Aperture does affect depth-of-field as you can see from the set of images above. The distance of the camera from the subject, and the distance of the subject from the background also impact depth-of-field.

35mm equivalentfocal length

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Depth of fieldcalculator

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If you’re like me you’ve likely heard photographers claim that you “must have” fast prime lenses if you want to create separation between the subject in your image and the background. While changing aperture does impact depth-of-field and image separation, you don’t “have to” spend money on fast primes to create this visual effect.

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The images above illustrate a couple of things. The first is how much more of the subject and background are in focus with each change in aperture. The second is how dramatically the shutter speed used was affected by changes in aperture, going from 1/2500th in the first image, down to 1/60th in the sixth image.

Let’s look at four more sample photographs. These next images were taken with the same camera, using the same lens set at the same aperture. The lighting changed slightly for one of the images, but the shutter speeds are very similar.

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Shallowdepth of field

And the last one at f/16. At a shutter speed of only 1/60th on a windy day I had to wait for a reasonably still moment to capture the image. How is potential diffraction impacted at f/16?

Given the windy conditions I did my best to try to capture the blossoms at roughly the same size in the frame. You can see how using a much longer focal length and having to move away from the subject slightly has dramatically changed the depth-of-field in the image. There is still a vertical fence board visible in the upper left corner but it is much softer and muted.

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Depth of fieldsimulator

Using this approach is also a reason why I love using lenses like the 1 Nikon 10-100 mm f/4-5.6 zoom lens. It has a comparatively short minimum focusing distance which helps to make it easier to create image separation and shallow depth-of-field.

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Depth of field

Personally, I would much rather change the focal length I’m using and adjust the distance from my camera to the subject, and the subject to the background to create separation in images. I feel this approach gives me more flexibility since I don’t have to adjust my exposure at all.

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Now, the same two blossoms captured at the same aperture, with the same lens, but this time at a focal length of 100 mm.

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First let’s consider how changing aperture affects depth-of-field and image separation. We’ll have a look at a series of images taken with a Nikon 1 J5 and the 1 Nikon 32 mm f/1.2 prime lens at increasingly smaller apertures.

Focal length

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Would be interesting to compare out of focus blur, taken with 32mm and zoom 10-100mm at 32mm with same aperture f:5,6. Is there a difference?

As photographers we spend time considering how we want to compose an image. We often think about balance, leading lines, ‘rule of thirds’ and depth-of-field. Typically we associate aperture settings with depth-of-field. One of the factors we sometimes overlook is how lens focal length and depth-of-field are related.

Hi Stanislaw, Yes, there are all kinds of possible lens comparisons that could be done! I almost never shoot still images with any of my 1 Nikon prime lenses as I much prefer using zoom lenses for still. I think the images for this article are the first still images I’ve shot with the 32mm in almost a year. My three 1 Nikon primes are my ‘go to’ lenses for client video work. Tom

In the image above you can clearly see that at a focal length of 10 mm not only are the two blooms in focus, but much of the background is easily discernible and is distracting.

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At f/2.8 I was able to get enough of the flower in focus for an acceptable image. As you look through the series notice how much of the flower and the background are in focus.

These last four images demonstrate how using longer telephoto focal lengths can dramatically compress depth-of-field, and how using wider focal lengths give us increased depth-of-field.

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