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That is valid only for point sources. Stars are not points when seen in a telescope because of airy disks, atmospherical scattering and imperfections in the opt
by tigershark 10y ago
That is valid only for point sources.
Stars are not points when seen in a telescope because of airy disks, atmospherical scattering and imperfections in the optics.
If you have perfect optics, you are outside of the atmosphere and the only limit is the airy disk then yes, for point sources you don't have that problem.
Now, are you saying that a valley is a point source?
- greglindahl 10y agoIf you look back, I made a statement about the number of photons collected. I totally understand that camera people, who have a shitload of photons available most of the time, don't think about them like astronomers do. But if it's very dark, it becomes astronomy.