telescopecomparison · 2-way
Tele Vue NP127fli vs William Optics FLT 120
Tele Vue
NP127fli
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
William Optics
FLT 120
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
-15% focal length
+6% aperture
Faster by 1.3 f-stops
Specifications
| Specification | Tele Vue NP127fli | William Optics FLT 120 |
|---|---|---|
| Optics | ||
| Type | refractor | Refractor |
| Optical design | Nagler-Petzval | Triplet APO |
| Aperture | 127mm | 120mm |
| Focal length | 660mm | 780mm |
| Native f/ratio | f/5.2 | f/6.5 |
| Image circle | 52mm | 44mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 9.5kg | 7.7kg |
Advantages of Tele Vue NP127fli
- Wider field — 660mm vs 780mm focal length
- Faster optics at f/5.2 vs f/6.5
- Larger image circle (52mm) — supports bigger sensors
Advantages of William Optics FLT 120
- Tighter framing — 780mm vs 660mm focal length
- Lighter (7.7kg vs 9.5kg) — easier to travel with
Best for — Tele Vue NP127fli
- Large emission nebulae and star clusters
- Full-frame astro cameras and DSLRs
Best for — William Optics FLT 120
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Tele Vue NP127fli — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 3.13° × 2.08°Scale: 1.18"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.04° × 1.36°Scale: 1.18"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.98° × 0.98°Scale: 1.18"/px
William Optics FLT 120 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.64° × 1.76°Scale: 0.99"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.73° × 1.15°Scale: 0.99"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.83° × 0.83°Scale: 0.99"/px
Tele Vue NP127fli — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
William Optics FLT 120 — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.