telescopecomparison · 2-way
ZWO FF65 APO vs Askar FRA400
Key differences
-10% aperture
Slower by 0.8 f-stops
Specifications
| Specification | ZWO FF65 APO | Askar FRA400 |
|---|---|---|
| Optics | ||
| Type | refractor | Refractor |
| Optical design | Quintuplet air-spaced APO (two ED elements) | Petzval Quintuplet APO |
| Aperture | 65mm | 72mm |
| Focal length | 416mm | 400mm |
| Native f/ratio | f/6.4 | f/5.6 |
| Image circle | 44mm | 44mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 2.0kg | 3.9kg |
Advantages of ZWO FF65 APO
- Lighter (2kg vs 3.9kg) — easier to travel with
Advantages of Askar FRA400
- 11% more light-gathering aperture
- Faster optics at f/5.6 vs f/6.4
Best for — ZWO FF65 APO
- Large emission nebulae and star clusters
- Full-frame astro cameras and DSLRs
Best for — Askar FRA400
- Large emission nebulae and star clusters
- Full-frame astro cameras and DSLRs
ZWO FF65 APO — 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 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
ZWO FF65 APO — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
Askar FRA400 — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
