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focus distance, aperture and zoom
I’ve read through a couple of tutorials on zoom and focus distance, but i’d like to know precisely the distance where the foreground becomes blurry and the background becomes blurry.
If i allow the focus distance to be the same as the zoom distance, at a certain aperture, how do i calculate the distance where the foreground is relatively blurred?
If i place an image at a distance that is the dot product of the vector from the camera to the image and the unit vector of the axis from where the camera is pointing, is that the distance where the image is sharpest?
Also i’m more familiar with f stops. Is there a way to use f-stops instead of aperture in pixels, in the comp camera options?
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3 Replies
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You might also want to check the Expressions COW. Somebody there might have messed with cameras numerically.
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if you look at another view so you can see the camera you can see a line across the triangle that describes the angle of view is the focus distance. Drag the slider in the TLW to make adjustments visually.
To calculate the distance where the items start to go out of focus you can use just about any depth of field calculator on the web. You’ll have to do some calculations to convert pixels to feet.
An easier way would be to set up a layer with a grid, place it at an angle to the camera and count the divisions that are sharp enough for you.
DOF calculator:
https://www.dofmaster.com/dofjs.html
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hey thanks! That’s a great tip.
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