telescopecomparison · 2-way
ZWO FF90 APO vs Tele Vue TV-85
ZWO
FF90 APO
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
Tele Vue
TV-85
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
Key differences
+6% aperture
Specifications
| Specification | ZWO FF90 APO | Tele Vue TV-85 |
|---|---|---|
| Optics | ||
| Type | refractor | refractor |
| Optical design | Apo quadruplet ED | Apo doublet |
| Aperture | 90mm | 85mm |
| Focal length | 609mm | 600mm |
| Native f/ratio | f/6.8 | f/7.0 |
| Image circle | 44mm | — |
| Full-frame support | Yes | No |
| Physical | ||
| Weight | 3.9kg | 2.9kg |
Advantages of ZWO FF90 APO
- Larger image circle (44mm) — supports bigger sensors
Advantages of Tele Vue TV-85
- Lighter (2.9kg vs 3.92kg) — easier to travel with
Best for — ZWO FF90 APO
- Large emission nebulae and star clusters
- Full-frame astro cameras and DSLRs
Best for — Tele Vue TV-85
- Large emission nebulae and star clusters
ZWO FF90 APO — typical FOV & 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
Tele Vue TV-85 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 3.44° × 2.29°Scale: 1.29"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.24° × 1.50°Scale: 1.29"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.08° × 1.08°Scale: 1.29"/px
ZWO FF90 APO — recommended user
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
Tele Vue TV-85 — recommended user
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
