OTA · MSRP $1,998
William Optics Fluorostar 91
Key specifications
| Aperture | 91 mm |
|---|---|
| Focal length | 540 mm |
| Focal ratio | f/5.9 |
| Optical design | Triplet APO |
| Weight | 4.16 kg |
All specifications
| Focuser type | 3.3 inch rack-and-pinion, EAF compatible, 95 mm travel |
|---|---|
| Tube length | 441 mm |
| Dovetail | Vixen |
About
A 91 mm f/5.9 triplet APO refractor covering a 43 mm image circle, on a 3.3-inch rack-and-pinion focuser with 95 mm of travel, an M92 rotator and extender and a 2-inch RotoLock. Rides on a Vixen dovetail and takes the Ultra Flat 91 or, with adapters, the FLAT 68III and FLAT 6AIII.