ZWO FF65 APO 65mm f/6.4 Astronomical Telescope, OTA Only

Main Features
• Quintuplet air-spaced APO design: No need to calculate back focus
• Small and round stars: with a central RMS radius of 2.5 microm
• Various adapter: M68/M54/M48
• Dual speed (1:10) focuser: Support both fine and coarse adjustment
• Self-flattening design: No need for a separate field flattener

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

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

44mm image circle
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 2.5 microm.

Self-flattening design
No need for a separate field flattener, 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.

Easy-to-use Design

Extension-type hood
ZWO FF65 APO is equipped with a telescopic lens hood, a high-quality CNC machined and painted tube. The lens hood can be fixed with thumb screws to avoiding from sliding.

Detachable tube ring
The telescope' s tube ring can be easily detached and re-installed in seconds.

Various adapters
The FF65 APO also features three different threaded connections for connecting a camera or accessories: M48, M54, and M68. The M48 adapter features a female thread inside for attaching 2" filters.

Coarse & fine focus adjustment
The ZWO FF65 APO features a large 2.5" rack and pinion focuser that is directly compatible with the ZWO EAF without the need for additional adapters. In front of the focuser is a 360-degree rotator for easily dialing in the framing of your deep sky object or imaging target.