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Not easily done as you add length to the optical path and to surmount this you usually have to shorten the tube unless the finder was already designed this way in which case you need an extension for straight through operation.
Note a right angle finder will reverse the image left to right no longer matching the sky or star chart. A Corrected Image Right Angle finder (RACI) will correct the image and match the sky and star chart. Depending on your head and telescope orientation may mean a rotation of any chart but at least it will not be reversed when using an RACI finder.
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