Nikon's Fieldscope line of spotting scopes are premium offerings to compete with the best of sports optics manufactured in Japan or Europe. You choose your options based on concerns for mass and budget: straight or angled, 60mm or 82m objective diameter and whether to spring for the ED (extra-low dispersion) glass for more favorable appreciation of highly detailed subjects.
The Fieldscope 82mm ED is Nikon's flagship model for serious birders. They've pulled out all the stops to make a full-throttle scope that's easily handled and thinks nothing of impending weather conditions. Extra-low dispersion glass gives nearly perfect color focus upon a single plane, and with contrasty, intricate or glare-filled situations you can genuinely observe the difference.
It is entirely a matter of personal preference, and no one can say definitively whether you will prefer a straight or angled scope until you experience them both. But common wisdom says that straight scopes are easier to initially locate your subject, as well as being a bit shorter, lighter and less expensive to manufacture.
Amongst the very short list of Japanese-made ultrapremium spotting scopes, the Nikon 82 ED Fieldscope arrives to you with the Vue-Thru case. This valuable accessory is quite nearly a necessity, and is not included but rather an expensive additional option with the European-made ultrapremium units.
All of Nikon's spotting scope line is backed up by the "No-Fault" lifetime warranty. Regardless of what happens to your scope-even of your own negligence-Nikon will repair or replace (at their option) your scope for just $10 plus the return shipping costs.