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But don't read the article, it is wrong. Compare mm to mm images. The mm image has much smaller circle of confusion than that of mm. Can you see this? Look at any decent camera, there are markings on a body like crossed out circles. The longer line marks location of the focal plane of the camera. The focal plane is an imaginary plane has 0 depth , drawn through the lens focus perpendicular to the axis of a lens. You can't talk about DoF like it's the same as the focal plane.
Alex, when I say Plane of Focus I am simply referring to an invisible plane that includes what is in focus. Depth of Field is by definition the distance between the Plane of Focus or the distance between the things that are in focus in that shot. Using them interchangeably is like using Meanline and X-Heigh interchangeably in graphic design - one is the thing the other is the distance to the thing but we'd understand the basic same function of them.
Consider also that when teaching Depth of Field you are teaching usually to someone that is very new to Photography, so I try to keep things and explain things in ways that are simpler to grasp initially. Lance, that is exactly my issue here. This is just wrong way to teach such important concepts like DoF, especially to beginners.
When beginners get confused by misconceptions like "cropfactor influencing DoF", "magnification influencing DoF", "DoF is a plane but with depth", "manipulation of objects in the frame could affect DoF" this assumed in you article etc. I strongly believe, it's one of the reasons of why there are so many people taking snapshots and sorry pretending they are art makers. Fuzzy concepts create fuzzy images where even creator can't explain what are they about. Once you know what is going on with aperture, rest will be easy, obvious and clear of misconceptions.
Do you guys know what is the circle of confusion? It's a bunch of photographers sitting at a round table and discussing DoF! I agree that the essential step is understanding why aperture affects DoF - agree with you there, but I would also say its important to know that its not the only thing and the distance is a component. Its why my students are able to create shallow depth of field shots with their kit lenses at 5. DoF is affected by aperture, distance to an object you are focusing on, lens aberrations and resolution plus the output resolution billboard, gallery print, 6x4, web etc.
The first two are related to the way lenses work and effect real DoF. Rest of them control perceived DoF. What you describe above is perceived DoF.
You can't change actual DoF of a 5. Nobody should mix actual DoF with DoF perception in a final print. This is one of major misconceptions. Few more are in my post above. You can add to the list the idea that you can compensate DoF and focal length differences by getting closer to the subject. Ah, almost forgot. The hyperfocal distance. Who can explain what is going here? It's simple if you understand that the aperture controls the circle of confusion and that smaller object gets in a projection, sharper it LOOKS for a given focal length.
Look at the magnification formula I showed before. Shorter the focal length and further the object is, smaller it is in the projection. So for a wide angle lens, magnifications drops with distance faster than for a telephoto. When you focus at a distance when further "edge" of DoF has relatively similar circle of confusion as the objects at that distance you see all of them as equally sharp. Hence the hyperfocal focusing effect.
This is again, perceived DoF not actual. Your style of photography will help inform the range you need. Not every style of photography needs the widest possible range of apertures. For everyday photography do you see much difference between F1.
Is it worth the extra expense for the extra F0. Your email address will not be published. Notify me of follow-up comments by email. Notify me of new posts by email. Our mission at BorrowLenses is to advance photographic and cinematic dreams by providing access to superior, cutting-edge gear and expert advice. Ready to get to work?
Order from your desk, have gear delivered to your door, and take on your next project. What is Aperture? What is F-Stop? An f-stop is a measurement of the aperture opening based off of the size and type of your lens. How Do You Read an F-stop? Alexandria Huff's photography and lighting tutorials can be found on px and her blog. Learn more. Why does aperture size affect depth of field in photography? Ask Question. Asked 7 years, 11 months ago. Active 2 years, 6 months ago.
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Improve this answer. Fips Fips 2 2 silver badges 6 6 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. DOF is determined by three factors — aperture size, distance from the lens, and the focal length of the lens.
The aperture is the opening at the rear of the lens that determines how much light travels through the lens and falls on the image sensor. Manipulating the aperture is the easiest and most often utilized means to adjust Depth of Field. You may have seen this principle demonstrated when you look at photos taken outside during the brightest time of the day.
The aperture range identifies the widest to smallest range of lens openings, i. Basically, when you change the aperture size one stop, you have to shift the shutter speed one stop in the opposite direction to maintain a consistent exposure… and this change in aperture alters the depth of field DOF accordingly.
The last element affecting depth of field is the distance of the subject from the lens — you can adjust the DOF by changing that distance.
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