If not, what is?
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Dec. 30, 2023
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Why do you think it might not be?
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Because there are technical references that say that the pixel count is not a measure of resolution, yet many photographers quote MP as the measure of resolution.
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It is correct for the sensor, although the sensor itself also has some variability in effective fill factor, like the very low effective fill factor in your SD9, and the very high effective fill factor, greater than 100%, with strong AA filters.
The analog resolution of the lens is something separate from the sensor resolution.
A high-resolution sensor with a low-resolution lens may seem comically soft at the pixel level, but the potential to correct geometric distortions and aberrations is higher when oversampling the optics, and you don't miss anything the lens has to offer.
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For the native base sensor which each pixel counts photons - yes it should be in a one to one relationship with resolution. However, when one decides they want color, then the pixel count is no longer in a one to one relationship with spatial frequency resolution. CFA's be they XTrans or Bayer reduce the native resolution of the underlying sensor through the interpolation required to turn the raw data into a color image. So for a monochrome camera like the Leica M11 mono or the Q2M, pixel count is a good inceptor of the resolution. With a color camera - then not so much.
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20 MP at left: 3.4 MP at right, same lens, raw exports:
One would think that the 20 MP would have up to 5.9X more "resolution" but not even double, apparently ...
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Yep, but only with same aspect ratio ...
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One might.
Please post the question to your satisfaction and I will consider editing the thread title.
Thank you. Fortunately, I did know that.
My personal metric preference is line-pairs per millimeter for a given value of Modulation Transfer Function as shown in the above illustration. MTF50 is popular.
On the other hand MTF9 is indicative of maximum resolution a la Rayleigh except if it is above Nyquist.
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Incorrect: Norman Koren thinks otherwise:
www.normankoren.com/Tutorials/MTF2.html#sinc
Again, please re-phrase the title question to your satisfaction and I will consider editing it.
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Good. Saves me the trouble of having to quote many other references to sensor MTF.
Ouch!
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Well, that settles it. After all, what would the founder of Imatest know about anything ... 😐
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Very clever. I will not bother with a tit-for-tat ...
... come back, Danno, all is forgiven.
