PineBomb wrote in post #19476703
Are you familiar with the term hyperfocal distance? It’s similar to zone focusing but achieves the most DoF possible.
It’s helpful to explore the formula like Kim described, but in practice I never do. Instead I estimate to a certain distance within the frame as I shoot.
Formulas? We don’t need no stinkin’ formulas.

The XF16 f/1.4 has a clutch to permit manual focus. When you enable it, a distance scale on the lens barrel is revealed that will permit hyperfocal focusing without any calculations. You set the middle of the "∞" (infinity symbol) on the lens barrel to the shooting aperture indicated on the far focus side of the scale. This basically means that your far acceptable focus is set to infinity. The distance at the corresponding aperture on the near focus side of the scale is your near focus distance - everything between this distance and infinity will be in acceptable focus. The distance on the centerline of the scale is the hyperfocal distance (the distance at which you are focusing to get everything to infinity to be in acceptable focus).
You can use the scale to set the appropriate aperture to get everything in acceptable focus for a specific near-distance or focus distance. The lens is the calculator. This is also known as scale focusing or zone focusing. AF is nice, but does not teach you how to focus and AF lenses mostly do not have these scales on them any more, regardless if they have aperture rings or not. It's a bummer.
With manual focus lenses with scales on them, you can focus without ever looking through a viewfinder, as long as you can estimate distance to the subject and the desired range of acceptable focus. Just setting the aperture to f/16 is not always the best approach, regardless of the focus distance, because then diffraction crushes image sharpness.
Kirk
EDIT - The image of the XF16 that I grabbed off of B&H's website is curious. The infinity symbol is positioned at the left end of the distance scale (for example, the numbers to the right of the infinity symbol are the distances in feet (red) and meters (white)). What is sort of strange is that the infinity symbol is shown set to the near focus side (to the right side) of the focus mark. I know that some lenses have a small extension next to the infinity symbol to indicate infinity focus for IR photography (it looks like an "L" laying on its side and the tail of the L is the IR infinity mark) but usually that mark is before infinity. Strange. Anyone with an XF16 - can you confirm that the B&H image is accurate? I don't have this lens anymore.

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