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How was the solid angle of the detected light chosen?

chosen detected light solid
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How was the solid angle of the detected light chosen?

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We picked the large solid angle of the detector partly for greatest sensitivity and partly to be representative of the sky conditions over the part of the sky where people would normally be observing and imaging. It is straightforward to reduce this solid angle with a mask, but different observers have different preferences for beam size and so our design offers the maximum flexibility and customizability. The adoption of a different solid angle would require a fixed zeropoint correction to the meter reading. For equivalent sensitivity at a smaller solid angle, a lens and mounting hardware would be necessary, significantly increasing the cost of the unit for little added functionality.

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