Backyard Calcium K
Filters
Lunt Solar Systems
http://www.luntsolarsystems.com/
Baader Calcium K Filter
The first "stacked" 1.25" filter
for digital cameras and webcams. Used for taking images of the sun's
Calcium spectral line. The filter permits the 393nm and 396nm lines,
resulting in an intensely blue image. The filter is particularly
suited for reflecting telescopes. If used with a refractor the
telescope should have a good contrast in the blue spectral region.
http://www.telescope-service.com/baader/solar/solar.html#BaKa1
DayStar
Calcium K and H Filters
http://www.daystarfilters.com/calcium.shtml
What is CaK? |
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