William Optics Zenithstar 81 WIFD f/6.9 OTA APO doublet with 2.5 R&P focuser (color: gold; SKU: T-ZS-81GD-WIFD) William Optics telescopes opinie

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William Optics ZenithStar 81 WIFD is a compact apochromatic refractor designed for astrophotography and visual observation. This model stands out with its patented WIFD internal focusing system, which helps maintain the optical system alignment even when working with heavier cameras. An 81 mm aperture, 559 mm focal length, and f/6.9 focal ratio make this telescope well suited as a portable instrument for wide-field imaging, while also remaining convenient in everyday use.

Main features

• doublet APO apochromatic refractor for astrophotography and visual observation
• 81 mm aperture, 559 mm focal length, and f/6.9 focal ratio
• patented WIFD internal focusing system
• 2.5" WIFD R&P focuser compatible with EAF
• focuser travel range 0-77 mm, with a scale up to 90 mm
• 45 mm image circle
• suitable for Full Frame, APS-C, and Micro 4/3 sensors
• M92 Camera Angle Rotator (CAA)
• M92 → M63 adapter included
• compatibility with the FLAT6AIII 0.8x flattener / reducer
• retractable dew shield with locking screw
• dual-speed focusing system with 1:10 ratio
• focuser knob with built-in temperature gauge
• handle bar with mini Vixen-style mounting base
• dual side plate in the Vixen / Arca-Swiss standard
• Bahtinov mask integrated with the front lens cover
• compact transport-friendly design with a soft carrying case included
• color: gold

Kit contents

• William Optics ZenithStar 81 WIFD optical tube
• front lens cover with Bahtinov mask
• M92 → M63 adapter
• dual side Vixen / Arca-Swiss plate
• mounting ring with handle bar
• soft carrying case
• Allen key set

Technical specifications

• manufacturer: William Optics
• model: ZenithStar 81 WIFD
• color: gold
• SKU: T-ZS-81GD-WIFD
• type: apochromatic refractor, Doublet APO Prime Lens
• aperture: 81 mm
• focal length: 559 mm
• focal ratio: f/6.9
• image circle: 45 mm
• focuser: 2.5" WIFD R&P, compatible with EAF
• focuser travel range: 0-77 mm
• focuser scale: up to 90 mm
• included adapters: M92 Rotator, M92 → M63 Adapter
• optional flattener / reducer: FLAT6AIII 0.8x
• supported sensor format: Full Frame, APS-C, Micro 4/3
• dovetail type: Vixen / Arca-Swiss
• tube length: 526 mm - 607 mm
• OTA weight: 3.55 kg
• total weight: 4.56 kg