Muaj ntau lub lo ntsiab muag nyob rau hauv lub Scope, tsis yog ib tug sib txawv koj pom, koj yuav pom qhov pom raws li ib tug ntev raj, nws tsis yog ib tug taw tes xwb, tab sis kuj yog cov teeb meem parallax tshwm sim los ntawm qhov zoo ntawm qhov pom, qhov pom zoo yog { {0}} parallax, uas yog, txawm tias qhov muag saib nyob rau hauv, nws yog sib npaug rau koj aiming ntawm qhov chaw nruab nrab.
Txawm hais tias optical los yog reflective, lub teeb liab yog tib yam.