Quote:
Originally Posted by tnbk00
Im not sure with regards to shooting stars (pardon the pun) but in order to get good colour saturation with terrestial things such as sunsets etc I have always found under exposing by a stop on the light meter works a treat. This is a practice that I have been told works with slide and film, and should translate directly to digital. I dont know how this will translate to astrophotgraphy.
Daniel
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It will translate directly, as you indicated.
The problem with digital is the linear response of the sensor, and the finite amount of electrons each pixel can hold. When this finite amount is reached, thats it, saturation is here.
Film suffers from the same problem but because the response is logarithmic,
it takes a lot more light to reach the saturation.
The problem with digital sensors is also scattering, which means the red light, for example will also saturate the green sensor next to it. The end result: stars with no colours.
The only way to help this situation is to use monochrome cameras with filters, and not DSLR's. The sensitivity will also be way better, up to 3x....
Or, to treat DSLR as a monochrome camera, and shoot with filters.
This will result in a need of prolonged exposure times, but we have a lot of that
. Somebody should try this and let me know how it went.. I will not sue for the breach of patent rights for this idea
BTW, DSLR's are not astrocameras, they just happen to deliver acceptable results when used as such. So we have to compromise (unless we can spend k$ on REAL equipment, and many of us just have other priorities in their lives)