telescopecomparison · 2-way
Astro-Physics 155mm f/6 StarFire CS vs Askar 151PHQ
Astro-Physics
155mm f/6 StarFire CS
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Askar
151PHQ
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.
Key differences
-12% focal length
Faster by 1.0 f-stops
Specifications
| Specification | Astro-Physics 155mm f/6 StarFire CS | Askar 151PHQ |
|---|---|---|
| Optics | ||
| Type | refractor | refractor |
| Optical design | Christen Superachromat (4-element) | Petzval quintuplet FPL-51 |
| Aperture | 155mm | 151mm |
| Focal length | 930mm | 1057mm |
| Native f/ratio | f/6.0 | f/7.0 |
| Image circle | 64mm | 60mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 10.9kg | 15.5kg |
Advantages of Astro-Physics 155mm f/6 StarFire CS
- Wider field — 930mm vs 1057mm focal length
- Faster optics at f/6 vs f/7
- Lighter (10.9kg vs 15.5kg) — easier to travel with
Advantages of Askar 151PHQ
- Tighter framing — 1057mm vs 930mm focal length
Best for — Astro-Physics 155mm f/6 StarFire CS
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Best for — Askar 151PHQ
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Astro-Physics 155mm f/6 StarFire CS — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.22° × 1.48°Scale: 0.83"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.45° × 0.97°Scale: 0.83"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.70° × 0.70°Scale: 0.83"/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
Astro-Physics 155mm f/6 StarFire CS — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Askar 151PHQ — recommended user
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.
