telescope
Askar
FRA400
72mm Petzval Quintuplet APO · 400mm f/5.6
Quintuplet Petzval astrograph.
Best for
- Large emission nebulae and star clusters
- Full-frame astro cameras and DSLRs
Specifications
| Optics | |
| Type | Refractor |
| Optical design | Petzval Quintuplet APO |
| Aperture | 72mm |
| Focal length | 400mm |
| Native f/ratio | f/5.6 |
| Image circle | 44mm |
| Full-frame support | Yes |
| Physical | |
| Weight | 3.9kg |
Typical FOV & image scale
With Full-frame (36×24mm, 3.76µm)
FOV 5.16° × 3.44°
Scale 1.94″/px
With APS-C (23.5×15.7mm, 3.76µm)
FOV 3.37° × 2.25°
Scale 1.94″/px
With IMX533 square (11.3×11.3mm, 3.76µm)
FOV 1.62° × 1.62°
Scale 1.94″/px
Recommended accessories
- Askar ASKAR 0.8x Reducer for FRA400/FRA500reducer · 0.8× focal lengthmanufacturer supported
- Askar FRA 0.7x Reducerreducer · 0.7× focal lengthmanufacturer supported
- Askar FRA 1.0x Flattenerflattener · 1× focal lengthmanufacturer supported
Typical targets
- Messier M33 — Triangulum GalaxyGalaxy · 73′
- IC IC 2944 — Running Chicken NebulaEmission Nebula · 75′
- IC IC 5070 — Pelican NebulaEmission Nebula · 80′
- NGC NGC 2237 — Rosette NebulaEmission Nebula · 80′
- Messier M7 — Ptolemy's ClusterOpen Cluster · 80′
- IC IC 434 — Horsehead NebulaEmission Nebula · 60′
Recommended cameras
28.4mm sensor · 4.78µm px · cooled
Compare pairing28.3mm sensor · 3.76µm px · cooled
Compare pairing28.3mm sensor · 3.76µm px · cooled
Compare pairing