telescopecomparison · 2-way
TEC APO140FL f/9.6 vs Askar 151PHQ
TEC
APO140FL f/9.6
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Askar
151PHQ
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.
Key differences
+27% focal length
-7% aperture
Slower by 2.6 f-stops
Specifications
| Specification | TEC APO140FL f/9.6 | Askar 151PHQ |
|---|---|---|
| Optics | ||
| Type | refractor | refractor |
| Optical design | Apo triplet fluorite | Petzval quintuplet FPL-51 |
| Aperture | 140mm | 151mm |
| Focal length | 1345mm | 1057mm |
| Native f/ratio | f/9.6 | f/7.0 |
| Image circle | — | 60mm |
| Full-frame support | No | Yes |
| Physical | ||
| Weight | 7.7kg | 15.5kg |
Advantages of TEC APO140FL f/9.6
- Tighter framing — 1345mm vs 1057mm focal length
- Lighter (7.7kg vs 15.5kg) — easier to travel with
Advantages of Askar 151PHQ
- Wider field — 1057mm vs 1345mm focal length
- Faster optics at f/7 vs f/9.6
- Larger image circle (60mm) — supports bigger sensors
Best for — TEC APO140FL f/9.6
- Small galaxies, planetary nebulae, lunar & planetary detail
- High-resolution long-exposure work
Best for — Askar 151PHQ
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
TEC APO140FL f/9.6 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 1.53° × 1.02°Scale: 0.58"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.00° × 0.67°Scale: 0.58"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.48° × 0.48°Scale: 0.58"/px
Askar 151PHQ — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 1.95° × 1.30°Scale: 0.73"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.27° × 0.85°Scale: 0.73"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.61° × 0.61°Scale: 0.73"/px
TEC APO140FL f/9.6 — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Askar 151PHQ — recommended user
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.
