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M4/3 zooms with f5.6 apertures
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PostPosted: Tue Aug 22, 2017 1:10 am    Post subject: M4/3 zooms with f5.6 apertures Reply with quote

I was looking at buying a m4/3 zoom lens and I was wondering how well the various f3.5-5.6 ones work, given that an aperture smaller than f5.6 will result in diffusion and softening. So does this mean that these zooms at the long end, will never produce an image that is very sharp as stopping them down is going to result in diffusion softenng?


PostPosted: Tue Aug 22, 2017 1:24 am    Post subject: Reply with quote

Iirc the advanced dof calculator at Cambridgeincolour.com gives diffraction limits. I know sensor size can be specified...

Edit:

Nevermind, use this:

http://www.cambridgeincolour.com/tutorials/diffraction-photography.htm#calculator

I get diffraction limit is between f/11 & f/16


PostPosted: Tue Aug 22, 2017 2:07 am    Post subject: Reply with quote

Sadly, that calculator is useless as it doesn't allow you to specify the number of pixels in the sensor and therefore the pixel size.

This page says the diffraction limit for a 16mp m4/3 sensor (what I am using) is f7:

http://fourthirds-user.com/wiki/Diffraction_limit

I guess it's a matter of how much diffraction softens the image.


PostPosted: Tue Aug 22, 2017 2:09 am    Post subject: Reply with quote

Wow! Thanks for pointer to better calculator...