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Let's say I have an Image plane and a Camera looking at the plane from some angle (large or small).  I want the middle part of the viewport of the camera to be in focus, the rest should be blurred, but the part of the image face away from the camera should be the most blurred. 

enter image description here

enter image description here

Source: https://www.youtube.com/watch?v=N9RzuCWdBDY

I have tried with Empty as Focal point at the Image plane but the F-Stop makes it ether all blurry or too sharp for the sides of the viewport. I also tried moving the focal point very far, but this has an effect only if there are actual 3D elements in front, the Image plane isn't affected. What I imagine: enter image description here At angle in perspective. enter image description here I will appreciate your suggestions. I'm looking to repeat the solution for other projects, so I hope what I need as camera blur is easy to achieve.

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  • $\begingroup$ "but the part of the image face away from the camera should be the most blurred." - what are you talking about? Actually the whole question is unclear. You should edit it and describe what you want to do, maybe show an example of desired result. $\endgroup$
    – Martynas Žiemys
    Commented Aug 8, 2023 at 12:58
  • $\begingroup$ Are you just asking how to render depth of field, or is there more to this question? What exactly do you want to do with the plane? $\endgroup$
    – Martynas Žiemys
    Commented Aug 8, 2023 at 13:05
  • $\begingroup$ Thanks for the reply @MartynasŽiemys like this After effects tutorial: youtube.com/watch?v=N9RzuCWdBDY in perspective, closer it is the plane as angle to the camera the sharper the image is. Also the sides are out of focus. $\endgroup$
    – Dark GT
    Commented Aug 8, 2023 at 13:06

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If you don't mind using the Compositor, you can use a Defocus Node when you enable the Z Pass in the View Layer Properties: enter image description here

For more control over the blur shape, you can also use the Defocus Node with a (blurred) Box Mask instead of the actual Z Pass, but this is only a 2D effect:

enter image description here

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    $\begingroup$ Great answer. I did tried the Defocus node, but I guess I was following the wrong tutorial. Only left to feather out the Mask edges. Trying it with "Double Edge Mask". $\endgroup$
    – Dark GT
    Commented Aug 8, 2023 at 13:36

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