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Depth of Field (DoF) is the distance between the nearest and farthest objects in a scene that appear acceptably sharp when using a lens based camera, although the term is commonly used to simply refer to the presence of unfocused areas.

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Can I model a double convex lens

You can create something like the following. You can also adjust the IOR to your liking; this is just a sample at 1.2. Result with Shady Puck in the background: Mesh sideview profile: Modeling …
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