The exposure variable ISO Most of the cameras are ready to expose manually in the same way: We set the aperture and shutter speed choose either fix the shutter speed and select the aperture. Both modes like aperture priority shutter priority as manual work in the same way. In all cases we work on a previously selected ISO.
landscapes Interestingly there is another way of working that does not correspond to any mode of the camera and that would be useful to exhibit in many situations: we may call "ISO priority."
opening in a landscape always depends on the depth of field is fixed, we have very little freedom to choose the opening as this we would change the depth of field and generally is a luxury we can not afford in a landscape.
In certain situations, especially when we are moving objects like water or clouds, and we want to achieve a certain effect, we find that the shutter speed is also limited. For items such as photo speed between 1 / 2 and 1 / 8 of a second worked well while faster or slower did not achieve the effect we wanted in the photo.
Then when the aperture and shutter speed are almost fixed and unchanging the only variable that remains to expose the ISO. We seek ISO derechea the histogram between native ISOs the camera. Fortunately with modern DSLRs have a good range of potential exposures since from ISO 100 to ISO 1600 the results are usually perfectly acceptable.
Unfortunately the cameras do not come with a third caster with which to move the ISO to achieve adequate exposure, for some reason the manufacturers assume that the ISO is determined first and after exposure but in reality there are situations like the one presented in which it is determined is open and is variable speed and ISO.
