hyperfocal question

[jvanark]

<p>When looking at a chart or software to determine hyperfocal distance and the focal length of the lens is asked for is the the "real" focal distance of the lens used or should the crop factor of the camera body in use be taken into account?</p>

 

[SCL]

<p>Real - a crop doesn't change the world of physics. The focal length of the lens is the focal length of the lens. Just because a crop sensor only covers part of the area, the hyperfocal distance isn't affected.</p>

[James G. Dainis]

<p>You can check it out with this depth of field calculator:<br>

http://www.dofmaster.com/dofjs.html<br>

The format used does affect the hyperfocal distance. Smaller formats need a smaller circle of confusion for a given enlargement. If the chart is based on a given circle of confusion size, the greater enlargment needed from a smaller format will result in loss of acceptable focus at the near limit.</p>

[bill_clark___minnetonka_mi]

<p>Perhaps this will help:</p>

<p>http://en.wikipedia.org/wiki/Circle_of_confusion</p>

<p>It's rather confusing to me! (Just kidding!)</p>

<p>Hope this helps!</p>

[jvanark]

<p>Thanks for all the responses. Gonna work through the information and practice.</p>

<p>-- jon</p>