Started Aug 8, 2012 | Discussions thread
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OP xenon-mkd Regular Member • Posts: 124
Re: When I woke this morning I promised myself that nothing

As for the people suspecting real problems, download some Dept of field (DOF) calculator programs or google for some sites that offer the service online, input your parameters:

  • focal length of the lens

  • aperture number

  • sensor type

  • distance to target

to see how much dept of field you have to play with (area in which to expect the focal plane to produce in-focus image)

On a Canon 85mm 1.2 lens for example, wide-open the DOF can sometimes be 3-5mm (thats around 1/10th to 1/6th of an inch!), and by doing portrait work at close distance, focusing on one eye can show the other eye completely out of focus.

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