how do i fix dof making the edges on my sims and other objects blurry? i'm not sure how to explain this, but they almost look doubled? like it's out of focus
*not sure how to insert pictures here, otherwise i would*
If I'm right about what's happening (I would need screenshots to be certain - you can always message them to me instead of sending an ask) it's likely a focusing issue. If the focus point isn't quite right then where the blur starts can be too close to the subject of your picture, which can distort the edges.
The easiest way to use DoF is to use mouse-driven auto-focus (there are a few people for whom this isn't a good option - specifically if you use SRWE for hotsampling, but if that isn't you don't worry). So enable that if you're not already using it.
Then, with your subject in focus (wherever you point your mouse will be where the focus sits), go and look at the far blur and near blur sections. Depending on which DoF you're using they might be called slightly different things.
[Note: if you're using Cinematic DoF I'll add different instructions at the end because it uses a different system]
You're probably only going to need to adjust far blur - that controls how quickly blur begins behind your subject, and as a result how quickly it gets to its most blurry. Try increasing that number. That will push it back so the blur begins further away from your subject.
In terms of what numbers to put in there, try to visualise the distance between you (the camera) and the horizon (the sky in the distance). Everything in between is at a set distance. Most types of DoF calculate this from 0 (at the camera) to 1000 (at the horizon). Knowing this is most useful if you're using manual focus rather than auto-focus (because you have to set the distance at which everything will be in focus yourself) but it also helps give you an idea of scale for setting the numbers for far blur too.
Remember, the higher the number you choose, the further back the blur will start to kick in, which makes the blur weaker overall, so you might need to also adjust the blur strength if you want to keep the same level of blur.
Cinematic DoF uses Aperture and Focal Length instead of far and near blur distances. It mimics how a real camera calculates focus. In general, a high aperture and low focal length will give the greatest area of focus/weakest dof, and a low aperture and high focal length will give the smallest area of focus/strongest dof. So play around with both of those, either together or independently, to get what you need.