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766mm of reach for galaxies, with a flat field built in
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. Its 766mm focal length brings smaller galaxies and planetary nebulae within reach, the 3" focuser handles heavy cameras and filter wheels, and at 5.74kg (12.7lb) it still rides on a portable harmonic mount.
Key specs: 110mm aperture · 766mm f/7.0 · 44mm full-frame image circle · built-in field flattener · 5.74kg (12.7lb) tube · 3" dual-speed rack-and-pinion focuser
Questions about building a setup around it? Our team is happy to help.
What you can image and see
- Galaxies: the Whirlpool, Pinwheel, Sunflower and Leo Triplet, and the Sombrero at a pleasing scale.
- Planetary nebulae: the Dumbbell, Ring and Owl nebulae.
- Nebula detail: the Pillars of Creation in the Eagle Nebula, the Horsehead and Flame nebulae, and the Elephant's Trunk.
- Visual: detailed views of the Moon, Saturn and Jupiter, and tight double stars.
No flattener, no spacing math
Most refractors need a separate field flattener set at an exact distance from the sensor. The FF110 APO's four-element, air-spaced design (with one ED element) has the flattener built in, so there's no back focus to calculate: anywhere from 42mm to 73mm of spacing behind the M48 thread, you'll reach focus with sharp stars to the corners. The included photography extension tube and M48/M54 adapters connect dedicated astronomy cameras, DSLRs and mirrorless cameras, and the 360° rotator lets you frame your target without touching focus.
What to add for the best results
- A mount (required): the ZWO AM5N is a great match. Or save time with the ZWO 110APO + AM5N bundle or the ZWO 110APO + AM7 bundle.
- A camera: the ZWO ASI2600MC Pro (APS-C, cooled) is a popular pairing; the ZWO ASI533MC Pro is a great-value cooled color camera with a square sensor.
- Guiding: the ZWO 30F5 Mini Guide Scope with an ASI120MM Mini guide camera mounts right on the handle.
- Control and focus: the ASIAIR PLUS runs the whole rig from your phone, and the ZWO EAFN electronic focuser keeps stars sharp as the temperature drops.
- Filters: for city and suburban skies, a ZWO Duo-Band filter in a ZWO M54 2" filter drawer cuts light pollution on nebulae.
- For visual use: a 2" star diagonal like the Celestron 2" Dielectric Star Diagonal plus your eyepieces.
FF110 APO vs. the other ZWO FF refractors
| FF70 APO | FF90 APO | FF110 APO | FF131 APO | |
|---|---|---|---|---|
| Aperture | 70mm | 90mm | 110mm | 131mm |
| Focal length | 490mm (f/7.0) | 609mm (f/6.8) | 766mm (f/7.0) | 983mm (f/7.5) |
| Field of view, APS-C | 2.7° × 1.8° | 2.2° × 1.5° | 1.8° × 1.2° | 1.4° × 0.9° |
| Field of view, full frame | 4.2° × 2.8° | 3.4° × 2.3° | 2.7° × 1.8° | 2.1° × 1.4° |
| Tube weight | 2.5kg (5.5lb) | 3.92kg (8.6lb) | 5.74kg (12.7lb) | 7.9kg (17.4lb) |
| Focuser | 2.4" | 3" | 3" | 3" |
| Best for | Lightest, widest field; best first astrograph | Best balance of reach and portability | Galaxies and detail on a portable mount | Maximum reach for small galaxies |
Still deciding? Browse all our refractor telescopes or the full ZWO telescope lineup.
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
Mount, camera, diagonal and eyepieces are sold separately.
ZWO FF110 APO FAQ
Do I need a field flattener with the FF110 APO?
No. The flattener is built into the optics, so stars stay sharp to the corners of a full-frame sensor, and there's no exact back focus to hit: anywhere from 42mm to 73mm of spacing behind the M48 thread, you'll reach focus.
Which camera works best with the FF110 APO?
An APS-C sensor like the ASI2600MC Pro gives about a 1.8° × 1.2° field at 766mm, a nice scale for galaxies and nebula detail. A smaller sensor like the ASI533MC Pro frames individual galaxies tightly. The 44mm image circle covers full-frame sensors too. DSLR and mirrorless cameras also work with the matching T-ring.
What mount do I need for the FF110 APO?
At 6.76kg (14.9lb) with rings and dovetail, the FF110 APO is a great match for the ZWO AM5N, or the ZWO AM7 if you'll add a heavy cooled camera, filter wheel and guide scope. See the ZWO 110APO + AM5N bundle or the ZWO 110APO + AM7 bundle for a matched setup.
Can I use the FF110 APO for visual observing?
Yes. The focuser accepts 1.25" and 2" accessories, so add a star diagonal and eyepieces. The color-free optics give crisp views of the Moon, planets and star clusters.
FF110 or FF131?
The FF131 gathers about 40% more light and reaches 983mm, but it weighs 7.9kg and needs a sturdier mount. The FF110 is the more portable choice and still reaches most galaxies and planetary nebulae.
Specifications
| Optics | |
|---|---|
| Optical design | Four-element air-spaced apochromat (one ED element), built-in field flattener |
| Aperture | 110mm |
| Focal length | 766mm |
| Focal ratio | f/7.0 |
| Image circle | 44mm (full frame) |
| Mechanical | |
| Focuser | 3" dual-speed rack-and-pinion, 1:10 fine focus, 360° rotator |
| Back focus | Focus anywhere from 42mm to 73mm from the M48x0.75 thread (60mm to 91mm from the M54x0.75 thread) |
| Rear adapters | M78x1 55mm extension, M78x1-M54x0.75, M54x0.75-M54x0.75, M54x0.75-M48x0.75 (built-in M48 filter thread) |
| Dovetail | 300mm Vixen-style dovetail plate |
| Dew shield | Retractable |
| Physical | |
| Overall length | 664mm (1.25" interface retracted) to 815mm (photography extension tube extended) |
| Optical tube weight | 5.74kg (12.7lb) |
| Standard configuration weight | 6.76kg (14.9lb) with handle, tube rings and dovetail |
| ZWO model | FF110-APO |