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Given the fact that (correct me if I'm wrong) camera sensors use the same sensor elements for red, green, and blue, but with a different filter in front, it see
by wyager 10y ago
Given the fact that (correct me if I'm wrong) camera sensors use the same sensor elements for red, green, and blue, but with a different filter in front, it seems strange to me that blue and green are almost eliminated by the cooling but red remains to a large degree. I would expect this distribution if the camera used different photodiode types sensitive to their respective color range.
- planteen 10y agoWhat makes you say that blue and green are eliminated? The stars are still white. The California nebula itself is mostly red. https://en.wikipedia.org/wiki/California_Nebula https://en.wikipedia.org/wiki/California_Nebula
- wyager 10y agoI mean in the noise image.
- aortega 10y agoMost CMOS sensors are much more sensitive in the red/infrared spectrum, that's why all cameras have a IR cut-out filter. This filter is removed in astrophotography cameras (you want all the light you can get) giving aprox. 50% more light gathering, but mostly in red/IR colors.
- wyager 10y agoThat doesn't explain why the noise image is red, given that the noise excitations are endogenous and don't go through the filter, does it? Unless that noise isn't noise at all but IR from the room.
- deleted 10y ago[deleted]