Peter Zetner
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05-OCT-2013
montage_spectrohelio0018_Y083_enhance.jpg
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amplelight
06-Oct-2013 01:19
check out optigrate.com , and click on the braggrate bandpass filter.
you can request a custom coating at 393nm. These are the future of spectro-helioscopes imho. Just need to get the cost of them down to amateur prices.
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