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Polemaster field of view question


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Anyone know if the polemaster will work in this location? It did on the top of the losmandy plate (maybe 100mm further from axis) but I wonder if my tube will obscure the view?

I read a field of view of 11x8 degrees. My polemaster is 450mm from the end of the tube and 50mm above the tube. If my math is right then a 4° angle at 450mm is 31mm so the polemaster shouldn't be obstructed?

Proof will be in the test next clear night but interested to hear what people think. 

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