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Canon EOS 4000D and EF 50mm 1.8STM

Started 7 months ago | Questions thread
stevet1 Senior Member • Posts: 1,300
Re: Canon EOS 4000D and EF 50mm 1.8STM

DarkoR wrote:

Hello,

I have Canon EOS 4000D and EF 50mm 1.8STM.
I noticed that pictures taken with f/1.8 to f/2.8 are out of focus when I'm focusing on focus dots with auto focus.
When I'm focusing with live preview focus is OK at whole range of f.
I found that my camera have 9 AF points (f/5.6 cross type at centre).
Does it means when I'm using f less than f/5.6 I will have issue with auto focus?

DarkoR,

I have read that those wide aperture lenses are not at their best when wide open at 1.8 or 2.8, but I saw a picture the other day that was taken at 1.2 that was pretty good.

The thing is that at those wide open apertures, your depth of field is going to be pretty small. The specific thing you are focusing on will probably be in focus, but everything else will look blurry. The depth of field can be so small that one eye in a person's face will be focus, and the other eye won't be.

Steve Thomas

 stevet1's gear list:stevet1's gear list
Canon EOS Rebel T8i (EOS 850D) Canon EF-S 55-250mm f/4-5.6 IS STM Canon EF 50mm F1.8 STM Canon EF-S 18-135mm F3.5-5.6 IS USM
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