Quote from: Walter Schulz on February 07, 2014, 01:13:09 PMYes you have right for 2Mpixel, but if you need 18Mpixel image, extracting frames from video is not a solution.
http://en.wikipedia.org/wiki/Focus_stacking
You may use video to collect frames with different focus distance by pushing/pulling focus. Those frames can be extracted and stacked.
However, standard for focus stacking is taking stills.