50-100

So the exit pupil is the same size as the eye iris whether it is 3mm or 7mm depending on object brightness (assuming the eyepiece lens on the galilean is at least a little larger than 7mm diameter to avoid clipping the light bundle to the eye). This is why galilean optics always have bright images even at night (also that they have no prisms to absorb light and very few air-glass surfaces ... ................
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