The Nikon Prostaff 5 Fieldscope 60 (no eyepiece) represent the basic models of Nikon 's Fieldscope series of monoculars and the successor to the RA III series. The bodies of the Fieldscope PROSTAFF 5 monoculars are 20% lighter than the currently used RA III monoculars. The new lens with eyepiece zoom minimizes color defects at the edge of the field of view and offers a large hanging exit pupil for comfortable observation. Three types of eyepiece lenses with digiscoping compatibility which connect to a wide variety of COOLPIX-series compact digital cameras, by using the FSB-series Digital Camera Bracket. The Nikon Prostaff 5 Fieldscope 60 (no eyepiece) is the entry models of Nikon Fieldscopes and successors of the Spotting Scope RA III series. The PROSTAFF 5 Fieldscope main bodies are about 20% lighter than the current RA III spotting scopes.