ZWO FF110 APO Flat-Field Apochromatic Refractor

Article number:	ZWO FF110-APO
Availability:	More on the Way to us
Delivery time:	More on the Way to Us

Lightweight, compact, and engineered for both immersive visual observing and high-performance astrophotography.

*Focus can be achieved within a back focus range of 42–73 mm, measured from the M54–M48 interface shoulder.

Main Features

Flexible Connectivity for Multiple Configurations

Uniqueness

1. Four-Element Optical Design

The FF110 APO features a four-element, fully air-spaced apochromatic optical design. All four elements work together to deliver a flat imaging field without the need for an additional field flattener.
One ED (extra-low dispersion) glass element is incorporated to effectively reduce chromatic aberration, resulting in improved color correction and image clarity.

2. 44 mm Image Circle — Full-Frame Support

With a 44 mm image circle, the FF110 APO fully supports full-frame sensors and a wide range of imaging setups.
It delivers sharp star fields with excellent edge-to-edge performance, ensuring consistent image quality across the entire frame.

3. Native Flat-Field Design

The FF110 APO features a native flat-field optical design, eliminating the need for an additional field flattener.
No complex back focus calculations or spacing adjustments are required—simply attach your imaging setup and start capturing once focus is achieved.

Convenient Design

4. Coarse & fine focus adjustment

Equipped with a rigid 3-inch rack-and-pinion focuser, the FF110 APO offers precise control with a 1:10 coarse & fine focus adjustment mechanism.
A built-in 360° rotator at the rear allows for smooth and accurate camera angle adjustments.

5. Retractable Dew Shield

The FF110 APO features a retractable dew shield, reducing overall length for improved portability.
Precision CNC machining and a high-quality painted finish, combined with an internal anti-reflection coating, help minimize stray light and enhance image contrast.

6. Quick-Release Mounting Rings

The mounting rings are detachable, allowing for quick and easy setup or teardown of the telescope.

7. Photography Extension Tube

The FF110 APO includes a photography extension tube with a 2-inch filter thread, along with rear adapters in M48×0.75 and M54×0.75 standards.
This allows for easy integration with a wide range of imaging accessories.

Performance

Optical Layout

Star Field Map

Product Diagram

Specifications

Product Name	FF110 APO
Effective Aperture	110mm
Focal Length	766mm
Focal Ratio	f/7.0
Objective Type	Four-element air-spaced APO(including one ED element)
Image Circle	44mm
Maximum Rear Connection Length (Focuser Retracted)
Imaging Mode	73 mm (measured from the M48×0.75 male thread) 91 mm (measured from the M54×0.75 male thread)
Observation Mode	132 mm (measured from the 1.25″ eyepiece holder) 142 mm (measured from the 2″ eyepiece holder)
Minimum Rear Connection Length (Focuser Retracted)
Imaging Mode	42 mm (measured from M48×0.75 male thread) 60 mm (measured from M54×0.75 male thread)
Observation Mode	101 mm (measured from 1.25″ eyepiece holder) 111 mm (measured from 2″ eyepiece holder)
Overall Length	664 mm (with 1.25″ interface retracted) 728 mm (with photography extension tube retracted) 751 mm (with 1.25″ interface dew shield extended) 815 mm (with photography extension tube dew shield extended)
Telescope Body Weight	5.74 kg
Standard Configuration Weight	6.76 kg (including handle, mounting rings, and dovetail plate)
Rear Interfaces	M78 x 1- 55mm Extension Adapter M78 x 1 – M54 x 0.75 M54 x 0.75 – M54 x 0.75 M54×0.75 – M48×0.75 ( built-in M48×0.75 filter thread )

What’s in the box?

FF Series Telescope Comparison