1Dx Review

Started Jul 11, 2012 | Discussions thread
facedodge Regular Member • Posts: 309
Re: every one of you is wrong! :)

tko wrote:

Jeez, it's like the wise men describing the elephant. I guess technically, you each got one part right - while ignoring everything else.

The simplest, easiest way to understand DOF is that it's dominated by subject magnification (squared) - the ratio of real subject size to the virtual image size projected on the sensor. It's that simple. After that, it's proportional to F-stop.

If you keep the same framing, the magnification changes as the sensor size changes. If you change the FL the magnification changes. If you change the distance the magnification changes. If the subject gets larger with the same framing, the magnification changes. All these factors impact magnification, but individually confusing. Magnification is the root cause that explain everything.

A macro has limited DOF because of the magnification. Even at F22. A fisheye has unlimited DOF because of the (lack of) magnification. Even at F4.0

Use this rule and you'll never be wrong.

What he said....

 facedodge's gear list:facedodge's gear list
Canon EOS 5D Mark III Canon EF 35mm F1.4L USM Canon EF 50mm f/1.2L USM Canon EF 135mm F2L USM Tamron SP AF 90mm F/2.8 Di Macro +4 more
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