It is crazy but the truth is... I'm easily amused.
I was using my 90 mm tilt/shift lens to gain as much advantage as I could in terms of maximizing dof but it was not enough for this particular set of parameters. The closer the camera is to the subject/object the less the dof - that is the most powerful variable in the equation specific to this instance. I needed about 8 full inches of dof with the camera about 24 inches from the blade. Coop - would you confirm that even with powerful strobes and f22 aperture it's not possible to get that much dof with our typical configurations? If there's another way to create that much dof, I'd sure like to know.
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Avatar ~ custom crank case cover from 1969 Harley shovelhead chopper
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