Luminous Landscape Forum

Equipment & Techniques => Cameras, Lenses and Shooting gear => Topic started by: FrankG on April 24, 2012, 12:42:35 pm

Title: Diffraction & lens sharpness
Post by: FrankG on April 24, 2012, 12:42:35 pm

At what point does diffraction kick in and ruin a lens' sharpness?
And, how can I test to establish that aperture?

I bought a NEX-5N (with 18-55mmm kit lens) as a pocketable camera for when I dont want to lug my 5D and although the results are pretty good I find that for shots where I needed DOF and I stopped down to f16 and beyond, the results are inferior to when I shot at 5.6 or f8

Thanks for advice, links etc

Title: Re: Diffraction & lens sharpness
Post by: ErikKaffehr on April 24, 2012, 01:50:01 pm

Hi,

Hi, left column in my article shows diffraction:  http://echophoto.dnsalias.net/ekr/index.php/photoarticles/49-dof-in-digital-pictures?start=1

Diffraction is there all the time but starts to dominate over other problems at f/5.6 or f/8.

But keep in mind that diffraction is benign to sharpening: http://echophoto.dnsalias.net/ekr/index.php/photoarticles/49-dof-in-digital-pictures?start=2

Best regards
Erik

Quote from: FrankG on April 24, 2012, 12:42:35 pm

At what point does diffraction kick in and ruin a lens' sharpness?
And, how can I test to establish that aperture?

I bought a NEX-5N (with 18-55mmm kit lens) as a pocketable camera for when I dont want to lug my 5D and although the results are pretty good I find that for shots where I needed DOF and I stopped down to f16 and beyond, the results are inferior to when I shot at 5.6 or f8

Thanks for advice, links etc