ZWO FF80 APO 80mm f/7.5 Astronomical Telescope, OTA Only

Main Features
• Quadruplet air-spaced APO design: No need to calculate back focus
• Small and round stars: Various adapter
• with a central RMS radius of 3um: M76/M68/M54/M48
• Dual speed (1:10) focuser: Self-flattening design
• Support both fine and coarse adjustment: No need for a separate field flattener

The ZWO FF80 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 FF80 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 3.9kg, and the full package with tube rings and other accessories weighs 4.7kg. It has an aperture of 80mm. The focal ratio is f/7.5 and focal length is 600mm.

The FF80 APO adopts a 3+1 quadruplet lens structure which contains two pieces of ED glass that can effectively reduce chromatic aberration and enhance clarity and sharpness. It supports the full-frame imaging circle and has a fine spot diagram with tiny distortions of the peripheral stars. The 3" rigid focuser comes with a new-type 360 Degree rotator with scales and a finder base. M76, M68, M54, and M48 camera adapters are also attached, and the M48 adapter has a 2" female thread for installing filters.

Quadruplet air-spaced APO
FF80 APO is a quintuplet with two ED glasses which offers excellent control of chromatic and other aberrations

44mm image circle
FF80 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, FF80 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 FF80 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 FF80 APO also features three different threaded connections for connecting a camera or accessories: M48, M54, and M68 and M76. The M48 adapter features a female thread inside for attaching 2" filters.

Coarse & fine focus adjustment
The ZWO FF80 APO features a large 3" 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.