Here's my entry with the wonderful Pentax 645Z and the incredible HD
Pentax-DA 645 28-45mm F4. 5
This was taken at 31MM at F16, ISO 100 at 1/6th sec.
This was taken at 31MM at F16, ISO 100 at 1/6th sec.
The shutter speed was used to allow for a small degree of movement in the water to be captured but not so slow that the waterflow wouldn't retain some texture. I used a Lee 0.6 soft edged GND to hold back the sky to allow the darker area's closest to me to be exposed without blocking the shadows and I used a 1 stop ND filter additionally to darken the whole scene to allow for that slower shutter speed.
What's so special about the lens. It's the best wide angle zoom ever made for any DSLR. Most wide zooms, particularly on FF formats distort badly, and have soft frame edges - even stopped down. What is truly remarkable about the 28-45 is sharpness is completely uniform centre to edge. This means as a professional landscape photographer I can completely trust the lens and compose the scene how I would like in camera, rather than compose around cropping smeary edges off the frame - or worse still discover the sides of the picture are too soft to pass muster when printing large or supplying for commercial use.Centre to edge sharpness is just as important as back to front sharpness in landscape photography. This lens was the main reason I bought into the 645z system after finding Nikons 14-24, 16-35 hopelessly substandard for my needs.
What's also useful, is the lens has a 82mm filter thread - which is ideal as most landscape photographers do use some sort of filter system.
28-45 is also a really great focal length for landscapes - wide enough to fit everything in without that awful distortion that comes from ultra wide lenses - and long enough to fit in scenes that may not have much foreground at all. It is a lens I can cover the entire of my Glencoe shooting with.