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Message: <blockquote data-quote="sonicbuffalo_RIP" data-source="post: 398489" data-attributes="member: 21543">I can try and answer 1)  Busch's Field Guide book says,"Press the Fn button to view or hide the verticle horizon indicators that appear in the image area in the bottom and side of the viewfinder frame.  When the camera is held in horizontal orientation, the scale at the bottom shows the degree of roll around the lens axis.  With the camera in a verticle (portrait) orientation, the scale appears at the top or bottom of the frame (depending on which way you rotated the camera)."That's about all the enlightment I can give.  Hope it sheds some light.  Good luck with the D7100.</blockquote>