telescopecomparison · 2-way
ZWO FF80 APO vs ZWO FF90 APO
ZWO
FF80 APO
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
ZWO
FF90 APO
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
Key differences
-8% focal length
-11% aperture
Specifications
| Specification | ZWO FF80 APO | ZWO FF90 APO |
|---|---|---|
| Optics | ||
| Type | refractor | refractor |
| Optical design | Apo doublet FCD-100 | Apo quadruplet ED |
| Aperture | 80mm | 90mm |
| Focal length | 560mm | 609mm |
| Native f/ratio | f/7.0 | f/6.8 |
| Image circle | 44mm | 44mm |
| Full-frame support | No | Yes |
| Physical | ||
| Weight | 4.0kg | 3.9kg |
Advantages of ZWO FF80 APO
Closely matched on the compared specs.
Advantages of ZWO FF90 APO
- 13% more light-gathering aperture
Best for — ZWO FF80 APO
- Large emission nebulae and star clusters
Best for — ZWO FF90 APO
- 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
ZWO FF90 APO — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 3.39° × 2.26°Scale: 1.27"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.21° × 1.48°Scale: 1.27"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.06° × 1.06°Scale: 1.27"/px
ZWO FF80 APO — recommended user
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
ZWO FF90 APO — recommended user
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
