Telephoto lenses let you fill the frame with a subject and create a creamy background blur, all with little distortion. Read on to learn more about them. (Reported by Tomoko Suzuki)

Useful feature: In-camera focus stacking & depth compositing Many EOS R series cameras have an in-camera focus bracketing function that automates focus bracketing. Some have a depth compositing function that does the focus stacking for you. You can also do the stacking in editing software such as Digital Photo Professional.

ShallowfocusShot

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Remedy: Software diffraction correction Turning on the Digital Lens Optimizer or Diffraction correction under the “Lens aberration correction” function on your camera can correct diffraction on your JPEG file. Diffraction correction is also available if you develop your RAW files with Canon’s free Digital Photo Professional (DPP) software.

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Deep focus, where all elements in an image are in focus, is a technique that is often used in landscape photography and street photography. Here, we learn about 4 factors that affect deep focus. How about trying them in your next photo shoot?

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What is deep focus in filmexamples

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Deep focusshot example

Remember:  Exposure triangle With a narrower aperture, you need a slower shutter speed and/or higher ISO speed to compensate.  Take precautions for camera shake and be aware of high ISO speed image grain when shooting in low light.

Deep focus inCitizen Kane

What isshallowfocus in film

ii) The area in front of and behind the focus plane will also be in focus The area that appears in focus (depth of field) extends in front of and behind the focus plane. While the size of the depth of field depends on the 4 factors we have mentioned, it is usually larger behind the focus plane than in front of it.

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- Be aware of your lens’ closest focusing distance Objects closer than the closest focusing distance will be out of focus regardless of the f-stop.

With their versatility and focal range, standard zoom and superzoom lenses are very popular lenses especially for beginners. Let’s find out more about their special features. (Reported by: Tomoko Suzuki)

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i) Everything to the left and right of the focus point will also be in focus We put the focus point on the flower. As the camera focuses on a plane, the parts of the bench to the left and right of the flower are in focus too.

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The examples below were shot from the same spot at different focal lengths, but with the same f-stop (f/8). The focus point was kept on the panda soft toy. The buildings in the background are sharp in the 24mm shot, softer in the 47mm shot, and visibly blurred out in the 105mm shot. This shows the depth of field is larger at shorter focal lengths.

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In other words, the easiest way to ensure you achieve deep focus is to: - Use a wide-angle lens - Set it at the smallest aperture possible (highest f-stop) - Position your camera as far away from the subject as possible - Compose so that the scene has less depth.

What is deep focus in filmphotography

- Use depth of field preview By default, the Live View/EVF display camera shows the depth of field at the lens’ maximum aperture regardless of your f-stop setting. Turn on the depth of field preview to see the actual depth of field.

The following images were both shot with the same aperture (f/8) and focal length (24mm) but from different shooting distances. In both, the focus was placed on the rock. If you think the background buildings look crisper in the second example, you are right. The difference becomes more obvious when we zoom in—see the crops below!

A short focal length and narrow aperture to achieve deep focus This shot is in focus from the grass in the foreground to the mountains at the back. This was achieved by the short focal length and narrow aperture setting.

Deep focusdefinition

The images below were shot from the same position with different f-stops. The f/16 image is sharp from the flowers in the foreground to the buildings in the background. Meanwhile, the flowers are out of focus (blurred) in the f/4 image. It’s easier to achieve deep focus with a narrow aperture.

It’s not always possible to get the entire image fully in focus in a single shot. You might need to do focus stacking,  a technique that involves taking multiple shots of the same frame with slightly different focusing distances (“focus bracketing) and merging (“stacking”) them to create one final image that is sharp from front to back.

“Deep focus” refers to a state where all elements in an image are in focus. You can call it a technique that is the opposite to creating bokeh. To achieve it, you need to maximise the “depth of field” (the area of an image that appears in focus).

A flatter image can be fully in focus even with a shallower depth of field. In the scene below, the arrow sign is close to the background, so we could get everything in focus at f/4 when we shot head-on. However, shooting it from a diagonal angle added depth—that’s why the front and back of the second image are out of focus.

While a narrower aperture helps get more elements in focus, using an aperture that is too narrow could backfire. This is due to an optical phenomenon called ‘diffraction blur’, which makes details look less sharp (“softer”).

4. Depth This refers to the distance between foreground, medium ground, and background elements. Deep focus is easier to achieve with a flatter scene (less distance between the foreground, and background).