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1149 EUR
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price without VAT: 934 EUR
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 Shop online:
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Shop in Warsaw (qty): 1
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The ZWO FF90 APO is a flat-field apochromatic astrograph with a 90 mm aperture, 609 mm focal length and f/6.8 focal ratio. The optical tube has been designed as a universal refractor for astrophotography and visual observation. The four-element air-spaced optical system includes one ED glass element, which helps effectively reduce chromatic aberration and provides a well-corrected image across a wide field.
The flat-field design includes built-in field correction, so the telescope does not require an additional field flattener. The 44 mm image circle allows the telescope to work with full-frame cameras. Unlike typical setups with an external corrector, the FF90 APO does not require one strictly defined working distance such as 55 mm. Focus is achieved within the focuser travel range and the permitted rear optical path length.
The telescope is equipped with a 3" rack-and-pinion focuser with a precise 1:10 microfocuser and a 360° rotator, allowing convenient frame adjustment without removing the camera. The retractable dew shield reduces the tube length during transport. The tube rings with carrying handle and quick-release system make installation easier, while the 230 mm Vixen-style dovetail plate includes 1/4"-20 and 3/8"-16 mounting holes.
• four-element apochromatic optical system with air-spaced elements
• one ED glass element
• 90 mm aperture and 609 mm focal length
• f/6.8 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
• 3" rack-and-pinion focuser with 1:10 microfocuser
• 360° rotator with locking screw
• retractable dew shield
• quick-release tube rings
• carrying handle on the tube rings
• dual finder scope / accessory mounting system
• 230 mm Vixen dovetail plate
• 1/4"-20 and 3/8"-16 mounting holes in the dovetail plate
• photographic adapters with M54 × 0.75 and M48 × 0.75 threads
• possibility of mounting a 2" filter in the M48 adapter
• compatible with astronomical cameras, DSLR cameras, mirrorless cameras, OAG, filter drawer and visual setups
• ZWO FF90 APO optical tube
• tube rings
• carrying handle
• 230 mm Vixen dovetail plate
• photographic extension tube with adapters
• user manual
• warranty card
• quality control card
• manufacturer: ZWO
• model: FF90 APO
• telescope type: flat-field apochromatic astrograph
• optical design: quadruplet APO with air-spaced elements
• number of optical elements: 4
• ED glass: one ED lens
• objective diameter: 90 mm
• focal length: 609 mm
• focal ratio: f/6.8
• image circle: 44 mm
• full-frame support: yes
• focuser: 3" rack-and-pinion, dual-speed
• microfocuser: 1:10
• rotator: 360°
• maximum optical path length in imaging mode: 75 mm from the base of the M48 × 0.75 thread; 93 mm from the base of the M54 × 0.75 thread
• maximum optical path length in visual mode: 112 mm from the end of the 1.25" holder; 122 mm from the end of the 2" holder
• total length with 1.25" adapter and retracted dew shield: 513 mm
• total length with 1.25" adapter and extended dew shield: 599 mm
• total length with photographic adapter and retracted dew shield: 550 mm
• total length with photographic adapter and extended dew shield: 636 mm
• rear threads / adapters: M64 × 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: 230 mm
• dovetail standard: Vixen
• optical tube net weight: 3.92 kg
• weight with tube rings, handle and dovetail plate: 4.52 kg
The ZWO FF90 APO is a good choice for users looking for more aperture than the smallest mobile tubes can offer, while still expecting a compact and easy-to-transport astrograph with full-frame field correction.
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