Train to nowhere

by Jorge Córdoba

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As mentioned in the other answers, diffraction has led to unsharpness. To put this to the test, one can attempt to sharpen the image using deconvolution by using the point spread function that corresponds to F/29. For diffraction, we have (up to an overall normalization) P(s) = {J1[ πrs/(λF) ] / [ πrs/(λF) ] }2 where J1 is the Bessel function of the ...


You've run over the diffraction limit. Light rays passing through a small hole will diverge and interfere with each other and a pattern emerges--a sort of banding where different frequencies/placement can cause separate rays to add up or negate each other. The smaller the opening gets, the larger this divergence/interference becomes. This pattern is called ...


Because of diffraction. f/29 is way too much for you to expect a sharp image. Try shooting the same thing at f/8 and you'll see the difference.


You can use a camera or lens that offers tilt capability. The zone of sharp focus doesn't get any wider, but it tilts. Example: the bottom of the frame is focused a foot away, the top of the frame is focused slightly past infinity. If that matches the way your scene is laid out it can appear you have insanely deep DoF even though the DoF at any given point ...

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