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I'm creating an interior scene and have just added depth of field to the camera. I've used this several times in Blender with no issues, but now I'm finding that I have to use an insanely low F-Stop to see any change? I'm using a focal length of 14mm, focal distance of 118cm, and here is the shot using an F-Stop of just 0.1:

0.1 F Stop

And here is an F-Stop of 0.001:

0.001 F Stop

Here are my scene units:

Units

I'm sure the fix for this is very easy, but I haven't been able to find this exact issue online. Would appreciate any help!

Thanks.

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    $\begingroup$ The sensor size plays a role in DOF : what is it ? Its the combination of sensor size + aperture that dictates the DOF. Standard sensor size is 35mm I think. $\endgroup$ Commented Nov 13 at 17:04
  • $\begingroup$ @Lutzi Sensor size is 36mm. $\endgroup$ Commented Nov 13 at 17:14
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    $\begingroup$ Then I dont know, please upload your file with blend-exchange.com. You just need to follow the instructions. If the file is to big, make a copy of your file and remove everything you can (textures and such) while keeping the issue. $\endgroup$ Commented Nov 13 at 17:15
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    $\begingroup$ Your Unit Scale is 0.01 which means all the objects in your scene are not working with real life sizes. The dimensions of the selected object show it has a diameter of 37.5 cm... which means it is 37.5 m in real life size. I could imagine this has an influence on the F-stop. $\endgroup$ Commented Nov 13 at 17:18
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    $\begingroup$ Selecting all with A and scaling everything together down with a factor of 0.01 and applying the scale afterwards, probably with the 3D cursor at the world center as pivot point.. Or when you want your scene to use real world scales, not changing the unit scale right from the start. $\endgroup$ Commented Nov 13 at 17:29

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Problem was being caused by the Unit Scale, which was set to 0.01 instead of just 1. That means everything in the scene was being multipled to 100x it's original size, throwing off the way the camera interacts with the scene.

To fix I changed the Unit Scale to 1 (0.01 x 100), and then scaled the scene down, using the 3D Cursor as the Transform Pivot Point, by a factor of 0.01 (1 / 100). Then just select the entire scene with A and Apply All Transforms.

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    $\begingroup$ Glad I could help, it was just a guess because I'm not at a PC right now to test it. But I've tried recreating a real photo once which I took with my camera and where I knew the settings like focal length and aperture and it worked, I mean it wasn't exactly matching the real DOF but it wasn't way too far off. $\endgroup$ Commented Nov 13 at 18:55

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