These are charts depicting total DOF and the shift between the DOF in front of the focal point and the DOF in rear of the focal point. The calculations use the CoC (circle of confusion) of a DX sensor, though the trend appears similar for FX. Each chart uses a focus distance of 1 meter, the focal length listed above it and progresses thru the apertures

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Magnification is achieved by a combination of focal length and focus distance.

Took a few days to come up with the right equations to use DOF equivalent focal length & focus distance combinations. Basically started with the DOF equations for a series of focal lengths. Then determined an increase in distance that would result in the

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This comparison uses the same aperture (f/11) and same subject/view size (16.78”) with four different focal lengths.

• The red line represents the width of the subject/view.
• Positions a, b, c and d represent camera positions using the four focal lengths in the table.
• Black lines represent angle of view for each focal length.

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Thought this was an interesting shot in that the depth of field is clearly visible on the surface of the concrete. The bug's body is roughly 1/8" wide and barely fits in the depth of field.


Attachment 98536

Cropped view
Attachment 98537

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Note: This post was copied from the topic "What did you learn Today?" in Learning Photography Forum as it seemed more of a bloggy idea.

This may be common knowledge, but something my film camera provided better info than the D3200. So, continuing to deepen my grasp of the way DOF works and perhaps come up with an easier way for

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