Why are images get soft at wide aperture ?

Started 6 months ago | Discussions thread
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semi pro photographer Forum Member • Posts: 75
Why are images get soft at wide aperture ?
1

When I use the little 50mm f/1.8 at f/1.8 ~ f/2.8 the images are a bit soft at center and get softer / more blur at the corners .

But when using f/3.5 ~ f/11 the images are sharper and less blurred .

Even with 50mm f/1.4 and 85mm f/1.8 , when using wider aperture , the images become less sharper .

How can I get sharper images at wider aperture ?

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