The range
Three devices in the comparison
Rapport d'ouverture : the focal length divided by the diameter, written f/, and the smaller that number, the faster the image forms. Monture azimutale : it moves in altitude and in rotation, but the field turns during the night.
f/4,9 · Sony IMX585, format 1/1,2 pouce, 11,2 × 6,3 mm, photosites de 2,9 µm
A 50 mm apochromatic quadruplet with a flat field, with baffling against stray light. Large 2.9 µm photosites: it is quick, where the Pro 2 is fine.
1h on l'Origin = 4h 58m here
- Aperture
- 50 mm
- Weight
- 5 kg
- Indicative price
- ≈ 2 490 €
f/4,9 · Sony IMX676, format 1/1,6 pouce, 7,0 × 7,0 mm, photosites de 2 µm
Same optics as the Vespera 3, square 12.5 Mpx sensor with small photosites. Mosaics up to 50 Mpx: together with the Vespera Pro, the highest final resolution of the devices compared here.
1h on l'Origin = 4h 58m here
- Aperture
- 50 mm
- Weight
- 5 kg
- Indicative price
- ≈ 2 990 €
f/5 · Sony IMX676 STARVIS 2, 12,5 Mpx
A 50 mm apochromatic quadruplet in S-FPL52 glass: four lenses, with no colour fringing. 12.5 Mpx sensor, mosaics up to 50 Mpx. It is the generation before the Vespera Pro 2, and Vaonis still sells it.
1h on l'Origin = 5h 10m here
- Aperture
- 50 mm
- Weight
- 5 kg
- Indicative price
- ≈ 2 790 € (coffret de filtres ≈ 699 € en plus)
Used for this site
This equivalence says nothing about resolution, about the field or about optical quality: f/2,2 on 152 mm and f/5,3 on 30 mm do not photograph the same objects. Worked out from the published focal ratios alone, with sensor, sky and target held identical.
not in the comparison
Vaonis Hestia, ≈ 200 € en pack Essentiel, is not in this range and has no line in the comparison. Its entry exists, and it says why: This is not a smart telescope. Six lenses, 30 mm, no motor, no tracking, no sensor. The image forms in the camera of the phone you set on top of it. The comparison table has the sensor, the mount and the focal ratio for its columns. Filing the Hestia there would blur the category instead of lighting it up. So it has its entry, and it has no line.