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andrews b/viewer is similar to other 300 models like WO & stellarvue - the difference is the included ep's. WO & stellarvue make a nosepiece though to help achieve focus - but it comes down to pairs of ep's and the position of your mirror.(you may need to move it or change focuser to get focus)
from my experience tough they do cut down a fair amount of light, but are great for the moon/jupiter
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