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diy telescope making


dagodave

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hello i have been given a set of lenses from an old overhead projector there are three pieces  6.5cms across  one is bi convex norther is convex and the final is bi concave but of unequal depth (hope i got the terms right  i was thinking to use these for the prime lens but what could i use as the secondary lens  they seem to be of good quality glass and i would like to put them to use   any help would be great   many thanks   dave c

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