What is the best substitute for telescope lenses in making homemade Galilean telescopes?
Tuesday, April 6th, 2010 at
9:19 pm
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US $125.02
There is no substitute – you need lenses of some description. They are _the_ principal component. It is like asking how to make a cup of tea without a cup.
Eyeglass lenses can be used. The first telescopes were made by eyeglass makers from eyeglass lenses they just happened to put together. Find some old broken glasses. Focus the image of a light across the room with the lens. If the lens is far away from the image it makes it has a “long focal length” and will make a good lens for the front end (the objective). If the lens is thick and makes an image very near the lens it will be good for the back end (the eyepiece). Better yet smash a pair of cheap kiddy binoculars (real cheap plastic things) and use the eyepiece from that, it will be the negative lens eyepiece Galileo actually used.