![]() ![]() Look at professionally-made solar filters for telescopes, they are specifically fitted to the scope's external diameter, and have various mechanisms to secure them in place, such as triple screws, etc. HOWEVER, even mounted ahead of the scope, any improvisation with regard to solar filters is bound to come back and bite you in the ass sooner or later. DO NOT use eyepiece filters when looking at the Sun. In front of it, ahead of it, on top of it. You could put the filter after the instrument, provided you don't mind being blind - the concentrated energy from the Sun heats up the filter, which sooner or later melts (if it's plastic) or cracks or explodes (if it's glass), your eye(s) receive a full dose of that energy, say hi to the white cane and the friendly guide dog.ĪLWAYS, ALWAYS, ALWAYS use solar filters installed in front of the instrument (telescope, binoculars, etc.). Placing the solar filter before sunlight hits the instrument is the correct way of doing it. ![]()
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