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8096 EUR
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price without VAT: 6582 EUR
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The William Optics Ultra-Cat 131 WIFD is the flagship astrograph of the Ultra-Cat series, designed for advanced wide-field astrophotography. Its 5-element Petzval optical design with a 131 mm aperture and 648 mm focal length provides a flat field without requiring an additional flattener, while the fast f/4.9 focal ratio is well suited for capturing extended deep-sky objects. The large 60 mm image circle supports both full-frame and selected medium-format sensors.
• 5-element advanced Petzval design providing a flat field without an additional flattener
• 131 mm aperture and 648 mm focal length
• f/4.9 focal ratio suitable for deep-sky astrophotography
• 60 mm image circle
• internal WIFD Rack & Pinion focuser with 0-20 mm travel
• focuser compatible with EAF motor focus systems
• integrated Sensor Tilt Xterminator and CAA camera rotator
• built-in Bahtinov mask integrated into the lens cover
• Anti-Shrink Lens Cell technology minimizing the impact of temperature changes on optical alignment
• compatible with camera formats: Medium Format, Full Frame, APS-C, M4/3
• no additional flattener required
• William Optics Ultra-Cat 131 WIFD telescope
• retractable dew shield (105 mm)
• lens cover with built-in Bahtinov mask
• front Bahtinov mask cover
• integrated Sensor Tilt Xterminator with CAA rotator
• camera adapters: M79 - M68, M79 - M54, M79 - M48
• M48 / M54 / M68 rear dust cap
• handle bar with mini Vixen-style mounting base
• mounting rings
• 20 mm riser blocks
• 400 mm Losmandy-style dovetail plate
• mounting hardware set and H4 set screw for off-axis guider use
• manufacturer: William Optics
• SKU: T-C-131BR
• optical design: 5-element Advanced Petzval
• aperture: 131 mm
• focal length: 648 mm
• focal ratio: f/4.9
• image circle: 60 mm
• glass types: Super ED x2, ED x1, Lanthanum x1, X-Element x1
• focuser: WIFD Rack & Pinion
• focuser travel: 0-20 mm
• flattener required: no
• included adapters: M79 - M68, M79 - M54, M79 - M48
• supported sensor formats: Medium Format, Full Frame, APS-C, M4/3
• supported camera mounts: Canon EF, RF; Nikon F, Z; Sony E; Pentax K; MFT (M4/3); FUJI X
• dovetail type: Losmandy
• tube length: 650-785.5 mm
• OTA weight: 11.3 kg
• total weight: 13.97 kg
The William Optics Ultra-Cat 131 WIFD is an advanced astrograph combining large aperture, fast optics and robust mechanics in a system ready for use with modern astronomical cameras.
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