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08-01-2015, 05:25 PM   #31
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QuoteOriginally posted by GUB Quote
A question here - (not an argument) are the OOF areas equally identical , ie is the potential for bokeh the same?
At equivalently chosen parameters yes, with sufficiently abberation-free lenses.
There really is now way to tell the difference.

It isn't just the depth of field is the same, the bokeh (i.e., rendering of out of focus point light sources into defocus disks) is the same too. Of course, real lenses don't always render perfect disks which leads to differences in the bokeh. But these differences don't exist for ideal lenses.

The fastest way to understand the reason why this is and avoiding any math: Bokeh is a parallax effect, the left edge of the lens seeing from a slightly different perspective than the right edge of the lens. And this effect depends on the distance between the two edges (and distance to the subject) and nothing else (especially not sensor size). This edge distance remains a constant if the aperture diameter is kept a constant, i.e., if fstop is scaled with 1/crop factor (because this is what you scale the focal length with).


Last edited by falconeye; 08-01-2015 at 05:44 PM.
08-01-2015, 05:29 PM   #32
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QuoteOriginally posted by UncleVanya Quote
The canon links I shared seemed like it.
Thanks for that.

---------- Post added 08-02-15 at 12:30 PM ----------

QuoteOriginally posted by falconeye Quote
At equivalently chosen parameters yes, with sufficiently abberation-free lenses.
There really is now way to tell the difference.

It isn't just the depth of field is the same, the bokeh (i.e., rendering of out of focus point light sources into defocus disks) is the same too. Of course, real lenses don't always render perfect disks which leads to differences in the bokeh. But these differences don't exist for ideal lenses.
Thanks
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