telescopecomparison · 2-way
Askar FRA500 vs Askar 65PHQ
Key differences
+20% focal length
+38% aperture
Faster by 0.8 f-stops
Specifications
| Specification | Askar FRA500 | Askar 65PHQ |
|---|---|---|
| Optics | ||
| Type | Refractor | Refractor |
| Optical design | Petzval Quintuplet APO | Quintuplet Petzval |
| Aperture | 90mm | 65mm |
| Focal length | 500mm | 416mm |
| Native f/ratio | f/5.6 | f/6.4 |
| Image circle | 60mm | 44mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 5.4kg | 3.6kg |
Advantages of Askar FRA500
- Tighter framing — 500mm vs 416mm focal length
- 38% more light-gathering aperture
- Faster optics at f/5.6 vs f/6.4
- Larger image circle (60mm) — supports bigger sensors
Advantages of Askar 65PHQ
- Wider field — 416mm vs 500mm focal length
- Lighter (3.6kg vs 5.4kg) — easier to travel with
Best for — Askar FRA500
- Large emission nebulae and star clusters
- Full-frame astro cameras and DSLRs
Best for — Askar 65PHQ
- Large emission nebulae and star clusters
- Full-frame astro cameras and DSLRs
Askar FRA500 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 4.13° × 2.75°Scale: 1.55"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.69° × 1.80°Scale: 1.55"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.29° × 1.29°Scale: 1.55"/px
Askar 65PHQ — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 4.96° × 3.31°Scale: 1.86"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 3.24° × 2.16°Scale: 1.86"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.56° × 1.56°Scale: 1.86"/px
Askar FRA500 — recommended user
Best suited for beginners and wide-field enthusiasts running a backyard imaging setup.
Askar 65PHQ — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.