can be carried out by altering the aperture, however, this will also affect ambient light and the depth of field. If, in manual mode, a camera defaults to alter the shutter speed, it might be necessary to swap the parameters used for shifting in order for the camera to alter the aperture instead. Since the flash may need time to recharge between the shots, some cameras fall back to single-advance drive mode during auto flash bracketing, even if they are otherwise configured for continuous-advance drive. ISO Automatic ISO bracketing simulates exposure bracketing by altering the ISO or signal gain prior to conversion of the image to JPEG or other image file format. The actual exposure values (aperture and shutter speed) are usually kept constant. Auto ISO bracketing is not a common feature of digital cameras. White-balance Another common form of autobracketing is white balance autobracketing (sometimes abbreviated to WBB for white balance bracketing); this applies only to digital cameras, not to film cameras. This function provides a way of dealing with mixed lighting by having the camera take one shot and process the raw sensor data several times for slightly different white point settings, with both higher and lower color temperatures (bluer and redder) compared to the current setting on the camera. Typically, the amount of offset can be configured. Since shooting in a camera's raw format (if supported) the white balance can be arbitrarily changed in postprocessing as well at a later stage, white balance bracketing is particularly useful for reviewing different white balance settings in the field. Focus Depth of field The Minolta Maxxum 7's STF function is an automatically calculated and pre-compensated seven-fold multi-exposure with depth-of-field bracketing which emulates the smooth bokeh effect of Smooth Trans Focus. Dual-bracketing Some cameras which provide bracketing of two parameters at the same time. Notes References External links Auto exposure bracketing explained and examples of how it is used Camera features Photographic techniques