what is the diffraction limit of the Leica 25mm f / 1.4?

Started 3 months ago | Questions thread
mostlyboringphotog Veteran Member • Posts: 9,651
Re: what is the diffraction limit of the Leica 25mm f / 1.4?

El Jeffe wrote:

Possessing a 4th grade math level I can not understand or answer your question, but generally, by what I read, f/5.6 seems to be the sweet spot for m4/3 prime lenses.

I am curious why you ask this question. Are you looking for a good landscape lens?

Consider m4/3 has an advantage over larger sensors for increased depth of field. So f/5.6 might for instance perform similar to f/11 on a full frame in that regard.

DOF effect due to the aperture is the same regardless of the sensor size.

f/2 on 4/3rd or FF will have the exactly the same CoC size on the sensor.

However, for the same FOV, 4/3rd sensor uses 1/2 the FL of FF sensor, this has the effect of reducing the size of CoC by 1/4, which increases the DOF by 4x.

Since the 4/3rd image is enlarged by 2x (relative to FF - ignoring the aspect ratio), the DOF increase is now only 2x, which can be equalized by increasing the f/stop by 2 stops for the 4/3rd sensor.

Obviously, the above has nothing to do with diffraction.

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