Re: [APML] Hydogen Alpha Deep Sky Filter Source

[<pedit@email.unc.edu>]

Bill,

I've measured the transmission of the Lumicon H-alpha filter at various 
wavelengths.  Here are some numbers:

wavelength   transmission
     615.5    1.025
     625.5    5.054
     630.5   10.28
     645.0   49.78
     645.5   51.46
     656.0   79.71
     656.5   80.61
     658.0   83.18
     658.5   83.96
     664.0   90.11
     675.5   95.07

Note that transmission is about 80% at the hydrogen alpha wavelength.

Below are transmission numbers for #25, #29, and #92 red filters.

	25.00	29.00	92.00
580.00	0.00	0.00	0.00
590.00	12.60	0.00	0.00
600.00	50.00	0.00	0.00
610.00	75.00	10.50	0.00
620.00	82.60	45.00	0.40
630.00	85.50	73.50	17.40
640.00	86.70	84.20	51.20
650.00	87.60	87.80	72.20
660.00	88.20	89.20	80.70
670.00	88.50	89.80	84.80
680.00	89.00	90.30	86.50
690.00	89.30	90.40	87.40
700.00	89.50	90.50	88.00

The #29 and #92 filters are similar to the Lumicon filter and might 
serve your needs.

Joe

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