telescopecomparison · 2-way
Askar 71F vs Tele Vue TV-76
Key differences
-7% aperture
Slower by 0.6 f-stops
Specifications
| Specification | Askar 71F | Tele Vue TV-76 |
|---|---|---|
| Optics | ||
| Type | refractor | refractor |
| Optical design | Petzval quintuplet FPL-51 | Apo doublet |
| Aperture | 71mm | 76mm |
| Focal length | 490mm | 480mm |
| Native f/ratio | f/6.9 | f/6.3 |
| Image circle | 44mm | — |
| Full-frame support | Yes | No |
| Physical | ||
| Weight | 3.2kg | 2.3kg |
Advantages of Askar 71F
- Larger image circle (44mm) — supports bigger sensors
Advantages of Tele Vue TV-76
- Faster optics at f/6.3 vs f/6.9
- Lighter (2.3kg vs 3.2kg) — easier to travel with
Best for — Askar 71F
- Large emission nebulae and star clusters
- Full-frame astro cameras and DSLRs
Best for — Tele Vue TV-76
- Large emission nebulae and star clusters
Askar 71F — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 4.21° × 2.81°Scale: 1.58"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.75° × 1.84°Scale: 1.58"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.32° × 1.32°Scale: 1.58"/px
Tele Vue TV-76 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 4.30° × 2.86°Scale: 1.62"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.81° × 1.87°Scale: 1.62"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.35° × 1.35°Scale: 1.62"/px
Askar 71F — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
Tele Vue TV-76 — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.