William Optics Zenithstar 81 f/6,9 OTA FPL53 doublet APO, 2,5 R&P focuser in gold (SKU: A-Z81GD) William Optics telescopes opinie

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William Optics Zenithstar 81 is one of the most recognizable constructions on the market designed for both astrophotography and visual observations.

Obtaining extremely sharp images with perfectly corrected chromatic aberration is the merit of advanced and precisely made optics. The construction of this refractor is a low-dispersion doublet with an air gap, in which the ED element is made of FPL-53 glass (synthetic fluorite). This material, produced by the Japanese company Ohara, is characterized by an extremely high value of the Abbe number (94.94), and is additionally much more chemically stable and easier to process than crystalline fluorite. The surfaces of the lenses have been additionally covered with the SMC coating, the role of which is to improve the contrast by eliminating possible light reflections. The combination of all these features means that, despite its two-element construction, this telescope is often described as a full-fledged apochromat.

The telescope tube is mounted on precisely made clamps, equipped with a Vixen socket for mounting a finder or guider, as well as a Vixen / Arca-Swiss foot.

Highlights of the William Optics Zenithstar 81 telescope

• doublet with an air gap and a low dispersion element made of Japanese FPL-53 glass (synthetic fluorite)
• solid rack & pinion hood equipped with coarse and fine focus adjustment knobs
• optical tube clamps made in CNC technology
• mounting foot compatible with Vixen and Arca-Swiss sockets, enabling the tube to be mounted on a mount or photographic tripod

Technical parameters

• telescope optical system: ED doublet with air gap
• Lens diameter: 81 mm
• focal length: 559mm
• light: 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"
• type of spectacle lift: rack & pinion, dual speed
• thread for connecting the 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: white - plain

Set elements

• William Optics Zenithstar 81 refractor (white-gold)
• dew
• Bahtinov mask with mount
• lens cap
• clamps with Vixen / Arca-Swiss foot

Guarantee

24 months