telescope
William Optics
FLT 120
120mm Triplet APO · 780mm f/6.5
FPL-53 triplet; use with dedicated flattener for FF.
Best for
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Specifications
| Optics | |
| Type | Refractor |
| Optical design | Triplet APO |
| Aperture | 120mm |
| Focal length | 780mm |
| Native f/ratio | f/6.5 |
| Image circle | 44mm |
| Full-frame support | Yes |
| Physical | |
| Weight | 7.7kg |
Typical FOV & image scale
With Full-frame (36×24mm, 3.76µm)
FOV 2.64° × 1.76°
Scale 0.99″/px
With APS-C (23.5×15.7mm, 3.76µm)
FOV 1.73° × 1.15°
Scale 0.99″/px
With IMX533 square (11.3×11.3mm, 3.76µm)
FOV 0.83° × 0.83°
Scale 0.99″/px
Recommended accessories
- William Optics Adjustable Flat 6AIII 0.8xreducer · 0.8× focal lengthmanufacturer supported
Typical targets
- NGC NGC 5139 — Omega CentauriGlobular Cluster · 36′
- IC IC 405 — Flaming Star NebulaEmission Nebula · 37′
- Messier M16 — Eagle NebulaEmission Nebula · 35′
- NGC NGC 281 — Pacman NebulaEmission Nebula · 35′
- Messier M34 — Open Cluster M34Open Cluster · 35′
- Messier M41 — Open Cluster M41Open Cluster · 38′
Recommended cameras
28.4mm sensor · 4.78µm px · cooled
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Compare pairing28.3mm sensor · 3.76µm px · cooled
Compare pairing