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Message: <blockquote data-quote="Horoscope Fish" data-source="post: 503601" data-attributes="member: 13090">It depends on how you are connecting your spotting scope. Are you attaching the camera body directly to the spotting scope using an adapter, or are you attaching the camera with lens attached to the spotting scope using step-rings? Camera lenses have apertures that open and close and correspond to an f/number like f/5.6 or f/4. Spotting scopes do not have an aperture so they do not use f/numbers. So, again, how you are going to control exposure will be determined by how you are attaching the scope to the camera.....</blockquote>