>There is one favorite lens of mine (other than the 20mm F2.8
>Nikkor - at any aperture 5,6 through 16) for landscape and
>even the occasional close-up, and that is the older 16mm F3.5
>fisheye Nikkor. It is superb from wide-open through F16 to
>the corners, is easy to hand-hold at absurdly slow shutter
>speeds, has a nice proportioning of near and far objects,
>makes universal depth-of-field easy, can show a large subject
>area in one photo - including relationships between the parts
>of a large subject area, and it is reasonably priced (though
>I do still occasionally use my 15mm F5.6, also). The 16mm
>F3.5 (and 2.8) is very sharp on TC14A converter for a
>narrower angle of view. One caviat: must put the horizon in
>the middle, unless it is obscured by terrain irregularities,
>folliage, etc. (not necessary with close-ups). Overhanging
>trees, interesting clouds, rock formations, people, etc.
>can be placed in frame to make the central horizon make
>sense aesthetically. Hope this helps.
>