Samsung 45mm f/1.8 Review (2d)

Started Apr 26, 2013 | Discussions thread
viking79
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Re: Samsung 45mm f/1.8 Review (2d)
In reply to Timmbits, May 9, 2013

Timmbits wrote:

Timmbits wrote:

what is the "mean" in the MTF chart please?  pardon my ignorance.

Where you show on the same chart: horizontal, vertical, and mean. the mean is the shortest bar, and I would have thought it to be an average... or does it refer to a mean deviation?

Sure, it is the numeric average between the horizontal and vertical numbers, and presented in reference to the vertical axis, or "page height".  Some lenses or sensors are much sharper on one axis (vertical or horizontal) either from what is known as astigmatism or from an anti-alias filter that is asymmetric.  I use mean as it is more specific than just saying "average", it really doesn't matter though, that's what it is

Eric

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