1. Clarity: Clarity mostly affects the transition between light and dark portions of the image (makes it less or more sudden, defined) and visibly alters the micro-contrast of the photograph. If changed extremely, it can also have a slight effect on the overall contrast of the image and shift the color somewhat. When set to a high setting it will make any shapes or forms more defined, starting with small, like skin imperfections, and ending with much bigger ones, like highlights in the background (the circles of bokeh). If you move the slider to the left it will, on the contrary, make the image less defined, give it an almost soft-focus effect, which fits portraits well. For landscape photography, it is often better to move the slider to the right to give a more defined look to textures and shapes. Don’t overdo it though, as it will make your images look too fake and over-detailed.