The range
Two 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/3.9 · Sony IMX347
A 114 mm Newtonian with enhanced vision: a mirror telescope, with no eyepiece. The image builds on the phone, minute after minute.
1h on l'Origin = 3h 09m here
- Aperture
- 114 mm
- Weight
- 9 kg
- Indicative price
- ≈ €2,599
Used for this site
f/3.8 · Sony 3.4 Mpx, 1.45 µm photosites
An 85 mm Newtonian with enhanced vision: Unistellar's compact format. Four kilos of tube, instead of the nine of the eQuinox 2. Only the Origin is faster.
1h on l'Origin = 2h 59m here
- Aperture
- 85 mm
- Weight
- 4 kg (6.5 kg with the tripod)
- Indicative price
- ≈ €2,399
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.