telescope
William Optics
Pleiades 181
181mm Astrograph (7-element) · 998mm f/5.5
Large-aperture astrograph; medium format capable.
Check Current Price
Affiliate link. AstroPhotoGuru may earn a commission at no additional cost to you. Link for William Optics Pleiades 181.
Product specifications can change. Please verify specifications and compatibility with the manufacturer or retailer before purchasing.
Best for
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Specifications
| Optics | |
| Type | astrograph |
| Optical design | Astrograph (7-element) |
| Aperture | 181mm |
| Focal length | 998mm |
| Native f/ratio | f/5.5 |
| Image circle | 55mm |
| Full-frame support | Yes |
| Physical | |
| Weight | 15.0kg |
Typical FOV & image scale
With Full-frame (36×24mm, 3.76µm)
FOV 2.07° × 1.38°
Scale 0.78″/px
With APS-C (23.5×15.7mm, 3.76µm)
FOV 1.35° × 0.90°
Scale 0.78″/px
With IMX533 square (11.3×11.3mm, 3.76µm)
FOV 0.65° × 0.65°
Scale 0.78″/px
Typical targets
- M20 — Trifid NebulaEmission Nebula · 28′Plan this target
- M35 — Open Cluster M35Open Cluster · 28′Plan this target
- M101 — Pinwheel GalaxyGalaxy · 28.8′Plan this target
- NGC 2175 — Emission Nebula NGC 2175Emission Nebula · 29′Plan this target
- NGC 5457 — Pinwheel Galaxy NGC 5457Galaxy · 29′Plan this target
- M23 — Open Cluster M23Open Cluster · 27′Plan this target
Recommended cameras
Compare with similar
Source: williamoptics.com