telescopecomparison · 2-way
Sky-Watcher Quattro 200P vs William Optics FLT 91
Sky-Watcher
Quattro 200P
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
William Optics
FLT 91
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
Key differences
+48% focal length
+120% aperture
Faster by 1.9 f-stops
Specifications
| Specification | Sky-Watcher Quattro 200P | William Optics FLT 91 |
|---|---|---|
| Optics | ||
| Type | Newtonian | Refractor |
| Optical design | Imaging Newtonian | Triplet APO |
| Aperture | 200mm | 91mm |
| Focal length | 800mm | 540mm |
| Native f/ratio | f/4.0 | f/5.9 |
| Image circle | 32mm | 44mm |
| Full-frame support | No | Yes |
| Physical | ||
| Weight | 10.5kg | 4.5kg |
Advantages of Sky-Watcher Quattro 200P
- Tighter framing — 800mm vs 540mm focal length
- 120% more light-gathering aperture
- Faster optics at f/4 vs f/5.9
Advantages of William Optics FLT 91
- Wider field — 540mm vs 800mm focal length
- Larger image circle (44mm) — supports bigger sensors
- Lighter (4.5kg vs 10.5kg) — easier to travel with
Best for — Sky-Watcher Quattro 200P
- Medium-sized galaxies and planetary nebulae
- Fast imaging — short exposures per sub
- Faint-object imaging under dark skies
Best for — William Optics FLT 91
- Large emission nebulae and star clusters
- Full-frame astro cameras and DSLRs
Sky-Watcher Quattro 200P — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.58° × 1.72°Scale: 0.97"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.68° × 1.12°Scale: 0.97"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.81° × 0.81°Scale: 0.97"/px
William Optics FLT 91 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 3.82° × 2.55°Scale: 1.44"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.49° × 1.67°Scale: 1.44"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.20° × 1.20°Scale: 1.44"/px
Sky-Watcher Quattro 200P — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
William Optics FLT 91 — recommended user
Best suited for intermediate imagers building a versatile kit running a portable travel rig.