X100 F4.0 sharper than F8.0?

Started May 22, 2011 | Discussions
whlcalifornia
New MemberPosts: 18
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X100 F4.0 sharper than F8.0?
May 22, 2011

Maybe it's my user error but I find F4 renders a sharper image than F8, which is a little counter-intuitive, unless F8 is the diffraction limit for X100.
Anyone else out there feel the same way about their X100?

millsart
Senior MemberPosts: 2,771
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Depends on the scene
In reply to whlcalifornia, May 22, 2011

Sometimes shooting with a shallower DOF gives an image more apparent sharpness than where more is in focus

I do believe f4 is the peak sharpness of the lens, but I've never found F8 lacking at all. Diffraction probably sets in pretty strong by F16 given sensor size

I wouldn't hesitate using F8 for landscapes etc though. I'd rather have the DOF that every last line/mm resolution at f4 and not have everythign I want in focus
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lnbolch
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Re: Depends on the scene
In reply to millsart, May 22, 2011

If you would check out a bunch of lens tests—here or on Photozone.de—you will see that the sweet spot for most lenses in the f/1.8-2.0 range tends to be around f/4.0-5.6 and down just a tad by f/8.0. Your mileage may vary a bit from lens to lens.

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whlcalifornia
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Re: Depends on the scene
In reply to lnbolch, May 22, 2011

Thank you, millsart and lnbolch. Your replies perfectly explained what I'm seeing in my X100. Its sweet spot is indeed F4~F5.6. F8 is only slightly worse but still very good.

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rami
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Re: X100 F4.0 sharper than F8.0?
In reply to whlcalifornia, May 22, 2011

Also you should expect more motion blur at F8 as the shutter opens for longer

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