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The statement "If you go below F8 you lose focus because of the fraction" seems to be referring to the aperture setting in photography. In this context, it is true that going below (or rather above) F8 can impact focus, but not specifically due to the fractional nature of the aperture.

Here's the detailed explanation:

In photography, the aperture setting (denoted by f-numbers like F8, F2.8, etc.) controls the size of the lens opening through which light enters the camera. The f-number is a ratio of the lens's focal length to the diameter of the aperture opening. A lower f-number (e.g., F2.8) means a larger aperture, allowing more light to hit the sensor, resulting in a shallower depth of field. This can create a blurred background and a sharp subject, often leading to a more aesthetically pleasing focus on the subject.

Conversely, a higher f-number (e.g., F16) means a smaller aperture, which allows less light in but increases the depth of field, making more of the scene in focus. However, this can also lead to a phenomenon known as diffraction, where the image starts to lose sharpness because light waves are spread out as they pass through the small aperture opening.

So, if the statement is referring to going below (or above, depending on interpretation) an f-stop like F8, you could lose sharp focus due to diffraction at very high f-numbers or due to a shallow depth of field at very low f-numbers. The "fraction" part might be a misinterpretation of the fractional representation of f-numbers.

In essence:

  • True, if interpreted that going to very small apertures (high f-numbers like F22) leads to diffraction and loss of sharpness.
  • False, if interpreted that going to lower f-numbers (e.g., below F8) inherently causes loss of focus due to the fractional nature of the aperture setting.

The true impact on focus depends on the depth of field and diffraction, not the fractional aspect of f-numbers themselves.

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