Every time I go out to photograph, even for a causual shoot at local locations, I am quickly reminded that to make high-quality photographs (and by high-quality in this discussion I mean sharp, well exposed images) I often have to make compromises. Low noise with low ISO, or quicker shutter speed (and possibly a sharper image) with a higher ISO, along with its higher noise. If I catch myself without proper stabilization, such as a tripod or monopod, and the light is marginal, then I begin making judgement calls. Other factors that come into play are aperture, lens quality at certain range of use, subject matter (moving or stationary), and others.
Photography has many dimensions, and one is this mental process the photographer must go through to evaluate all of the factors that are present, some in his control and some not. A solid working knowledge of one's equipment is critical to being able to make judgement calls that just cannot wait. E.g. a deer that won't hang around much longer, sunlight that is beoming stronger by the second, water disturbance that is making its way towards your subject, and so on. This working knowledge allows one to anticipate what actions could be taken, what settings should be set, what buttons to push and dials to turn, all without spending critical seconds thinking about them.
On a slightly related note this morning I found myself out in the same sunny conditions that have been hanging around for a week or two now. I know that most of my favorite images have been made in diffused light, so I was not crazy about the lighting, but since I have only a few hours a week (if that) to photograph I often have to take what I can get. I was happy to have been able to use fast shutter speed and low ISO, and the images are very sharp as a result, but I was also slightly disppointed by the results because of the full sun, albeit low morning sun.
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