telescopecomparison · 2-way
Tele Vue NP101is vs Tele Vue TV-85
Tele Vue
NP101is
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
-10% focal length
+19% aperture
Faster by 1.6 f-stops
Specifications
| Specification | Tele Vue NP101is | Tele Vue TV-85 |
|---|---|---|
| Optics | ||
| Type | Refractor | refractor |
| Optical design | Petzval | Apo doublet |
| Aperture | 101mm | 85mm |
| Focal length | 540mm | 600mm |
| Native f/ratio | f/5.4 | f/7.0 |
| Image circle | 40mm | — |
| Full-frame support | Yes | No |
| Physical | ||
| Weight | 4.5kg | 2.9kg |
Advantages of Tele Vue NP101is
- 19% more light-gathering aperture
- Faster optics at f/5.4 vs f/7
- Larger image circle (40mm) — supports bigger sensors
Advantages of Tele Vue TV-85
- Tighter framing — 600mm vs 540mm focal length
- Lighter (2.9kg vs 4.5kg) — easier to travel with
Best for — Tele Vue NP101is
- Large emission nebulae and star clusters
- Full-frame astro cameras and DSLRs
Best for — Tele Vue TV-85
- Large emission nebulae and star clusters
Tele Vue NP101is — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 3.82° × 2.55°Scale: 1.44"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.49° × 1.67°Scale: 1.44"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.20° × 1.20°Scale: 1.44"/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
Tele Vue NP101is — 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.