Depth of Field Testing

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flyguy

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Have been out testing a couple of older Nikkor manual focus primes on a D780; the primes are a 28mm f/2.8 and a 50mm f/1.4. One target is a covered foot bridge with exposed beams, trusses and bolted support plates; the angle of the shots is such that it is simple to check the images for acceptable sharpness from close in to farther away, and check the background at infinity for sharpness. I understand that the smaller the aperture, the greater in focus the depth of field should be. My question is....why is that? What is the physics behind that reality?
 
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