William Optics Fluorostar 156 Gray OTA — 156 mm triplet apochromatic refractor The Fluorostar 156 has a 1217 mm focal length at f/7.8. The current William Optics product specification lists a 43 mm image circle.
Manufacturer model: William Optics Fluorostar 156 Gray OTA · Specifications checked against manufacturer data on 2026-11-03
The Fluorostar 156 has a 1217 mm focal length at f/7.8. The current William Optics product specification lists a 43 mm image circle.
The triplet objective can be paired with the manufacturer's listed optional field flatteners or reducers.
3.7-inch rack-and-pinion focusing provides 99 mm travel. Connections: M92 rotator; M92 to 2-inch RotoLock. Each corrector has its own backfocus and adjustment setting; these are listed separately in the specifications.
Tube length is 1120–1330 mm; OTA weight is 17 kg.
William Optics manufacturer manual
Prime-lens telescope: corrector compatibility and spacing are model-specific. Optional correctors are listed, not assumed included; corrector adapters may be required.
| Flat7a spacing | 65.3 mm backfocus; 10.29 mm adjustment |
|---|---|
| Flat8 spacing | 60.8 mm backfocus; 5.8 mm adjustment |
| Ultra flat156 spacing | 55 mm backfocus; fixed |
Data sheet
William Optics Fluorostar 156 Gray OTA — 156 mm triplet apochromatic refractor The Fluorostar 156 has a 1217 mm focal length at f/7.8. The current William Optics product specification lists a 43 mm image circle.
Manufacturer model: William Optics Fluorostar 156 Gray OTA · Specifications checked against manufacturer data on 2026-11-03
