William Optics RedCat 71 WIFD APO f/4.9
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Vai al moduloWilliam Optics RedCat 71 APO f/4.9 – Imaging Astrograph with Internal WIFD Focuser
The RedCat 71 APO WIFD is a high-precision compact astrograph designed for both professional and mobile astrophotographers. Its 4-element Petzval optical design with FPL-53 glass ensures a perfectly flat, sharp, and color-corrected image field across full-frame sensors, with no need for field flatteners or backfocus calculations.
At the core of this instrument is the revolutionary William Optics Internal Focus Design (WIFD): a fully integrated and ultra-stable focusing system that is directly compatible with ZWO EAF autofocus motors, with no need for adapters. The dual-speed manual focuser includes a built-in analog thermometer to monitor temperature shifts during imaging sessions.
Designed as a true all-in-one imaging solution, the RedCat 71 combines mechanical precision, portability, and optical excellence. Key features include:
- Adjustable tilt adapter with 12-point calibration for perfect sensor alignment
- Built-in 2" filter holder with easy access
- Integrated Bahtinov mask inside the objective lens cap for precise focusing
- Mounting rings with a 210 mm Vixen-style dovetail and CAT handle with Synta-style accessory bar
- Padded carrying case included for safe storage and transport
With a 348 mm focal length and a fast f/4.9 focal ratio, the RedCat 71 is ideal for capturing deep-sky objects such as galaxies, nebulae, and wide Milky Way vistas—even with lightweight mounts or travel setups.
Technical Specifications
- Optical Design: 4-element Petzval refractor
- Glass Type: FPL-53
- Aperture: 71 mm (2.8")
- Focal Length: 348 mm
- Focal Ratio: f/4.9
- Image Circle: 45 mm (Full Frame compatible)
- Focuser Type: Internal WIFD by William Optics
- Autofocus Compatibility: ZWO EAF (no adapter required)
- Tilt Adjustment: Integrated, 12-point system
- Filter Holder: Built-in, threaded for 2" filters
- Focus Control: Dual-speed with analog thermometer
- Dew Shield Diameter: 105 mm (4.1")
- OTA Weight: 4.3 kg (9.47 lbs)
- Dovetail Plate: Vixen-style, 210 mm
- Included Accessories: Mounting rings, CAT handle with Synta bar, Bahtinov mask, padded carrying case
The RedCat 71 is the ideal instrument for advanced astrophotographers seeking professional-grade performance in a compact, travel-ready form—with no compromises on image quality or mechanical stability.