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Post			Author	Forum	Replies	Views	Posted [asc]
		Thread: Filters Post: RE: Filters I learned from a colleague that not all glass is the same. He worked a summer in greenhouses cutting tomatoes and came back with a deep tan, despite always being "inside" under the glass roof of the g...	Speicus	General Topics Here	6	9,400	03-14-2018, 10:24 PM
		Thread: Filters Post: Filters What do sextant filters filter? I think this is an important question when looking at the sun. If only visible light is filtered, my pupil widens and lets all ultraviolet through, like with low qua...	Speicus	General Topics Here	6	9,400	02-17-2018, 03:21 PM

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