Quote:
Originally posted by ving
so what happens if they are on your eyes? i'd have thought the effect would be the same(ish)
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The power density is much higher after the binocs. Before binocs: assuming 50 mm apertures, 3927 mm^2 of filtering area
After binocs: assuming 10x mag = 5 mm exit pupil, 157 mm^2 of filtering area.
So each part is absorbing 25 times more energy if you use the filters between the binoculars and your eyes.
Now lets say you have a 100 mm refractor with a 5 mm exit pupil and an eyepiece filter. 400 times more energy absorbed per area. No wonder the bloody things break.