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After setting one of the fixed presets, you can freely change the values; in that case, the Presets dropdown will change to Custom.

The rest of the parameters in this section work in the same way as in a normal camera:

• ISO: it controls the sensitivity of the camera. If your render is very dark, try rising this value before trying to increase the light intensities. Higher values mean a brighter render.

• Shutter (1/s): this is the shutter speed. It affects the amount of light that enters the virtual camera and the motion blur. It is expressed in 1/n seconds, so, the higher the number the smaller the time opened and the darker the image. When the objects are animated, Maxwell will automatically produce motion blur; the higher the shutter value, the smaller the motion blur.

• Fstop: this is the aperture of the diaphragm. It affects the amount of light that enters the camera and the depth of field. 1 means the diaphragm is fully open, so the smaller the number means more light that enters the camera and smaller the depth of field (a smaller area in focus and stronger blur effect).

• EV: this is the exposure value. It is linked to the shutter speed and it’s a quick way of setting the general illumination level of your image. Lower values are meant for darker scenes and will brighten up the image. Higher values are meant for brighter scenes.