As shown in the picture, when you use a telephoto lens and place it close to the ground for shooting, the depth of field you obtain is incorrect. The camera focuses on the object, which remains clear, while its reflection is very blurry. In the path tracing mode, there is a switch called “Reference Depth of Field” that can avoid this situation, but it is not available in other modes. I hope to find a solution to this.
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In the material with the reflection, try toggling After / Before DOF.
but it’s a material without translusency（100%metallic,reflection only）,After / Before DOF Options are not available
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Sorry, hard to tell… 
I can’t find anything relevant, sorry… 