telescopecomparison · 2-way
Askar 151PHQ vs Takahashi TSA-120
Askar
151PHQ
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.
Takahashi
TSA-120
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
+17% focal length
+26% aperture
Faster by 0.5 f-stops
Specifications
| Specification | Askar 151PHQ | Takahashi TSA-120 |
|---|---|---|
| Optics | ||
| Type | refractor | Refractor |
| Optical design | Petzval quintuplet FPL-51 | Triplet APO |
| Aperture | 151mm | 120mm |
| Focal length | 1057mm | 900mm |
| Native f/ratio | f/7.0 | f/7.5 |
| Image circle | 60mm | 44mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 15.5kg | 7.5kg |
Advantages of Askar 151PHQ
- Tighter framing — 1057mm vs 900mm focal length
- 26% more light-gathering aperture
- Faster optics at f/7 vs f/7.5
- Larger image circle (60mm) — supports bigger sensors
Advantages of Takahashi TSA-120
- Wider field — 900mm vs 1057mm focal length
- Lighter (7.5kg vs 15.5kg) — easier to travel with
Best for — Askar 151PHQ
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Best for — Takahashi TSA-120
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
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
Takahashi TSA-120 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.29° × 1.53°Scale: 0.86"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.50° × 1.00°Scale: 0.86"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.72° × 0.72°Scale: 0.86"/px
Askar 151PHQ — recommended user
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.
Takahashi TSA-120 — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.