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Forum: Pentax K-1 03-10-2017, 04:22 AM  
Was I expecting too much?
Posted By Ian Stuart Forsyth
Replies: 56
Views: 5,448
DR is really dependent on the amount of light that is gathered from the exposure. Increase the iso by 1 stop you decrease how much light the sensor can store by 1 stop. If you decrease the amount of light that is captured then the size of the image that you can view it without seeing noise decreases. You also have to remember the majority of the noise you see in an image is that of shot noise ( how light its self randomly falls on the sensor) with increased resolution you can see how that light randomly falls on the sensor and this appears as noise ( the variation from pixel to pixel ). If you have enough signal then that variation is not seen pixel to pixel, when you decrease the signal then you have a greater chance of see that variation from pixel to pixel starting in the areas that are made up from less light ( the shadows)
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