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Yes, you will need a diagonal, or an extension tube. The image is upside-down because in a straight-thru' configuration, the light is is inverted. Ditto straight-thru' finders. This is the reason that so many photos and illustrations, particularly in older, sky guides, show the objects inverted and back-to front.
A star diagonal adds a 'kink' in the light-path and therefore "re-inverts" the image to right side up"
Enjoy your new gear.
PJH
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