![]() There is a second crystal used to double the frequency, and half the wavelength down to 532nm, providing green light. Thanks for the comment! Actually, it's a bit more complicated: "The most common green lasers are actually infrared lasers, emitting natively 1064nm light. DO NOT USE SOLAR FILTERS NOT RATED FOR A TELESCOPE OR BINOCULARS WITH A TELESCOPE OR BINOCULARS. This has nothing to do with the magnification (stars other than the sun are so far away that they are basically a point for any amateur equipment), and everything to do with the fact that the lenses are gathering light from a much larger area.Proper telescope-rated solar filter material is not expensive: And binoculars are just a pair of telescopes.I am sorry for going on and on about this, but this is a very important safety point. You will see a lot more stars that are too dim to see with the naked eye. Since the light-gathering area is proportional to the square of the diameter, the 20mm binoculars will gather between 6 and 100 times as much light as the naked eye will, as long as we're dealing with an object that fits completely into the field of view-which the sun does.You can safely test how much brighter the images from binoculars are-even really small binoculars-by looking at the night sky. Pretty much the smallest diameter of commercial binoculars is 20mm, and 30mm is much more common. Typical small binoculars have a field of view more than sufficient to contain the sun: the sun takes up 0.5 degrees of sky, and the true field of view of typical small binoculars is at least 7 degrees.The eye pupil gathers light from at most an 8mm diameter disc, and only a 2mm disc in bright light. I'm afraid not, at least not for binoculars whose field of view is big enough to contain the whole solar disk. Since the light-gathering area is proportional to the square of the diameter, the 20mm binoculars will gather between 6 and 100 times as much light as the naked eye will, as long as we're dealing with an object that fits completely into the field of view-which the sun does.You can safely… see more » ![]()
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