telescope
ZWO
FF90 APO
90mm Apo quadruplet ED · 609mm f/6.8
Flat-field quadruplet; 44mm documented image circle.
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Product specifications can change. Please verify specifications and compatibility with the manufacturer or retailer before purchasing.
Best for
- Large emission nebulae and star clusters
- Full-frame astro cameras and DSLRs
Specifications
| Optics | |
| Type | refractor |
| Optical design | Apo quadruplet ED |
| Aperture | 90mm |
| Focal length | 609mm |
| Native f/ratio | f/6.8 |
| Image circle | 44mm |
| Full-frame support | Yes |
| Physical | |
| Weight | 3.9kg |
Typical FOV & image scale
With Full-frame (36×24mm, 3.76µm)
FOV 3.39° × 2.26°
Scale 1.27″/px
With APS-C (23.5×15.7mm, 3.76µm)
FOV 2.21° × 1.48°
Scale 1.27″/px
With IMX533 square (11.3×11.3mm, 3.76µm)
FOV 1.06° × 1.06°
Scale 1.27″/px
Typical targets
- M17 — Omega NebulaEmission Nebula · 46′Plan this target
- NGC 1893 — Emission Nebula NGC 1893Emission Nebula · 45′Plan this target
- NGC 6357 — Lobster NebulaEmission Nebula · 50′Plan this target
- IC 443 — Jellyfish NebulaSupernova Remnant · 50′Plan this target
- Sh2-155 — Cave NebulaEmission Nebula · 50′Plan this target
- NGC 2070 — Tarantula NebulaEmission Nebula · 40′Plan this target
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Source: www.zwoastro.com