telescopecomparison · 2-way
Borg 55FL vs Vaonis Vespera II
Key differences
+10% aperture
Faster by 0.5 f-stops
Specifications
| Specification | Borg 55FL | Vaonis Vespera II |
|---|---|---|
| Optics | ||
| Type | refractor | smart-telescope |
| Optical design | Apo doublet fluorite | Apo quadruplet all-in-one |
| Aperture | 55mm | 50mm |
| Focal length | 250mm | 250mm |
| Native f/ratio | f/4.5 | f/5.0 |
| Image circle | — | — |
| Full-frame support | No | No |
| Physical | ||
| Weight | 1.2kg | 5.0kg |
Advantages of Borg 55FL
- Faster optics at f/4.5 vs f/5
- Lighter (1.2kg vs 5kg) — easier to travel with
Advantages of Vaonis Vespera II
Closely matched on the compared specs.
Best for — Borg 55FL
- Wide-field nebulae and Milky Way regions
- Fast imaging — short exposures per sub
Best for — Vaonis Vespera II
- Wide-field nebulae and Milky Way regions
- Fast imaging — short exposures per sub
Borg 55FL — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 8.25° × 5.50°Scale: 3.10"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 5.39° × 3.60°Scale: 3.10"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 2.59° × 2.59°Scale: 3.10"/px
Vaonis Vespera II — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 8.25° × 5.50°Scale: 3.10"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 5.39° × 3.60°Scale: 3.10"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 2.59° × 2.59°Scale: 3.10"/px
Borg 55FL — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
Vaonis Vespera II — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.