telescopecomparison · 2-way
Askar FRA400 vs Askar 151PHQ
Askar
151PHQ
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.
Key differences
-62% focal length
-52% aperture
Faster by 1.4 f-stops
Specifications
| Specification | Askar FRA400 | Askar 151PHQ |
|---|---|---|
| Optics | ||
| Type | Refractor | refractor |
| Optical design | Petzval Quintuplet APO | Petzval quintuplet FPL-51 |
| Aperture | 72mm | 151mm |
| Focal length | 400mm | 1057mm |
| Native f/ratio | f/5.6 | f/7.0 |
| Image circle | 44mm | 60mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 3.9kg | 15.5kg |
Advantages of Askar FRA400
- Wider field — 400mm vs 1057mm focal length
- Faster optics at f/5.6 vs f/7
- Lighter (3.9kg vs 15.5kg) — easier to travel with
Advantages of Askar 151PHQ
- Tighter framing — 1057mm vs 400mm focal length
- 110% more light-gathering aperture
- Larger image circle (60mm) — supports bigger sensors
Best for — Askar FRA400
- Large emission nebulae and star clusters
- Full-frame astro cameras and DSLRs
Best for — Askar 151PHQ
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Askar FRA400 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 5.16° × 3.44°Scale: 1.94"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 3.37° × 2.25°Scale: 1.94"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.62° × 1.62°Scale: 1.94"/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
Askar FRA400 — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
Askar 151PHQ — recommended user
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.