The ZWO FF65 is a professional apochromatic flatfield Petzval quintuplet with a focal ratio of f/6.4 and an image circle of 44mm in diameter. The FF65 includes two Extra Low Dispersion glass elements for superb correction of chromatic aberration. The FF65 supports full frame cameras such as the ASI6200, with a central RMS radius of only 2.5 microns. Differently from standard ED refractors, the FF65 features a Petzval design that does not require to set the sensor to a specific distance to the last lens. That leaves the freedom to use any filter wheel, any off-axis guider or accessory without any worry to calculate the correct distance from the flattener. With a large 44mm image circle and a focal ratio of f/6.4, this is the perfect astrograph for the advanced astrophotographer. The large rack and pinion 2.5" focuser is natively compatible with the ZWO EAF without additional adapters, and can be rotated 360° to perfectly frame the subject and has a reduction gear of 10:1 for precise focusing. All the lenses are fully multi-coated and the tube is internally flocked to reduce reflections and absorb stray light. The tube is made of CNC-machined aluminium, the rack and pinion focusing mechanism of brass and the mechanical components are engineered to provide the best rigidity, performance and durability.
The ZWO FF65 is a professional apochromatic flatfield Petzval quintuplet with a focal ratio of f/6.4 and an image circle of 44mm in diameter. The FF65 includes two Extra Low Dispersion glass elements for superb correction of chromatic aberration. The FF65 supports full frame cameras such as the ASI6200, with a central RMS radius of only 2.5 microns. Differently from standard ED refractors, the FF65 features a Petzval design that does not require to set the sensor to a specific distance to the last lens. That leaves the freedom to use any filter wheel, any off-axis guider or accessory without any worry to calculate the correct distance from the flattener. With a large 44mm image circle and a focal ratio of f/6.4, this is the perfect astrograph for the advanced astrophotographer. The large rack and pinion 2.5" focuser is natively compatible with the ZWO EAF without additional adapters, and can be rotated 360° to perfectly frame the subject and has a reduction gear of 10:1 for precise focusing. All the lenses are fully multi-coated and the tube is internally flocked to reduce reflections and absorb stray light. The tube is made of CNC-machined aluminium, the rack and pinion focusing mechanism of brass and the mechanical components are engineered to provide the best rigidity, performance and durability.
ZWO FF65 APO QUINTUPLET f/6.4 - OTA ONLY
The ZWO FF65 is a professional apochromatic flatfield Petzval quintuplet with a focal ratio of f/6.4 and an image circle of 44mm in diameter. The FF65 includes two Extra Low Dispersion glass elements for superb correction of chromatic aberration. The FF65 supports full frame cameras such as the ASI6200, with a central RMS radius of only 2.5 microns. Differently from standard ED refractors, the FF65 features a Petzval design that does not require to set the sensor to a specific distance to the last lens. That leaves the freedom to use any filter wheel, any off-axis guider or accessory without any worry to calculate the correct distance from the flattener. With a large 44mm image circle and a focal ratio of f/6.4, this is the perfect astrograph for the advanced astrophotographer. The large rack and pinion 2.5" focuser is natively compatible with the ZWO EAF without additional adapters, and can be rotated 360° to perfectly frame the subject and has a reduction gear of 10:1 for precise focusing. All the lenses are fully multi-coated and the tube is internally flocked to reduce reflections and absorb stray light. The tube is made of CNC-machined aluminium, the rack and pinion focusing mechanism of brass and the mechanical components are engineered to provide the best rigidity, performance and durability.
The ZWO FF65 is a professional apochromatic flatfield Petzval quintuplet with a focal ratio of f/6.4 and an image circle of 44mm in diameter. The FF65 includes two Extra Low Dispersion glass elements for superb correction of chromatic aberration. The FF65 supports full frame cameras such as the ASI6200, with a central RMS radius of only 2.5 microns. Differently from standard ED refractors, the FF65 features a Petzval design that does not require to set the sensor to a specific distance to the last lens. That leaves the freedom to use any filter wheel, any off-axis guider or accessory without any worry to calculate the correct distance from the flattener. With a large 44mm image circle and a focal ratio of f/6.4, this is the perfect astrograph for the advanced astrophotographer. The large rack and pinion 2.5" focuser is natively compatible with the ZWO EAF without additional adapters, and can be rotated 360° to perfectly frame the subject and has a reduction gear of 10:1 for precise focusing. All the lenses are fully multi-coated and the tube is internally flocked to reduce reflections and absorb stray light. The tube is made of CNC-machined aluminium, the rack and pinion focusing mechanism of brass and the mechanical components are engineered to provide the best rigidity, performance and durability.
in 8 offers
The lowest price for ZWO FF65 APO QUINTUPLET f/6.4 - OTA ONLY right now is $1,090.18 at TS2 Space, compared across 5 retailers.
The all-time low was $1,090.18 on 3 Nov 2026. That's the lowest price we've ever tracked — a great time to buy.
Prices last updated 3 Nov 2026.
Last updated at 03/11/2026 12:04:51
ZWO FF65-APO 65 mm F/6,4 quintuplet (84191) - Optics
Delivery $2.87
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ZWO FF65-APO Telescope OTA
Free delivery between 4–10 Nov
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ZWO FF65 - 65mm 416mm f/6.4 Petzval Refractor Telescope Quintuplet APO OTA
Free delivery between Wed – Sat
| Type | Refractor |
| Brand | ZWO |
| Focal Ratio | f/6.4 |
ZWO FF65-APO 65 mm F/6,4 quintuplet (84191) - Optics
Delivery $2.87
ZWO FF65 APO QUADRUPLET F6.4
ZWO FF65-APO Telescope OTA
Free delivery between 4–10 Nov
Zwo Ff65 65mm Apo Achromatic Self Flat Field Telescope Refractive
Delivery $24.39
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
ZWO FF65 - 65mm 416mm f/6.4 Petzval Refractor Telescope Quintuplet APO OTA
Free delivery between Wed – Sat
| Type | Refractor |
| Brand | ZWO |
| Focal Ratio | f/6.4 |
