William Optics ZenithStar 81, f/6.9 OTA. FPL53 doublet APO, 2.5” R&P Focuser Refractor

•     81 mm Aperture f/6.9 Imaging Refractor Telescope
•     FPL-53 glass for color free Apochromatic performance
•     Covers full frame imaging circle (44 mm)
•     2.5" R & P Focuser
•     Colors: 3 colors available, Blue, Red, Gold
•     Includes Mounting rings and Vixen style dovetail
•     Dovetail is dual type - flip over to get Arca Swiss plate
•     Weight: 3.53 kg
•     Includes Interchangable Camera Mount
•     Includes Dust Cover with built-in Bahtinov Mask

The William Optics ZenithStar 81 APO Telescope is a high quality Apochromatic Imaging and visual use telescope with an aperture of 81 mm and a focal length of 559 mm or an f-ratio of f/6.9. This ZenithStar 81 APO Telescope can also be used with an interchangable camera mounting system, with various T-mounts for cameras (not included).

The William Optics ZenithStar 81 APO Refractor is available in three colors, Blue, Red, or Gold. Choose the color of the telescope you wish to order from the drop-down menu above. All models have the same price.

If you wish to take great astro-images with a high quality APO refractor, this William Optics ZenithStar 81 APO Telescope is a great way to obtain your imaging goals. Its FPL-53 glass air-spaced doublet lens design provides images with extreme sharpness, clear details, with APO grade color correction.

Includes a dual-spec Mounting Base (Vixen & Arca Swiss), 2.5" Dual-speed Rack and Pinion Focuser, CNC Carry Handle (with easy mount design for the optional guiding scope), clamshell type Mounting Rings for telescope, and the new innovative Bahtinov Mask cover. And this gem of a telescope is relatively small and easy to store or transport.

Introducing a first innovative feature in the industry: Now this ZenithStar 81 APO Telescope from William Optics comes standard with a dust cover that has a built-in, clear Bahtinov Mask for perfect focusing every time. Simply remove the flat front cover plate, leaving the dust cover cuff in place on the telescope. Point the telescope at a bright star, and focus carefully. When the bright central diffraction spike looks exactly centered between the other two spikes forming an "X", then your telescope is in exact focus for stars. Remove the dust cover cuff carefully from the objective end of the telescope, and you are ready to image.

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