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photo:focus_stacking

focus stacking for greater depth of field

introduction

  • macrophotography of 3D subjects is problematic as the depth of field (DOF) is rarely deep enough to cover the whole subject, even when the aperture is stopped down to f/11-f/16
  • capturing a subject 1cm in length from head to tail in perfect focus is a feat that all insect photographers wish to accomplish but when shooting at 1:1 macro, depth of field may only be 0.5mm
  • stopping the aperture down too much looses image detail due to diffraction issues
  • an option to address this issue is to take a series of photos with slightly different focus points then in post-processing with Photoshop or similar, combine these images and only display the in focus areas from each - this is called focus stacking
  • now this is very tedious for most of use mere mortals so in 2015, Olympus kindly automated this procedure in-camera for their latest OM-D cameras as well as their Stylus TG-3 and TG-4 Tough cameras by including automatic focus bracketing and taking this a step further to automate the post-processing of these images in camera as "focus stacking" mode
  • it can also be used in landscapes with very close foregrounds!

www.ayton.id.au_gary_photo_images_depth_of_field_-_single_exposure_vs._focus_bracketing-1.jpg

www.ayton.id.au_gary_photo_images_focus_bracketing_stacking-1.jpg

The above images were supplied to me for publishing here by Olympus photographer Kim Holst who created these nice explanatory diagrams

examples

photo/focus_stacking.txt · Last modified: 2017/10/31 12:24 by gary1