 63.5mm of back focus from the M60 thread on optional dedicated Corrector PH lenses. Supported by a 2-inch heavy-duty dual-speed rack-and-pinion focuser with dual knobs, a tension brake, and M60 threads, this 5.30 kg (11.68 lbs) optical tube illuminates a 44mm full-frame image circle when paired with optional dedicated correctors.

Key Features of Vixen R200SS N 200/800 OTA

Engineered for high-resolution wide-field astro-imaging, this 200mm f/4.0 Newtonian pairs an annealed Pyrex mirror with a heavy-duty 2-inch rack-and-pinion focuser. Cast-aluminum tube rings, a top carrying handle, a standard Vixen dovetail plate, and a 7×50 finderscope provide a rigid imaging platform on medium-to-heavy tracking mounts.

• 200mm (7.87 in) clear aperture with 800mm focal length and fast f/4.0 optical speed
• Parabolic primary mirror made from precision annealed Japanese Pyrex low-expansion glass
• Multi-layer vapor deposition dielectric enhanced aluminum coatings for maximum reflectivity
• Moderate central obstruction of 32.5% by diameter (10.6% by area) for full sensor illumination
• 2-inch heavy-duty dual-speed rack-and-pinion focuser with tension brake and M60 threads
• Standard 63.5mm back focus distance measured from M60 thread on optional Corrector PH
• Corrected 44mm full-frame image circle when paired with dedicated Corrector PH optics
• Cast-aluminum tube rings, Vixen dovetail plate, top handle, and 7×50 finderscope included

Japanese Annealed Pyrex Primary & Fast f/4.0 Optical Figure

The parabolic primary mirror is figured from low-expansion Japanese Pyrex glass to resist thermal deformation during nocturnal ambient temperature drops. Multi-layer vapor deposition coatings maximize photon throughput across an all-reflective optical train, delivering pinpoint star profiles across full-frame sensors while supporting practical visual magnifications from 28.6x up to 400x.

Two-Inch Heavy-Duty Drawtube & M60 Photographic Interface

Carrying imaging camera trains without drawtube flexure is delivered through a 2-inch dual-speed rack-and-pinion focuser featuring dual knobs, an adjustable tension brake, and direct M60 accessory threading for dedicated coma correctors. Weighing 5.30 kg without accessories (7.20 kg with rings, handle, and finder), this optical tube assembly balances smoothly on equatorial mounts.

• 2-inch heavy-duty dual-speed rack-and-pinion focuser with tension brake to prevent drawtube slip
• Direct M60 threaded connection for rigid mechanical coupling of Corrector PH and camera adapters
• Cast-aluminum mounting rings with top carrying handle for balanced mount attachment

Vixen Made-in-Japan Astrograph Series 5-Year Warranty

The Vixen R200SS N 200/800 OTA is backed by a 5-year limited warranty against material and manufacturing defects. The complete factory package contains the R200SS optical tube, heavy tube mounting rings, Vixen dovetail plate, top carrying handle, and a 7×50 optical finderscope with bracket.