What Is Focal Length in Photography? A Beginner's Guide - how do you find the focal length of a lens
Learn more about how to make the most of wide-angle lenses in: Exploring Wide Angle Lenses Part 1: Photo Effects of Wide-Angle Lenses 24mm Closeups: 3 Simple Exercises for Mastering Wide-Angle Perspective
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Getting up close to birds and other wildlife requires a special type of telephoto lens: a super telephoto lens. You may want to combine it with an extender for even further reach.
The key aim is to bring the standard and cheaper Quest headset options to parity in terms of power and mixed reality capability. This will make it easier for developers over time, ensuring all those with current-gen headsets have access to a core cadre of features.
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These are the figures you might use when talking about a phone. But what matters most in a headset is PPD, pixels per degree. This tells you how sharp an image appears in a VR headset, because the wider the field of view a headset has, the more you’re stretching out those panel pixels. The Quest 3 is, again, better here, with 25ppd to the Quest 3S’s 20ppd.
This focal length is measured when the lens is focused to infinity (far into the distance). This is because when the lens is focused to infinity, light rays enter the lens almost parallel. When focused on a nearby subject, they enter the lens at an angle.
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Depending on the scene and your intentions, you might not need to go ultra-wide to frame what you want to show perfectly.
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Meta has announced the Quest 3S, a long-expected headset that fills out the more affordable end of the virtual reality headset lineup.
Also see: Why Is a Super Telephoto Lens Necessary for Sports Photography? What is the difference between a 200mm and 300mm telephoto lens?
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It’s not all bad news for the Quest 3S. It is rated for a slightly longer runtime off a full charge than the Quest 3, at 2.5 hours to 2.2 hours.
What gives? As well as having higher-resolution displays, the Quest 3 likely has to run them harder because the headset’s pancake lenses are typically much less efficient than the fresnel type used in the Quest 3S and Quest 2.
When you look straight ahead with your bare eyes, the field of view in focus is around 50° to 60°. Wide-angle lenses are any lens that gives a field of view wider than that. Ultra-wide-angle lenses are a special kind of wide-angle lens.
The focal length also affects many other aspects of your image, such as perspective and depth of field. To find out more, see 4 Lens Concepts to Revolutionise Your Photos.
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Learn composition techniques that leverage on the characteristics of different lenses in: Professional Composition Techniques (3): Making Good Use of Lenses
Telephoto lenses provide an angle of view that is much narrower than human vision. 70-200mm lenses provide the classic telephoto focal range.
Lenses are classified as wide-angle, standard, or telephoto depending on their focal lengths. Ultra-wide-angle lenses are a subset of wide-angle lenses, whereas medium telephoto and super telephoto lenses are subsets of telephoto lenses.
At 16mm, we can capture the entire façade of the fire station as well as the road and the hedge in the foreground. As the focal length increases, details appear bigger in the frame while more of the foreground and the building is cropped out. 200mm gives us a good close-up of the building name and the crests below it.
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Their total resolutions are 2064 x 2208 (Quest 3) and 1832 x 1920 (Quest 3S). The cheaper headset, again, matches Quest 2 quality rather than the newer model.
Ultra-wide-angle lenses take in so much that they are perfect for capturing grand scenes and large objects that are right in front of you, especially in tight spaces where you cannot move further back.
Light entering the lens converges (crosses) on its way to the image sensor. This convergence point is known as the optical centre of the lens and has the sharpest focus. The focal length is the distance between this convergence point and the image sensor.
Ultra-wide-angle lenses exaggerate perspective so distances between objects look bigger. When combined with the wide field of view, it can bring out a sense of space.
Any focal length above 135mm full-frame equivalent is considered telephoto. However, 70 to 135mm (full-frame equivalent) is considered short or medium telephoto. These are popular for portrait and product photography due to their natural perspective and comfortable working distance for close-up shots.
What is focal lengthof lens
Learn more about what you can do with a standard lens in: Standard Lens Techniques: Using the Point of View to Draw the Viewer In 50mm Portraits, My Style: Creating A Picture of a Memory
The Meta Quest 3S is effectively a Quest 2 upgraded with color passthrough cameras, the Quest 3’s controllers and a much better processor.
You need a very long focal length to capture a detailed close-up picture of the moon without cropping. The image above was captured at 1600mm using an 800mm lens and a 2x extender.
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Notice how the buildings don’t appear to converge towards the top. They would on a wide-angle lens due to perspective exaggeration.
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This should be of interest to the many Quest 2 owners who still like VR but are disappointed by all the Quest 3 upgrades they are missing out on. But does the Quest 3 still provide a legitimately better image? Sure it does.
When picking a lens, one of the first things you must decide on is the focal length or focal range that you want. This is because the focal length describes the angle of view, i.e., it tells how much of the scene in front of you the lens can capture.
It’s not just about better peak sharpness, but the way the sides of the images are radically clearer. It makes looking around with your eyes, instead of your head, much more viable. And it leads to a headset less picky about fit, as the lens sweet spot is wider.
A standard or “normal” lens gives a perspective that is very close to that of human vision. Most kit lenses are standard zoom lenses. The popular RF50mm f/1.8 STM “nifty fifty” lens is a standard lens on a full-frame camera, whereas the RF28mm f/2.8 STM is a slightly wider standard lens on an APS-C camera.
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Human eyesfocal length
Let’s look at what happens when we shoot at different focal lengths from the same position. Note: For ease of illustration, the angles shown in this article are the horizontal angle of view.
What does this mean in practice? You get a reduced porthole effect, which is where it seems more like you’re looking through a restricted window rather than just seeing the virtual world as you would with your eyes.
A shorter focal length… - Captures more of the scene (= has a wider angle of view) - Makes distant objects appear smaller (= has lower magnification)
Due to physics, a lens with a shorter focal length has a wider angle of view, and one with a longer focal length has a narrower angle of view. And that’s how we came to use focal length to describe the angle of view of a lens!
Sure enough, the Quest 3 does have a better, wider field of view than the Quest 3S. The Quest 3’s is rates at 110 degrees horizontal, 96 degrees vertical. The Quest 3S’s is 96 horizontal, 90 vertical.
The Meta Quest 3S uses fresnel lenses, just like the Quest 2. Meta upgraded to pancake lenses in the Quest 3, and I found this upgrade the most substantial visual change in the generation.
A longer focal length… - Captures less of the scene (= has a narrower angle of view) - Makes distant objects appear bigger (= has a higher magnification)
We usually describe a lens by its focal length. What does it refer to and how does it affect your images? Find out in this article.
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