To achieve an image where everything is in focus, you would need to use a smaller aperture which would give you a larger depth of field.
For the second image, you would use a bigger aperture which would give you a smaller depth of field – hence the nearest thing being of high focus.
Small F number = big aperture = small depth of field
Small aperture = big F number = larger depth of field
With the same aperture – Further away you focus – the depth of field will grow
I took these on an iPhone on portrait mode however struggled to notice much of a difference than I would do on a camera. I would say the first image is the best out of the three as you can clearly see the picture focus on the rabbit’s eye.
The other two lose focus of the image on a whole as in the third, you can see parts of the background in focus as well as the rabbit. The second image isn’t as focused on the centre of the image (rabbit) but instead, lower down which doesn’t look as effective as the first.
As the F number rises, this affects both the aperture and also the shutter speed. The shutter speed is how much light is being let into the image. This also affects the duration you are having to hold the camera for e.g. If the F number is lower, you may have to hold the camera for 1-5 seconds which can be quite difficult as naturally, our hands move/shake when trying to remain still.
Ideally, you would like the picture to be taken in less than half a second to achieve quality and focus of the overall image. This obviously only when using a professional camera rather than a phone.
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