The straight viewing Nikon Fieldscope ED50 13-30x50 Spotting Scope is a compact and lightweight spotting scope with a 50mm ED objective lens for chromatic aberration. Nikon especially developed ED glass to provide precise optical color correction.
The ED50 scope is offered as straight or angled viewing design. Most users will prefer angled scopes because they are both simple to use for birds perched high above the viewer as well as easily simultaneously shared amongst users of differing heights. But some will prefer the straight viewing models, for these are much easier to use when hunting down the object of interest in the first place.