ZWO Apochromatic Refractor FF80 AP 80/600 Quadruplet OTA

The ZWO FF80 APO offers superb quality optics in a portable package. This 80mm scope is capable of producing amazing images of deep-sky objects! It is also a great choice for visual astronomy and can be even used to observe planets with high-power eyepieces.

The optical design of the scope offers excellent control of chromatic and other aberrations, producing razor sharp and high-contrast images. The scope comes with M76, M68, M54 and M48 adapters. The M48 adapter has a 2″ filter-thread so you can use filters without the need for a separate adapter.

The four element APO lens design produces high-contrast images free of aberrations. This scope doesn’t need a field flattener at all, producing 44mm corrected image-circle straight out-of-the box.

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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 it 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 1:7.5 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-stemming 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 cap, a high-quality CNC-machined and painted tube, and decoratively designed parts. The OTA weighs 3.9 kg, and the total package with tube clamps, 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