telescope
Askar
71F
71mm Petzval quintuplet FPL-51 · 490mm f/6.9
Flat-field quintuplet.
Best for
- Large emission nebulae and star clusters
- Full-frame astro cameras and DSLRs
Specifications
| Optics | |
| Type | refractor |
| Optical design | Petzval quintuplet FPL-51 |
| Aperture | 71mm |
| Focal length | 490mm |
| Native f/ratio | f/6.9 |
| Image circle | 44mm |
| Full-frame support | Yes |
| Physical | |
| Weight | 3.2kg |
Typical FOV & image scale
With Full-frame (36×24mm, 3.76µm)
FOV 4.21° × 2.81°
Scale 1.58″/px
With APS-C (23.5×15.7mm, 3.76µm)
FOV 2.75° × 1.84°
Scale 1.58″/px
With IMX533 square (11.3×11.3mm, 3.76µm)
FOV 1.32° × 1.32°
Scale 1.58″/px
Typical targets
- IC IC 434 — Horsehead NebulaEmission Nebula · 60′
- NGC NGC 869/884 — Double ClusterOpen Cluster · 60′
- NGC NGC 2264 — Christmas Tree ClusterEmission Nebula · 60′
- NGC NGC 6992 — Eastern VeilSupernova Remnant · 60′
- NGC NGC 7822 — Cepheus HII RegionEmission Nebula · 60′
- Messier M48 — Open Cluster M48Open Cluster · 54′
Recommended cameras
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Compare pairing28.3mm sensor · 3.76µm px · cooled
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