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Descrição
These are a few stands for lenses, mirrors, LEDs and cards to help children play around with optical properties by freely moving them around seeing what they can do.
Great for also calculating focal length of your 25 and 27mm lenses.
Speaking of lenses, where does one acquire one? I'm sure there are others, but here's a good place to order lenses for about 10 or 15 bucks a pair:
Have fun!
November 23rd, 2015 update: Added the 1" Prism Stand. One side of the equilateral base of the prism should be 1"
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