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2407 EUR
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price without VAT: 1957 EUR
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 Shop online:
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The ZWO FF131 APO is a large flat-field apochromatic astrograph with a 131 mm aperture, 983 mm focal length and f/7.5 focal ratio. The optical tube is intended for deep-sky astrophotography and visual observation. The four-element APO optical system with air-spaced elements includes one ED glass element and has been designed to provide a corrected image field for full-frame cameras.
The flat-field design includes built-in field correction, so the FF131 APO does not require an additional field flattener. The 44 mm image circle allows the use of full-frame sensors, while the lack of a rigid 55 mm backfocus requirement makes it easier to configure the photographic optical train. In imaging mode, focus can be achieved with an effective optical path length of 42-73 mm from the M48 × 0.75 thread or 60-91 mm from the M54 × 0.75 thread.
The telescope is equipped with a 3" rack-and-pinion focuser with a 1:10 microfocuser, a 360° rotator and an extended rear photographic adapter system with M78, M54 and M48 threads. The retractable dew shield with locking screw reduces the tube length during transport, while internal baffles help suppress stray light. The set includes a 300 mm Losmandy dovetail plate designed for stable mounting of the larger optical tube.
• four-element apochromatic optical system with air-spaced elements
• one ED glass element
• 3+1 optical design - three elements in the front and one element at the rear of the system
• 131 mm aperture and 983 mm focal length
• f/7.5 focal ratio
• integrated flat-field correction
• no additional field flattener required
• 44 mm image circle, suitable for full-frame sensors
• no rigid 55 mm backfocus requirement typical of external field correctors
• internal baffles suppressing stray light
• retractable dew shield with locking screw
• 3" rack-and-pinion focuser with 1:10 microfocuser
• 360° rotator with locking screw
• photographic adapters with M78 × 1, M54 × 0.75 and M48 × 0.75 threads
• possibility of mounting 2" filters in the M48 × 0.75 adapter
• 1.25"/2" visual adapter for visual observation
• dual finder scope / accessory mounting system
• carrying handle on the tube rings
• quick-release tube rings
• 300 mm Losmandy dovetail plate
• focuser mounting holes prepared for electric focuser bracket installation
• compatible with astronomical cameras, DSLR cameras, mirrorless cameras, OAG, filter drawer, focal plane adjuster and M48 extension tubes
• ZWO FF131 APO optical tube
• pair of tube rings
• carrying handle
• 300 mm Losmandy dovetail plate
• four-section photographic adapter set
• user manual
• warranty card
• quality control card
• manufacturer: ZWO
• model: FF131 APO
• telescope type: flat-field apochromatic astrograph
• optical design: quadruplet APO with air-spaced elements
• lens arrangement: 3 elements in the front and 1 element at the rear
• number of optical elements: 4
• ED glass: one ED lens
• objective diameter: 131 mm
• focal length: 983 mm
• focal ratio: f/7.5
• image circle: 44 mm
• full-frame support: yes
• focuser: 3" rack-and-pinion, dual-speed
• microfocuser: 1:10
• focuser travel: 31 mm
• rotator: 360°
• optical path length range in imaging mode: 42-73 mm from the base of the M48 × 0.75 thread; 60-91 mm from the base of the M54 × 0.75 thread
• optical path length range in visual mode: 100-131 mm from the end of the 1.25" holder; 110-141 mm from the end of the 2" holder
• total length with 1.25" adapter and retracted dew shield: 878 mm
• total length with 1.25" adapter and extended dew shield: 963 mm
• total length with photographic adapter and retracted dew shield: 941 mm
• total length with photographic adapter and extended dew shield: 1026 mm
• dew shield extension length: 85 mm
• outer diameter of the lens cap: 163 mm
• outer diameter of the dew shield: 157 mm
• outer diameter of the tube section behind the dew shield: 125 mm
• rear threads / adapters: M78 × 1 - 55 mm adapter; M78 × 1 to M54 × 0.75; M54 × 0.75 to M54 × 0.75; M54 × 0.75 to M48 × 0.75
• filter thread: M48 × 0.75 in the M48 adapter
• dovetail plate length: 300 mm
• dovetail standard: Losmandy
• optical tube net weight: 7.9 kg
• weight with tube rings, handle and dovetail plate: 9.4 kg
The ZWO FF131 APO combines large aperture, long focal length, full-frame field correction and a stable mechanical system. It is an optical tube designed for demanding astrophotography, where image scale, field correction and convenient integration with astronomical cameras and imaging accessories are essential.
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