Filters used in acquiring astronomy image data.
- DavidLeodis
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Filters used in acquiring astronomy image data.
I would like to know if Hydrogen-alpha, OIII and SII filters can be used to obtain image data even in daylight I assume that Red, Green and Blue filters have to be used in darkness.
- Chris Peterson
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Re: Filters used in acquiring astronomy image data.
No. The objects that emit at these wavelengths are very dim, which is why narrowband imaging typically requires such long exposures. You can image pretty well under moonlight or light pollution, but the daytime sky is just too bright, even in a band just a nanometer wide.DavidLeodis wrote:I would like to know if Hydrogen-alpha, OIII and SII filters can be used to obtain image data even in daylight :?: I assume that Red, Green and Blue filters have to be used in darkness.
Chris
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Chris L Peterson
Cloudbait Observatory
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- DavidLeodis
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Re: Filters used in acquiring astronomy image data.
Thanks Chris for that very helpful reply, which is appreciated. I had wondered, if like radio astronomy, that the filters may be usable in daylight as well as darkness.Chris Peterson wrote:No. The objects that emit at these wavelengths are very dim, which is why narrowband imaging typically requires such long exposures. You can image pretty well under moonlight or light pollution, but the daytime sky is just too bright, even in a band just a nanometer wide.DavidLeodis wrote:I would like to know if Hydrogen-alpha, OIII and SII filters can be used to obtain image data even in daylight I assume that Red, Green and Blue filters have to be used in darkness.