ZWO FF80 80 mm f/7.5 Quadruplet Flatfield Super APO Astrograph

ZWO 80 mm f/7.5 APO Astrograph

The FF80 is a flatfield astrograph that joins the series that also includes the FF65, FF107 and FF130 models.

Optical Design

Instead of buying extra flatteners, calculating the back focus of the flattener, or making a tedious connection to set the correct distance, astrophotographers can simply equip the apochromat with all kinds of photographic accessories, keep the object in focus, and then the whole optical system is perfectly set for imaging.

High quality glass

The FF80 has a focal ratio of f/7.5 and a focal length of 600 mm. The FF80 is a quadruplet design with two ED glasses, which provides excellent control of chromatic and other aberrations. With its self-flattening design, the FF80 offers great advantages in astronomical imaging. It offers full-frame image circle and features a fine spot diagram with only tiny distortions of peripheral stars.

Practical Details

The FF80 comes with a retractable dew shield, a high-quality CNC-machined and painted tube, and decoratively designed parts. The OTA weighs 3.9 kg, and the total package with tube rings, etc. weighs 4.7 kg. The sturdy 3" focuser comes with a 360° rotator with scales and a finder shoe. M76, M68, M54 and M48 camera adapters are also included, and the M48 adapter has a female M48 thread for installing 2" filters.

Backfocus is always measured with the extension tube fully retracted:

115 mm from M48x0.75 male thread

135 mm as of M54x0.75 male thread

155 mm as of M68x1 male thread

168.5 mm as of M76x1 male thread