View Single Post
  #13  
Old April 20th 18, 08:37 AM posted to sci.astro.amateur
Paul Schlyter[_3_]
external usenet poster
 
Posts: 1,344
Default Hey, hook this up to a scope!

On Wed, 18 Apr 2018 17:32:56 -0600, Chris L Peterson
wrote:
On Wed, 18 Apr 2018 08:35:12 -0700 (PDT), Quadibloc
wrote:


On Wednesday, April 18, 2018 at 9:31:00 AM UTC-6, Chris L Peterson

wrote:
although I doubt there's much you
can do with tilting the focal plane that you can't do already in
Photoshop.


Although its true that image manipulation programs can distort

images in a keystone shape, and dropping the front is equivalent to
cropping an image made with a wide-angle lens, what with the
Scheimpflug rule, tilting the back controls which elements of an
image are in focus, and that can't be done after-the-fact.

Depends on the subject, and the degree of perfection desired. That's
actually not hard to do in Photoshop, although an imaging expert

could
probably tell the difference. For a static scene, however, like a
landscape or architecture shot, you can do it by shooting a series

at
different focus positions and combining them. In fact, many cameras
can shoot a burst sequence automatically that way, with 8-10 shots

at
different focuses in just a second or so.


Taking many shots with slightly different focus and then combining
them is becoming the standard way of taking macro images of e.g.
small insects. There the change in focus is obtained by making small
movements of either the whole camera or the object. The final image
will have a dramatically increased depth of focus compared to a
traditional single-shot image.