The new ZWO FF APOs offer a series of mid-focal length refractors offering a modified flatfield Petzval quintuplet design that eliminates the need for a field flattener and are designed to offer wide views with pinpoint stars and flat corners. The telescopes have a dedicated reducer that converts them down from a mid-focal length to a short focal length scope.
The ZWO FF APOs includes two extra low dispersion glass elements which offer excellent correction of chromatic aberration. The Petzval design of the ZWO FF APOs eliminates the need to calculate the back focus distance of a field flattener providing the ability to use any filter wheel, any off-axis guider or other accessory without having to calculate the correct distance from the flattener.
All the lenses of the ZWO FF APOs are fully multi-coated and the tube is internally flocked to reduce reflections and absorb stray light. The tubes are made of CNC-machined aluminum, the rack and pinion focusing mechanisms are made of brass and the mechanical components are engineered to provide the best rigidity, performance and durability.
ZWO FF65
The ZWO FF65 offers a focal ratio of f/6.4 and an image circle of 44mm in diameter. The FF65 supports full frame cameras such as the ZWO ASI6200, with a central RMS radius of only 2.5 microns. The ZWO FF65 specifications include:
– Optical design: Apochromatic Quintuplet air-spaced
– Objective diameter: 65 mm
– Focal length: 416 mm
– Focal ratio: f/6.4
– Resolving power: 1.78 arc seconds
– Stellar limiting magnitude: 11.76
– Max. magnification: 162.5 x
– Light gathering power: 86.22 times the human eye
– Mount attachment: Vixen style dovetail plate (300 mm long)
– Focuser: Rack & pinion dual speed (10:1) 2.5″ diameter with 360-degree rotator with scales and finder base
– Included connection adapters: M68 x 1, M54 x 0.75, M48 x 0.75 (with 2″ filter thread)
– Backfocus: 130 mm from M68 thread, 105 mm from M54 thread, 76 mm from M48 thread
– Tube weight: 2.8 kg (including tube rings and dovetail bar)
– Tube diameter: 80 mm
– Dew shield diameter: 88 mm
ZWO FF80
The ZWO FF80 offers focal ratio of f/7.5 and an image circle of 44mm in diameter. The FF80 supports full frame cameras such as the ZWO ASI6200, with a central RMS radius of only 3 microns. The ZWO FF80 specifications include:
– Optical design: Apochromatic Quadruplet air-spaced
– Objective diameter: 80 mm
– Focal length: 600 mm
– Focal ratio: f/7.5
– Resolving power: 1.45 arc seconds
– Stellar limiting magnitude: 12.22
– Max. magnification: 200 x
– Light gathering power: 130 times the human eye
– Mount attachment: Vixen style dovetail plate (300 mm long)
– Focuser: Rack & pinion dual speed (10:1) 3″ diameter with 360-degree rotator with scales and finder base
– Included connection adapters: M76 x 1, M68 x 1, M54 x 0.75, M48 x 0.75 (with 2″ filter thread)
– Backfocus: 168.5 mm from M76 thread, 155 mm from M68 thread, 135 mm from M54 thread, 115 mm from M48 thread
– Tube weight: 4.7 kg (including tube rings and dovetail bar)
– Dew shield diameter: 120 mm
ZWO FF107
The ZWO FF107 offers a focal ratio of f/7 and an image circle of 44mm in diameter. The FF107 supports full frame cameras such as the ASI6200, with a central RMS radius of only 3 microns. The ZWO FF107 specifications include:
– Optical design: Apochromatic Quadruplet air-spaced
– Objective diameter: 107 mm
– Focal length: 749 mm
– Focal ratio: f/7
– Resolving power: 1.29 arc seconds
– Stellar limiting magnitude: 12.85
– Max. magnification: 267 x
– Light gathering power: 234 times the human eye
– Mount attachment: Vixen style dovetail plate (300 mm long)
– Focuser: Rack & pinion dual speed (10:1) 34″ diameter with 360-degree rotator with scales and finder base
– Included connection adapters: M86 x 1, M68 x 1, M54 x 0.75, M48 x 0.75 (with 2″ filter thread)
– Backfocus: 168.5 mm from M86 thread, 155 mm from M68 thread, 135 mm from M54 thread, 115 mm from M48 thread
– Tube weight: 6.9 kg (including tube rings and dovetail bar)
– Tube diameter: 123 mm
– Dew shield diameter: 138 mm
ZWO FF130
The ZWO FF130 offers a focal ratio of f/7.7 and an image circle of 60mm in diameter. The FF130 supports medium format cameras such as the ASI461MM Pro, with a central RMS radius of only 2 microns.
– Optical design: Apochromatic Quadruplet air-spaced
– Objective diameter: 130 mm
– Focal length: 1000 mm
– Focal ratio: f/7.7
– Resolving power: 1.06 arc seconds
– Stellar limiting magnitude: 13.27
– Max. magnification: 325 x
– Light gathering power: 344.9 times the human eye
– Mount attachment: Losmandy style dovetail plate (300 mm long)
– Focuser: Rack & pinion dual speed (10:1) 34″ diameter with 360-degree rotator with scales and finder base
– Included connection adapters: M86 x 1, M68 x 1, M54 x 0.75, M48 x 0.75 (with 2″ filter thread)
– Backfocus: 186 mm from M86 thread, 156 mm from M68 thread, 136 mm from M54 thread, 116 mm from M48 thread
– Tube weight: 12.5 kg (including tube rings and dovetail bar)
– Tube diameter: 146 mm
– Dew shield diameter: 162 mm
You can learn more about the new ZWO FF APOs here.
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