telescopecomparison · 2-way
TS-Optics PHOTOLINE 80 f/6 Triplet APO vs TS-Optics UNC 254 f/4 Newtonian Astrograph
TS-Optics
PHOTOLINE 80 f/6 Triplet APO
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
TS-Optics
UNC 254 f/4 Newtonian Astrograph
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.
Key differences
-53% focal length
-69% aperture
Slower by 2.0 f-stops
Specifications
| Specification | TS-Optics PHOTOLINE 80 f/6 Triplet APO | TS-Optics UNC 254 f/4 Newtonian Astrograph |
|---|---|---|
| Optics | ||
| Type | refractor | newtonian |
| Optical design | Apo triplet FPL-53 | Newtonian astrograph |
| Aperture | 80mm | 254mm |
| Focal length | 480mm | 1016mm |
| Native f/ratio | f/6.0 | f/4.0 |
| Image circle | 44mm | — |
| Full-frame support | No | Yes |
| Physical | ||
| Weight | 4.4kg | 14.0kg |
Advantages of TS-Optics PHOTOLINE 80 f/6 Triplet APO
- Wider field — 480mm vs 1016mm focal length
- Larger image circle (44mm) — supports bigger sensors
- Lighter (4.4kg vs 14kg) — easier to travel with
Advantages of TS-Optics UNC 254 f/4 Newtonian Astrograph
- Tighter framing — 1016mm vs 480mm focal length
- 217% more light-gathering aperture
- Faster optics at f/4 vs f/6
Best for — TS-Optics PHOTOLINE 80 f/6 Triplet APO
- Large emission nebulae and star clusters
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
TS-Optics PHOTOLINE 80 f/6 Triplet APO — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 4.30° × 2.86°Scale: 1.62"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.81° × 1.87°Scale: 1.62"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.35° × 1.35°Scale: 1.62"/px
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
TS-Optics PHOTOLINE 80 f/6 Triplet APO — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
TS-Optics UNC 254 f/4 Newtonian Astrograph — recommended user
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.