▁be ▁carried ▁( bird watch ing , ▁hunting ), ▁users ▁opt ▁for ▁much ▁smaller ▁( l ighter ) ▁bin oc ular s ▁with ▁an ▁exit ▁pup il ▁that ▁matches ▁their ▁expected ▁ir is ▁diameter ▁so ▁they ▁will ▁have ▁maximum ▁resolution ▁and ▁are ▁not ▁carrying ▁the ▁weight ▁of ▁was ted ▁a pert ure . ▁ ▁A ▁larger ▁exit ▁pup il ▁makes ▁it ▁easier ▁to ▁put ▁the ▁eye ▁where ▁it ▁can ▁receive ▁the ▁light : ▁anywhere ▁in ▁the ▁large ▁exit ▁pup il ▁cone ▁of ▁light ▁will ▁do . ▁This ▁ease ▁of ▁pla cement ▁helps ▁avoid , ▁especially ▁in ▁large ▁field ▁of ▁view ▁bin oc ular s , ▁v ign et ting , ▁which ▁brings ▁to ▁the ▁vie wer ▁an ▁image ▁with ▁the ▁borders ▁dark ened ▁because ▁the ▁light ▁from ▁them ▁is ▁partially ▁blocked , ▁and ▁it ▁means ▁that ▁the ▁image ▁can ▁be ▁quickly ▁found ▁which ▁is ▁important ▁when ▁looking ▁at ▁birds ▁or ▁game ▁animals ▁that ▁move ▁rapidly , ▁or ▁for ▁a ▁se aman ▁on ▁the ▁deck ▁of ▁a ▁pitch ing ▁boat ▁or ▁ship . ▁N arrow ▁exit ▁pup il ▁bin oc ular s ▁may ▁also ▁be ▁fat igu ing ▁because ▁the ▁instrument ▁must ▁be ▁held ▁exactly ▁in ▁place ▁in ▁front ▁of ▁the ▁eyes ▁to ▁provide ▁a ▁useful ▁image . ▁Finally , ▁many ▁people ▁use ▁their ▁bin oc ular s ▁at ▁d usk , ▁in ▁over cast ▁conditions , ▁and ▁at ▁night , ▁when ▁their ▁pup ils ▁are ▁larger . ▁Thus ▁the ▁day time ▁exit ▁pup il ▁is ▁not ▁a ▁univers ally ▁des irable ▁standard .