Re: Building 30" Drum Scope
- From: Chris L Peterson <clp@xxxxxxxxxxxxxxxxxx>
- Date: Sat, 30 May 2009 07:39:43 -0600
On Sat, 30 May 2009 01:41:22 -0700 (PDT), Hayden
<haydenfleming@xxxxxxxxx> wrote:
I can't believe why you mention that without an objective,
the focal plane is at infinity.
You are confusing a pinhole imaging system with an aperture producing a
diffraction pattern. They are completely different things. When you are
simply producing a diffraction pattern, the aperture is illuminated with
a plane wave and there is no image. If you have a complex wave front,
you can consider an aperture to be a pinhole lens, with an image formed
geometrically at infinity, although you don't have to go that far to
reach the resolution limit created by diffraction.
_________________________________________________
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
.
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