ZWO FF65 - 65mm 416mm f/6.4 Petzval Refractor Telescope Quintuplet APO OTA

The smallest APO refractor in ZWO's line of refractor telescopes, the ZWO FF65 APO is differentiated from its larger relatives by featuring a 5-element, 3+2 air-spaced quintuplet lens design! Two lenses are made of extra-low dispersion (ED) glass to minimize chromatic and other aberrations. Its self-flattening design provides a flat field for imaging without the need of an additional field flattener accessory. Multiple included adapters give versatility to connecting a variety of cameras and other accessories to the scope. Finally, the 44 mm image circle supports full-frame camera sensors, for a larger field of view.

Main features

The ZWO FF65 APO is a refractive astrograph with a powerful flatfield optical design which saves you from the expensive cost of a field flattener. It eliminates the trouble of calculating the back focus distance of the flattener and any possible accessories you need. As long as the target is focused, the whole optical system is perfect for imaging. This makes the whole setting up process much more convenient, and saves your time, allowing you to pay more attention to the image shooting itself.

The ZWO FF65 APO is also a nice choice for your visual observation. It fits diagonals as well as various eyepieces and can achieve a perfect focus, and can even be used to observe planets with a super high magnification eyepiece.

The whole design of the telescope is compact and lightweight. The OTA weighs only 2kg, and the full package with tube rings and other accessories weighs 2.8kg. It has an aperture of 65mm. The focal ratio is f/6.4 and focal length is 416mm. Instead of the quadruplet structure of other ZWO FF APO telescopes, the ZWO FF65 APO is a quintuplet with two ED glasses which offers excellent control of chromatic and other aberrations.

The ZWO FF65 APO supports the full-frame imaging circle and has a fine spot diagram with tiny distortions of the peripheral stars. The 2.5" rigid focuser comes with a new type of 360 degree rotator with scales and a finder base. M68, M54, and M48 camera adapters are also attached, and the M48 adapter has a 2" female thread for installing filters.

Quintuplet air-spaced APO

The ZWO FF65 APO is a quintuplet with two ED glasses which offers excellent control of chromatic and other aberrations.

44mm image circle

The ZWO FF65 APO supports full frame cameras such as ASI6200 which gives you a larger field of view. The stars are small and round with a central RMS radius of 2.5um.

Self-flattening design

No need for a separate field flattener, the ZWO FF65 APO eliminates the trouble of calculating the back focus distance of the flattener and connecting various accessories to achieve that distance. You can just connect any possible accessories you need. As long as the target is focused, the whole optical system is perfect for imaging. 

Specifications

• Observing mode: 121mm
• Aperture size: 65mm
• Focal length: 416mm
• Focal ratio: f/6.4
• Net weight: 2kg
• Gross weight: 2.8kg
• Image circle: 44mm
• Objective lens: Quintuplet air-spaced APO (including two ED glass)
• Imaging mode:
  • 76mm (from the base of M48x0.75 male thread)
  • 105mm (from the base of M54x0.75 male thread)
  • 130mm (from the base of M61x1 male thread)
• Rear-end thread type:
  • M68x1-M54x0.75
  • M54x0.75-M54x0.75
  • M54x0.75-M48x0.75
  • (M48x0.75 filter thread inside)
• Total length:
  • 328mm (including 1.25" eyepiece holder as dew shield contracted)
  • 360mm (including the 3-piece adapter as dew shield contracted)
  • 388mm (including 1.25" eyepiece holder as dew shield fully stretched)
  • 420mm (including the3-piece adapter as dew shield fully stretched)
• Rear end of the 3-piece photographic adapters: M48x0.75

What's in the box

• ZWO FF65 APO
  • Tube rings with an integrated carrying handle
  • Vixen-style dovetail plate
  • Retractable dew shield
  • Large 2.5" dual-speed (1:10) rack-and-pinion focuser fully compatible with the ZWO EAF without additional adapters
• A set of 3-piece photographic adapters
• Manual