OTA · MSRP $999
ZWO FF90 APO
Key specifications
| Aperture | 90 mm |
|---|---|
| Focal length | 609 mm |
| Focal ratio | f/6.8 |
| Optical design | Quadruplet APO |
| Back focus | 45 mm |
| Weight | 3.92 kg |
All specifications
| Focuser type | 3-inch rack-and-pinion, 1:10 coarse & fine adjustment, 360° rotator |
|---|---|
| Dovetail | Vixen |
About
90mm four-element fully air-spaced apochromatic flat-field refractor with native flat-field design (no additional flattener required), 44mm image circle supporting full-frame sensors, 3-inch rack-and-pinion focuser with 1:10 coarse & fine adjustment, built-in 360° rotator, and retractable dew shield.