Sigma DP2M: Aperture Sharpness & Diffraction

Started Oct 24, 2012 | Questions thread
lensez Forum Member • Posts: 99
Re: Sigma DP2M: Aperture Sharpness & Diffraction

Kendall Helmstetter Gelner wrote:

stoavio wrote:

Hi all,

Can anyone give some insight into the sharpness of various f stops. I tend to shoot pretty wide simply because I want to gather as much light as I can while keeping the ISO as low as possible but I am contemplating some longer exposure shots and plan on doing some landscape photography.

Can I shoot at f/16 without worrying about diffraction? I know the quality of this lens is highly touted but I just need to know what the limitations are so I can be mindful of them. What do you guys think the absolute sharpest apertures are?


Anything past f/11 is where diffraction starts to become noticeable. I think it has some small effect past f/8.

This confirms that anything past f/11 is where diffraction starts to become noticeable:

Scroll down to the "Diffrfaction Limit Calculator" and select CF 1.5X and "calculate."

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Gary K

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