This is a special purpose calculator which calculates the hyperfocal distance of a lens.
When the Widget is started, it displays a window with four fields.
Enter data into the white fields.
The grey field is used to display the hyperfocal distance when the RETURN
or ENTER key is pressed.
The widget uses the following simple equation:
hyperfocal distance = (f * f / (n * c)) + f,
where f is the focal length of the lens in mm,
n is the f-stop number and
c is the circle of confusion in mm.
The result is expressed in mm.
For a photographic view of hyperfocal distance see Hyperfocal Distance Explained.
For the historical and mathematical background see this Wikipedia article.
The Hyperfocal Distance Calculator is Copyright © 2019 Harry Whitfield (G6AUC).
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA