Originally Posted by
esearing
What Bob said - but you can get pretty darn close focus with the reflex viewer in normal light. In dim light it is not as useful and with the freznel lens its requries a bit of moving around the eye piece. A large loupe with the sides blacked out is possible too if you also can use your hands to block the light on the ground glass.
Or there's this method from my friend Corran:
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