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How to create a solar filter for Mercury transit
#2
Hello,

A 10 stop filter reduces the intensity of the light by a factor of 1000x. So what you would do is to create a filter that is 0.001 at all wavelengths. SkyTools expects the data at regular wavelength intervals and the first and last pairs to be zero when reading data from a file. So it could look something like this:

300 0.0
350 0.001
400 0.001
450 0.001
500 0.001
550 0.001
600 0.001
650 0.001
700 0.001
750 0.001
800 0.001
850 0.001
900 0.001
950 0.001
1000 0.001
1100 0.0

To add the IR blocking filter you would need to know the IR cutoff wavelength. Enter zeros for the transmission after the cutoff. So if the cutoff was 930 nm, then 900 nm would be 0.001, and 950 nm would be 0.0. You would stop there.

You might want to use a smaller interval, such as 10 nm. But the idea is the same.

Nice pictures!
Clear skies,
Greg

SkyTools Developer
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RE: How to create a solar filter for Mercury transit - by theskyhound - 2019-10-21, 05:57 PM

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