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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
tedolf
tedolf Forum Pro • Posts: 29,548
I understand the argument...
1

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

 tedolf's gear list:tedolf's gear list
Olympus PEN E-P5 Olympus M.Zuiko Digital ED 9-18mm F4.0-5.6 Olympus M.Zuiko Digital ED 40-150mm 1:4-5.6 Olympus M.Zuiko Digital 14-42mm 1:3.5-5.6 II R Samyang 7.5mm F3.5 Fisheye +9 more
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