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Astronomy and Cosmology
Astronomy and Astrophysics
Exploring the Sun: Amateur Solar Imaging Techniques
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[QUOTE="Andy Resnick, post: 5848442, member: 20368"] I tried some solar imaging this weekend, using a few 'random' color filters (in addition to an ND3 = 0.1% transmission): 1) BG3 glass ([URL]https://www.pgo-online.com/intl/curves/optical_glassfilters/BG3_BG4.html[/URL]) 2) RG645 glass ([URL]https://www.newport.com/p/FSQ-RG645[/URL]) 3) a 436/10 bandpass filter (band pass is 436 +/- 5 nm) 4) some UV bandpass filters: a 380/40 and 365/20 I realize the bandpass range of these filters far exceeds 'typical' solar filters, but this is what I have. I couldn't tell at the time, but none of the images came out very well- the exposure guide was apparently totally useless and all 3 images were overexposed in their particular channel (R,G, or B). The UV filters didn't work out at all, I guess the Bayer filter and whatever else is put on the sensor cuts off below 400nm or so. That said, it felt like 90°C at the time (it was 'only' 90°F) and I wanted to get out of the direct sun ASAP. There was spectral bleed-through: for example, the RG645 image has blue and green components that are properly exposed. One potentially interesting 'feature' is that the sunspot contrast was highly variable- there appeared to be no sunspot when using the 436/10 filter. I'll probably try filters 1-3 again, if for no other reason than to generate separate RGB images. [/QUOTE]
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Astronomy and Cosmology
Astronomy and Astrophysics
Exploring the Sun: Amateur Solar Imaging Techniques
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