Everything I just said was about macroscopic electromagnetic waves. Photons, on the other hand, are not macroscopic waves, they are quantum particles. They are not described by Maxwell's equations. But they do have polarization and thus the same answer applies to them.

S-polarization vs p-polarization

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Can it therefore be assumed, then, that if light is linearly polarized, it is in phase? More specifically, if two photons, separate from each other, are linearly polarized, are they in phase with each other?

Two different waves are independent of each other. This means that their directions of travel can be different, their frequency (and therefore wavelength) can be different, the orientation of their polarization can be different, and so can their phase.

Elliptical polarization

Another factor in depth of field is your choice of lens. Different lenses have different depth of field characteristics, which is caused by the magnification of the lens. The greater the magnification (as with telephoto lenses), the shallower the depth of field, and vice versa.

If you’re shooting in Auto mode, your camera will decide the ‘best’ aperture for you. If you’re shooting in Aperture Priority mode, you can simply set the aperture by using your camera’s control dial and your camera will automatically determine the shutter speed.

Linearly polarized electromagnetic wave

Linearpolarization example

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There are three different factors that influence depth of field — aperture, distance from your subject and magnification. First, let’s look at how to change your depth of field using different aperture settings.

This means that if you’re shooting at f4 using a 24mm focal length 10m from your subject, you will have much greater depth of field than if you were shooting f4 using a 200mm focal length at a distance of 10m.

Linearly polarized light

Linear polarisationmeaning

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Linearly polarized light is linearly polarized because the x and y components of the electric field are in phase with each other. All this means is that the the x and y components both have the same factor of $\cos(kz-\omega t+\phi)$. For light that is circularly polarized, they have different $\phi$s that differ by $90^\circ$.

Depth of field and distance are also two inseparable elements. The closer you are to the subject that you want to shoot, the shallower the depth of field will ...

The larger the aperture, the more light is recorded and the shallower the depth of field. With smaller apertures, less light is recorded and the depth of field is greater. Aperture is recorded in f-stops and is shown by the symbol ‘f'.

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As we discussed in Chapter 1, aperture refers to the opening through which light passes before hitting your camera’s sensor. By controlling the size of that opening, we can control how much light is recorded in an image as well as the depth of field.

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Linear polarisationformula

An aperture of f22 was used for the image above. You can see how the depth of field runs much further, keeping both model and the background in sharp focus. (See how Karl captured this image here).

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Circular polarization

Magnification can refer to the sensor size, focal length and distance from the subject. For example, a larger sensor size, longer focal length or closer focusing distance will result in shallower depth of field. At the same aperture, full-frame cameras will have a shallower depth of field compared to crop-sensor cameras. Again, at the same aperture, medium-format cameras will have an even shallower depth of field than full frame cameras.

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DoF is also dependent on the distance from your subject. The closer you are to the subject, the shallower your depth of field will be. Shooting from further away will give a much greater depth of field. This is due to magnification.

If you’re shooting in Manual mode, you have the greatest level of creative control, but you have to balance your aperture and shutter speed to get the best exposure. In any of these modes, you can simply adjust your aperture using either the front or back control wheel of your camera.