Editing Bracketing (section)

==={{anchor|Focus}}Focus bracketing===
<!-- This section is linked from inside or outside this article, preferable by "#Focus". Do not rename without keeping in sync. -->
[[File:Focus stacking Tachinid fly.jpg|thumb|1000px|center|A series of images demonstrating a focus bracket. The image on the left shows a single shot taken at [[f-number|{{f/}}10]] with the features of the fly closest to the camera. The center image shows the features farthest from the camera.  The image on the right shows [[focus stacking]]: a sequence of six incrementally focused images of the fly assembled to make a composite image using [[CombineZM]].]]

Focus bracketing is useful in situations with limited [[depth of field]], such as [[macro photography]], where one may want to make a series of exposures with different positions of the [[cardinal point (optics)|focal plane]] and then choose the one in which the largest portion of the subject is in focus, or combine the in-focus portions of multiple exposures digitally ([[focus stacking]]). Usually this involves the use of software with [[unsharp masking]], a filtering algorithm that removes out-of-focus portions of each exposure. The in-focus portions are then "stacked"; combined into a single image. Focus stacking is challenging, in that the subject (as in all brackets) must stay still and that as the focal point changes, the magnification (and position) of the images change. This must then be corrected in a suitable application by transforming the image.

{{See also|Automatic focus bracketing}}