ZWO Apochromatic Refractor FF107 AP 107/740 Quadruplet OTA

The ZWO FF107 APO offers superb quality optics for high-end astrophotography. This 107mm scope is capable of producing amazing images of deep-sky objects! It is also a great choice for visual astronomy and is a great choice for viewing planetswith 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 M86, 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.

ZWO 107 mm f/7 APO Astrograph
The FF107 is a flatfield astrograph that joins the series that also includes the FF65, FF80 and FF130 models.

Optical Design
Instead of buying additional 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 sorts of photographic accessories, hold the object in focus, and then the entire optical system is perfectly set for imaging.

High quality glass
The FF107 has a focal ratio of 1:7 and a focal length of 740 mm. The FF107 is a quadruplet design with two ED glasses, which provides excellent control of chromatic and other aberrations. With its self-stemming design, the FF107 offers great advantages in astronomical imaging. It offers more than full-frame image circle and has a fine spot diagram with only tiny distortions of peripheral stars.

Practical Details
The FF107 comes with a retractable dew cap, a high-quality CNC-machined and painted tube, and decoratively designed parts. The OTA weighs 5.7 kg, and the total package with tube clamps, etc. weighs 6.9 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.

The back focus is always measured with the focuser tube completely retracted:

♦ 79 mm from M48x0.75 male thread
♦ 99 mm from M54x0.75 male thread
♦ 119 mm from M68x1 male thread
♦ 149 mm from M86x1 male thread
♦ 120 mm from 2″ connection