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OMD: Can I take the same pictures with the 12mm f2.0 and the 17mm f1.8 ?

Started Nov 27, 2012 | Discussions thread
Laszlo13
Laszlo13 Contributing Member • Posts: 914
Re: I understand the argument...

tedolf wrote:

richarddd wrote:

tedolf wrote:


that I have read on this board others suggesting that if you take that cropped image and blow it back up to 8 x10" through some sort of majic the DOF changes as well.

I don't believe it but some here do.

Tedolph

The argument is that DOF is measured by circle of confusion. When you blow your picture up to 8x10, magically all the small circles of confusion become larger circles confusion, which mean a change in DOF.

I just don't buy it based on my experience using film slide projectors with zoom lenses.

Zooming the picture on the screen did not suddenly make things jump into and out of focus!

Tedolph

Ha - interesting.  I seem to recall threads around this.  Anyway, if it was true, than wouldn't the converse would have to be true?  Shrinking the image down would expand the DOF, and in theory image that are shrunk to microscopic levels would start to have infite depth of field, despite being shot with something like a 50mm 1.4

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