Another post that I wrote just before this one (“Why Your 21MP File “Looks Softer” Than Your 12MP File at 100%“) explains why pixel-peeping* photographers might imagine that cameras with greater photosite density (e.g. – “more megapixels”) might produce “softer” photographs, based on what they observe when they compare 100% magnification images on the screen. These cameras do not produce softer images – the results will either be equal to or better than those from lower photosite density cameras in this regard. You can follow the link to read the original post.
A reader wrote and suggested that perhaps the images from the camera with greater photosite density really are softer, but the cause is a greater susceptibility to diffraction blur or motion blur.
A Sierra Nevada creek, swollen from spring runoff, flows across granite slabs – Yosemite National Park.
The image and sound of spring runoff water rushing over granite slabs are common in the high Sierra. Though the scene is almost a generic one, for me it also brings to mind many very specific places and experiences throughout the range. (Some of my backpacking friends might think of a spot along Tyndall Creek on the John Muir Trail where we have camped more than once.)
The exact location of this little bit of cascading and rushing water is probably not very important – you are never far from a little scene like this if you are near almost any little creek high in the Sierra! Here the water flows mostly across very smooth rock – so smooth that you can see right through the rushing water to the rocks in many places. In this precise spot there is a weakness in the rock and a small ledge has formed, and the result is a bit of white water.
I’ll share a few technical observations about this photograph, too. First, there isn’t a sharp thing in the image! While sharp focus can be important, I don’t think it is here. (Though if you look closely, the patterns of the blurred, fast-moving water are sharp in a fuzzy sort of way. ;-) The rocks beneath the water cannot be sharp because they are blurred by the water; the water cannot be sharp since I intentionally chose a shutter speed that allowed motion blur. Second, I have to admit that I did not originally have a black and white photograph in mind when I made this exposure. I worked on it for a while in color and though I liked the motion of the water I just wasn’t happy with the coloration of the scene. I finally realized that this image wasn’t about the “reality” of the rocks and water but about creating an impression of the rushing water – and that perhaps monochrome might work. Third, this is yet another “landscape” photograph made with a lens that the “common wisdom” (which often turns out to be not so wise) would say is not a landscape lens – a 70-200mm zoom.
Sunlight reflects on granite ledges next to cascades on Tenaya Creek.
In this iteration of the “blurry-fast-moving-water-in-Sierra-creek” photograph, I was looking to cram a variety of elements into the frame – as you can see, the entire photograph is not filled with water. There is a transition from white water with flashes of sunlit light at the tops of the waves, through the water with smaller areas of foam, to water reflecting the golden late afternoon light from a cliff face on the other side of the creek, to some bits of streamside granite slabs along the lower right edge of the frame. To me, these areas of shallow water and wet rock reflecting more distant light almost have a molten quality.
One of the trickiest things about this photograph for me was dealing with the strong contrast between very blue tones in the shaded parts of the water and the very warm tones of the reflections. As every photographer knows, the light in shade can be very blue, especially when the subject is supposed to be white and is lit almost entirely by the blue sky, as is the case in parts of the turbulent water. Adjustments are necessary in order to make it look realistic and conform with the colors that our eyes tell are are there. (Our vision system is remarkable… but it is not objectively accurate!) But adjustments to the blue water, if applied to the warm tones of the reflecting granite, can end up looking bizarre and overdone in the opposite direction!
Turbulent whitewater flows through an area of steep granite along Tenaya Creek, Yosemite National Park.
You can, of course, find a place to shoot subjects like this one all over the Sierra and no doubt in many other places as well. This photograph was made during a period of relatively high water early in the season and in a spot where the water flowed over some rocks in shade. Sunlight on the other side of the stream reflected into the water and revealed highlights, especially the flying spray that I allowed to blur with a somewhat slow shutter speed.
The moving water in Sierra streams and rivers seems to be an almost irresistible subject for many photographers, and I confess that I count myself among them. In some ways it is almost too easy to make these photographs, and one basic requirement is a willingness to make quite a few exposures. The instantaneous motion of the water and the reflections of light simply cannot be controlled or predicted, so one almost has to make many, many exposures. Of course, there is a bit more to it than pointing the camera at water and then repeatedly pressing the shutter release. It is important to find some sort of compositional interest first – it could be where water flows around or over a rock, a place where the light catches the water, or possibly just the twisting forms of turbulent water. Light is extra important in these photographs I think – most often the colors come from a combination of the blue-green shades of water full of foam and from reflected light from things that are out of the frame. (In this photograph, the light mostly comes from sunlight reflected off of granite on the far side of the stream.) Shutter speed is an important consideration, as a short exposure will stop or nearly stop the water and freeze the motion, a somewhat longer exposure can hold some detail but still allow blur along the direction of the flow, and very long exposures can create a misty and diffuse effect.
Photographer and visual opportunist. Daily photos since 2005, plus articles, reviews, news, and ideas.
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