Luca,
Here are the specs on the Nikon 7X35 Action Extreme, Nikon's latest "Action" 7X35.
http://www.adorama.com/NK735AE.html
The 7X35 Extreme is WP/FP, has twist-up eyecups, and better ER than the Naturalist IV, but weighs 4 oz. more.
http://www.opticspla...binoculars.html
I was recently reading Terrence Dickinson's book Nightwatch (he will be the keynote speaker at my club's Black Forest Star Party in Sept.). This edition was published in 1998. In chapter five (Stargazing Equipment), he writes, "The most common binoculars are the 7X35 size...". I don't know if that was true in 1998, the reference might have been lifted from a previous edition, but it's certainly not true today (except on eBay, where there's always a 7X35 Naturalist for sale). However, there was a time when 7X35s were very popular among birders and stargazers, and for good reason. They are usually compact, lightweight, easily handheld, and provide a 5mm exit pupil, which is good for the adult dark-adapted eye or for peering into dark bushes for birds during the day. The 7X35 will deliver as much light as a 7X50 binocular to most middle-aged eyes, which open on average to a max. of 5mm.
Being a Nikon fan, I considered buying the Nikon 7X35 EX when the Extremes first came out, but after reading a review that compared the 7X35 EX to the Minolta 7X35 Activa WP/FP, I chose the Activa, because it allegedly has better depth of field. The DoF on the Activa was very good and the optics were sharp and very bright, however, they suffered from barrel distortion, most noticeable while panning. Not sure if the Extreme is the same, though barrel distortion is fairly common in wide field binoculars. Even my Audubons have some.
Awhile back, I bought a Nikon 7X35 WF on eBay, and although it was apparently made before 1992 when Nikon switched to multi-coatings on its binoculars, the views are very sharp (sharp as the 7X35 E but w/ a wider FOV -- 9.3* vs. 7.3*). The edges very good for a wide field bin, and it shows very little barrel distortion.
So... Nikon CAN make a wide field bin with sharp optics, good edges, and low distortion, w/out charging an arm and leg, but they don't, probably because 8X42 is a more popular configuration these days. However, I'd bet a Nikon 7X35 WF w/ multi-coatings would be a big seller (especially in the over 40 crowd and particularly among birdwatchers if they made the CF 15' or under). It would also be nice for handheld stargazing under light polluted skies.
Someone wrote on another thread that Nikon planned on discontinuing its "E2" series. Too bad if that's true, it's a "best buy" in quality optics, and if anything, they should add a 7X35 E2 (w/ 9.3* FOV), not kill the line. The dearth of good quality mid-priced porros like the E2 series is already too severe!