telescopecomparison · 2-way
Astro-Physics 190mm f/6 StarFire CS vs William Optics FLT 156
Astro-Physics
190mm f/6 StarFire CS
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.
William Optics
FLT 156
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
+5% focal length
+22% aperture
Faster by 1.0 f-stops
Specifications
| Specification | Astro-Physics 190mm f/6 StarFire CS | William Optics FLT 156 |
|---|---|---|
| Optics | ||
| Type | refractor | refractor |
| Optical design | Christen Superachromat (4-element) | Apo triplet FPL-53 |
| Aperture | 190mm | 156mm |
| Focal length | 1140mm | 1085mm |
| Native f/ratio | f/6.0 | f/7.0 |
| Image circle | 64mm | 52mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 17.7kg | 11.5kg |
Advantages of Astro-Physics 190mm f/6 StarFire CS
- 22% more light-gathering aperture
- Faster optics at f/6 vs f/7
- Larger image circle (64mm) — supports bigger sensors
Advantages of William Optics FLT 156
- Lighter (11.5kg vs 17.7kg) — easier to travel with
Best for — Astro-Physics 190mm f/6 StarFire CS
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Best for — William Optics FLT 156
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Astro-Physics 190mm f/6 StarFire CS — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 1.81° × 1.21°Scale: 0.68"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.18° × 0.79°Scale: 0.68"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.57° × 0.57°Scale: 0.68"/px
William Optics FLT 156 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 1.90° × 1.27°Scale: 0.71"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.24° × 0.83°Scale: 0.71"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.60° × 0.60°Scale: 0.71"/px
Astro-Physics 190mm f/6 StarFire CS — recommended user
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.
William Optics FLT 156 — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
