New answers tagged noise
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I would suggest you consider the fact that focus "points" are not really points, but areas. They are often significantly larger than the viewfinder might suggest. Anything in that focus area could be what is focused on, not just what you (as a human) expect.
On some system it also helps if you use the contrast detect focus system in certain ...
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Focus (both auto and manual) can be surprisingly complex and errors are more noticeable at short distances and narrow depth of fields.
In addition to possible user error, there are a number of mechanical factors to be aware of. The one I want to concentrate on is Calibration.
Focusing is performed on a sensor that is not the same as the main image sensor ...
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Some possible reasons the focus distance in the image was closer to the camera than where the autofocus point used was superimposed on the scene at the time the image was taken:
You locked focus and then recomposed. If you are using AF-S focus mode once focus is confirmed the camera will hold the focus at that distance as long as the shutter button is half ...
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JPEG compression artefacts. Choose a different compression setting, or export RAW.
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Is it better to shoot with a higher ISO, or use lower ISO and raise the exposure in post-processing?
You are talking about a digital camera here. If at equal exposure, quality could be improved by lowering the ISO value and digitally amplifying the signal, why would the camera not do it by itself? Where would be the point in artificially making the image worse than it can be?
With film, you could argue that similar techniques could make some sense since ...
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