telescopecomparison · 2-way
Celestron C6 SCT vs Askar 151PHQ
Askar
151PHQ
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.
Key differences
+42% focal length
Slower by 3.0 f-stops
Specifications
| Specification | Celestron C6 SCT | Askar 151PHQ |
|---|---|---|
| Optics | ||
| Type | sct | refractor |
| Optical design | Schmidt-Cassegrain | Petzval quintuplet FPL-51 |
| Aperture | 150mm | 151mm |
| Focal length | 1500mm | 1057mm |
| Native f/ratio | f/10.0 | f/7.0 |
| Image circle | — | 60mm |
| Full-frame support | No | Yes |
| Physical | ||
| Weight | 4.5kg | 15.5kg |
Advantages of Celestron C6 SCT
- Tighter framing — 1500mm vs 1057mm focal length
- Lighter (4.5kg vs 15.5kg) — easier to travel with
Advantages of Askar 151PHQ
- Wider field — 1057mm vs 1500mm focal length
- Faster optics at f/7 vs f/10
- Larger image circle (60mm) — supports bigger sensors
Best for — Celestron C6 SCT
- Small galaxies, planetary nebulae, lunar & planetary detail
- High-resolution long-exposure work
Best for — Askar 151PHQ
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Celestron C6 SCT — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 1.38° × 0.92°Scale: 0.52"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 0.90° × 0.60°Scale: 0.52"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.43° × 0.43°Scale: 0.52"/px
Askar 151PHQ — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 1.95° × 1.30°Scale: 0.73"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.27° × 0.85°Scale: 0.73"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.61° × 0.61°Scale: 0.73"/px
Celestron C6 SCT — recommended user
Best suited for experienced imagers chasing detail running a portable travel rig.
Askar 151PHQ — recommended user
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.