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The ZWO FF110 APO is a 110mm f/7 quadruplet apochromatic refractor with a built-in field flattener and a full-frame 44mm image circle. At 766mm focal length it brings smaller galaxies and planetary nebulae within reach, while staying light enough (5.74kg / 12.7lb) for a portable harmonic mount.
Why choose the ZWO FF110 APO
- No field flattener needed: the four-element, air-spaced optical design delivers a flat field with sharp stars to the corners, straight out of the box.
- Forgiving back focus: no precise spacing calculations. If you can reach focus, your stars will be sharp.
- Full-frame coverage: a 44mm image circle supports full-frame, APS-C and dedicated astronomy cameras.
- Excellent color correction: one ED (extra-low dispersion) element keeps stars tight and free of color fringing.
- Built for imaging: 3" dual-speed rack-and-pinion focuser with 1:10 fine focus, a 360° camera rotator, and a photography extension tube with M48 and M54 adapters included.
- Easy to mount accessories: the handle doubles as a guide scope mount, with extra finder bases on both sides of the focuser (a great spot for an ASIAIR).
- Travel friendly: retractable dew shield, quick-release tube rings and a CNC-machined tube with anti-reflection coating inside.
Astrophotography and visual observing with the FF110 APO
- Deep-sky imaging of galaxies, planetary nebulae and smaller targets at 766mm
- Full-frame, APS-C and ZWO ASI cameras, with a wide 42-73mm back focus window
- High-resolution visual observing of the Moon, planets and double stars
- Observatory or portable setups on the ZWO AM5N or AM7
ZWO FF110 APO specifications
| Aperture | 110mm |
| Focal length | 766mm |
| Focal ratio | f/7.0 |
| Optical design | Four-element air-spaced APO (one ED element), built-in field flattener |
| Image circle | 44mm (full-frame) |
| Back focus | Focus is achieved anywhere from 42mm to 73mm from the M48x0.75 thread (60mm to 91mm from the M54x0.75 thread) |
| Focuser | 3" dual-speed rack-and-pinion, 1:10 fine focus, 360° rotator |
| Rear adapters | M78x1 55mm extension adapter, M78x1-M54x0.75, M54x0.75-M54x0.75, M54x0.75-M48x0.75 (built-in M48 filter thread) |
| Dovetail | 300mm Vixen-style dovetail plate |
| Overall length | 664mm (1.25" interface retracted) to 815mm (extension tube and dew shield extended) |
| Optical tube weight | 5.74kg (12.7lb) |
| Standard configuration weight | 6.76kg (14.9lb) with handle, tube rings and dovetail |
What's in the box
- FF110 APO optical tube with handle, tube rings and dovetail plate
- Photography extension tube with M48 and M54 adapters
- User manual, inspection sheet and warranty card
Diagonal, eyepieces, camera and mount are sold separately.
Compare the ZWO FF APO refractors
| Model | Aperture | Focal length | Weight (OTA) |
| FF70 APO | 70mm | 490mm (f/7.0) | 2.5kg |
| FF90 APO | 90mm | 609mm (f/6.8) | 3.92kg |
| FF110 APO (this scope) | 110mm | 766mm (f/7.0) | 5.74kg |
| FF131 APO | 131mm | 983mm (f/7.5) | 7.9kg |
ZWO FF110 APO FAQ
Do I need a field flattener with the FF110 APO?
No. The FF110 APO has a built-in flattener, so stars stay sharp to the edges of a full-frame sensor without any extra optics. There's also no exact back focus distance to hit. Anywhere from 42mm to 73mm of spacing behind the M48 thread will reach focus, which covers most camera and filter setups.
Can I use the FF110 APO for visual observing?
Yes. The focuser accepts 1.25" and 2" accessories, so you can add a star diagonal and eyepieces for visual use. These are sold separately.
What mount do I need for the FF110 APO?
With a standard configuration weight of 6.76kg (14.9lb), the FF110 APO is a great match for the ZWO AM5N or AM7 once you add your camera and accessories. For a matched setup, see the ZWO 110APO + AM5N bundle or the ZWO 110APO + AM7 bundle.
Which cameras work with the FF110 APO?
Dedicated astronomy cameras like ZWO ASI models, plus DSLR and mirrorless cameras using the appropriate T-ring. The 44mm image circle covers full-frame sensors, and the included M48 and M54 adapters fit most modern imaging trains.
Not sure which ZWO refractor is right for you? Contact us and our team will help you choose.