DOF and f-stop "equivalency" between APS-C and FF and ...

[scott kirkpatrick]

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Mike Johnston guides an extended tour of the rabbit hole down which one plunges when trying to compare lenses intended to cover different image sizes, at TOP: http://theonlinephotographer.typepad.com/the_online_photographer/2018/08/readers-weigh-in-on-the-olympus-25mm-%C6%9212-and-the-pentax-hd-fa-50mm-f14-sdm-aw.html     It's complete with links to unwilling, grumpy family members shot at f/1.2 with the corners of their eyes in focus, but all else OOF, but other examples are relevant.  Maybe we can just link to this instead of devoting column-yards to the subject here.

 

It's all his fault for inventing the word "bokeh" or at least bringing it into use in English.  

Edited August 5, 2018 by scott kirkpatrick

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[jaapv]

Let's summarize that rather lengthy blogpost:

 

 

So when you say "ƒ/1.2 on Micro 4/3 is equivalent to ƒ/2.4 on FF," what you really mean is that ƒ/1.2 on Micro 4/3 has roughly similar apparent d-o-f wide open to a picture taken at ƒ/2.4 on FF, if the camera position and setup are the same, the lens's angle-of-view is the same, the lens designs are the same, the system resolution is the same, the degree of enlargement is the same, and the viewer's aesthetic standards for acceptable blur are the same...

[jmahto]

Let's summarize that rather lengthy blogpost:

Didn't say anything about subject being same in that (otherwise great) summary!

Edited August 10, 2018 by jmahto