telescopecomparison · 2-way
TS-Optics UNC 254 f/4 Newtonian Astrograph vs William Optics FLT 156
TS-Optics
UNC 254 f/4 Newtonian Astrograph
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
-6% focal length
+63% aperture
Faster by 3.0 f-stops
Specifications
| Specification | TS-Optics UNC 254 f/4 Newtonian Astrograph | William Optics FLT 156 |
|---|---|---|
| Optics | ||
| Type | newtonian | refractor |
| Optical design | Newtonian astrograph | Apo triplet FPL-53 |
| Aperture | 254mm | 156mm |
| Focal length | 1016mm | 1085mm |
| Native f/ratio | f/4.0 | f/7.0 |
| Image circle | — | 52mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 14.0kg | 11.5kg |
Advantages of TS-Optics UNC 254 f/4 Newtonian Astrograph
- 63% more light-gathering aperture
- Faster optics at f/4 vs f/7
Advantages of William Optics FLT 156
- Larger image circle (52mm) — supports bigger sensors
- Lighter (11.5kg vs 14kg) — easier to travel with
Best for — TS-Optics UNC 254 f/4 Newtonian Astrograph
- Medium-sized galaxies and planetary nebulae
- Fast imaging — short exposures per sub
- Faint-object imaging under dark skies
- Full-frame astro cameras and DSLRs
Best for — William Optics FLT 156
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
TS-Optics UNC 254 f/4 Newtonian Astrograph — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.03° × 1.35°Scale: 0.76"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.33° × 0.89°Scale: 0.76"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.64° × 0.64°Scale: 0.76"/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
TS-Optics UNC 254 f/4 Newtonian Astrograph — 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.
