telescopecomparison · 2-way
ZWO FF80 APO vs Askar SQA85
ZWO
FF80 APO
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
Key differences
+12% focal length
-6% aperture
Slower by 1.2 f-stops
Specifications
| Specification | ZWO FF80 APO | Askar SQA85 |
|---|---|---|
| Optics | ||
| Type | refractor | refractor |
| Optical design | Apo doublet FCD-100 | Quadruplet astrograph FPL-51 |
| Aperture | 80mm | 85mm |
| Focal length | 560mm | 500mm |
| Native f/ratio | f/7.0 | f/5.8 |
| Image circle | 44mm | 52mm |
| Full-frame support | No | Yes |
| Physical | ||
| Weight | 4.0kg | 4.4kg |
Advantages of ZWO FF80 APO
- Tighter framing — 560mm vs 500mm focal length
Advantages of Askar SQA85
- Wider field — 500mm vs 560mm focal length
- Faster optics at f/5.8 vs f/7
- Larger image circle (52mm) — supports bigger sensors
Best for — ZWO FF80 APO
- Large emission nebulae and star clusters
Best for — Askar SQA85
- Large emission nebulae and star clusters
- Full-frame astro cameras and DSLRs
ZWO FF80 APO — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 3.68° × 2.46°Scale: 1.38"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.40° × 1.61°Scale: 1.38"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.16° × 1.16°Scale: 1.38"/px
Askar SQA85 — 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
ZWO FF80 APO — recommended user
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
Askar SQA85 — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.