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Thanks bojan,
The idea that I am working on works with a photo interrupter (Jatycar part no. ZD1901) and a strip printed on a overhead transparency. I was thinking of using a very wide arc to give me greater resolution.
The question is though how many arc seconds do these encoders have to be accurate to? If I am using a push to I wouldn't be able to adjust my scope to down to 1 arc sec.
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