William Optics Zenithstar 81 ED Doublet APO Refractor Telescope - Gold Edition

The William Optics Zenithstar 81 is a premier refractor telescope, renowned for its versatility in both astrophotography and visual observation. This exquisite instrument is designed to provide stunningly sharp and clear images with minimal chromatic aberration, making it an ideal choice for astronomers and photography enthusiasts alike.

Exceptional Optical Performance

At the heart of the Zenithstar 81 is its advanced optical design. It features a two-element air-spaced construction, incorporating an Extra-low Dispersion (ED) element crafted from FPL-53 glass. This synthetic fluorite material, produced by the esteemed Ohara company in Japan, offers superior optical performance with an impressive Abbe number of 94.94. The telescope's lens surfaces are enhanced with SMC coatings, drastically reducing light reflections and enhancing image contrast. Despite its two-element design, the performance of this telescope rivals that of a full-fledged apochromat.

Robust and Versatile Design

The telescope tube is mounted on precision-engineered clamps with a Vixen socket, allowing for the seamless attachment of finders or guiders. It also features a versatile Vixen/Arca-Swiss foot, ensuring compatibility with various mounts and photographic tripods.

Key Features:

• Two-element air-spaced design with ED glass made of Japanese FPL-53 (synthetic fluorite).
• Durable rack & pinion focuser with both coarse and fine focus adjustment knobs.
• CNC-machined optical tube clamps for secure and precise mounting.
• Mounting foot compatible with Vixen and Arca-Swiss sockets.

Technical Specifications:

• Telescope optical system: ED doublet with air gap
• Lens diameter: 81 mm
• Focal length: 559 mm
• Aperture ratio: f/6.9
• Maximum usable magnification: 162x
• ED lens material: FPL-53 glass (Ohara, Japan)
• Optical system coating: SMC coating
• Compatible sensor sizes: APS-C, full frame
• Focuser: 2.5" Rack & pinion with dual-speed capability
• Thread for flattener/focal reducer: M63
• Finder foot: Vixen
• Mounting bracket: Vixen/Arca-Swiss
• Tube length (folded): 460 mm
• Tube length (unfolded): 560 mm
• Tube weight: 3.5 kg
• Tube finish: Plain white

Included Accessories:

• William Optics Zenithstar 81 refractor (white-gold color scheme)
• Dew shield
• Bahtinov mask with mount
• Lens cap
• Clamps with Vixen/Arca-Swiss foot

Warranty:

Enjoy peace of mind with a 24-month guarantee on the William Optics Zenithstar 81 telescope.