Archived posting to the Leica Users Group, 2008/11/25
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]As Henning has pointed out this technique has advantages that simply stopping down does not always offer. Also remember that people other than photographers use Photoshop. Here at work we use Zeiss Extended Focus http://tinyurl.com/65om5t to make extended depth of field (DoF) images from microscopy. Microscopes do not have apertures so you can't stop down and at high magnification DoF is very shallow. Extended Focus controls the motorised column on our Zeiss microscopes, takes a series of images and combines them, including compensating for shifts in the image stack caused by the different perspective when using a stereo (dissecting) microscope. Other advantages of using stacked images include improved management of diffraction (which often degrades macro or micro photos) and smoother tonal transitions because of the larger number of pixels used to generate the final image, but the main one os total control of depth-of field, which you don't get when stopping down because you can generally only control it within optically defined limits. Marty Gallery: http://gallery.leica-users.org/v/freakscene -- Be Yourself @ mail.com! Choose From 200+ Email Addresses Get a Free Account at www.mail.com