The compact Fluorostar: triplet quality in travel size
The William Optics Fluorostar 91 Space Gray brings the Fluorostar triplet line to a compact, portable size. The triplet of FPL-53 and lanthanum glass shows stars as true points with pure colors: double stars clearly separated and fine details on Jupiter and Saturn.
Lots of light, large field of view
The 91mm aperture at a 540mm focal length (f/5.9) combines light-gathering power with a generous field of view, suitable for both bright deep-sky images and high-contrast planetary observations. The 1:10 rack-and-pinion focuser achieves micron-level sharpness and can support a full camera rig. The retractable dew shield helps keep the lens clear for longer, and the deluxe carrying case offers protection during transport.
In the box
- Optical tube Fluorostar 91/540 triplet, Space Gray
- Retractable lens hood
- 1:10 rack-and-pinion focuser
- Losmandy dovetail
- Handle
- Bahtinov mask
- Luxury transport bag
Featured accessories
The William Optics FLT91 Flat6A III Special Edition (429 euros) is the exact matching flattener-reducer for this tube; the UniGuide 32 mm guidescope (159 euros) enables guided imaging.
For whom yes, for whom no
For: astrophotographers who want Fluorostar triplet quality in a travel-friendly, light-mount-compatible package. Not for: those seeking maximum aperture for a fixed setup; the Fluorostar 120 or 132 will provide more light and resolution.
Specifications
| Optical design | Apochromat, FPL-53 triplet with lanthanum glass |
| Opening | 91 millimeters |
| Focal length | 540 mm |
| Opening ratio | f/5,9 |
| Focuser | Rack and pinion with 1:10 fine adjustment |
| Dew cap | Retractable |
| Attachment | Losmandy dovetail with handle |
| Execution | OTA (loose tube), Space Gray |
Unsure about the right tube for your camera and mount? The telescope selection aid helps you choose. Also view all Refracting telescopes and the full range of William Optics.
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