multifocal lens: a lens with segments providing two or more powers; commonly, a trifocal lens. Note that the focal length stays the same — but the apparent focal length is different because of the different sensor size. optical lens. You may have seen ‘Asph’ or ‘Aspheric’ marked on a camera lens or in lens specifications. They were also competitively priced. Meaning of camera lens. Ø — You’ll often find the ø symbol on a lens, followed by a number of millimeters. If you’re taking photos straight into a light source, you’re out of luck, but if you’re merely trying to block out stray light hitting the front lens element, a lens hood might be your best friend. DX (Nikon) / EF-S (Canon) — these are lenses that are created for less-than-full-frame camera bodies, typically the APS-C-size sensors found in digital cameras. The main challenge is that you don’t just want the lens to be sharp in one place: You want your photo to be perfectly sharp across the entire width of the photograph, all the way out into the corners. I defy anybody to tell much of a difference between photos taken by two subsequent camera bodies, for example, but pick up a 2010 body and compare it to a current camera body, and you’ll be amazed how different the camera bodies are. The only thing you need to know about, really, is that there are a whole load of different pieces of glass inside. I’ve written a fair bit about how to ensure your photos are as sharp as possible. Asph / ASP — This stands for Aspherical, and is a designation some lens manufacturers like to put on lenses that have non-circular lenses built in. You’ll often see this effect used in skateboarding videos, for example. camera, photographic camera - equipment for taking photographs (usually consisting of a lightproof box with a lens at one end and light-sensitive film at the other) closeup lens - a photographic lens with a short focal length used to take pictures at short ranges. As simple as that sounds, there’s a hell of a lot of science that goes into lens design. In normal-people-English, imagine that a particular portion of your image needs to be in focus. When Founding a Startup, the Conversation Starts at Home. The science boffins came up with a way of changing the configuration of photographic lenses so it became possible to move the nodal point (as you’ll remember, that’s the point where the image flips upside down inside the lens) closer or further away from the imaging sensor. We’ve talked about focal lengths, and I’ve hinted at the fact that some lenses can have more than one focal length: The very first lenses all had only a single focal length, but then, the clever engineers started thinking: Wouldn’t it be nifty if a single lens could have several focal lengths? Typically, these lenses can reproduce small objects at up to 0.5x life size on a camera’s imaging sensor. Now, set it to automatic focus, and gently turn the focusing ring. The distance from this point to your imaging sensor is your ‘focal length’: The Focal length of a lens describes how wide its field of view is, and this, in turn, is directly proportional to how ‘wide’ a lens is. Here is how lens compression affects our images at various focal length and distance: When you shoot with a wide angle lens like the Canon 24mm f/1.4L II, several things happen.As you shoot from a closer distance to your subject, objects that are closer to you will appear a far larger than objects that are farther away. In the most literal sense, a DSLR camera is a digital single-lens reflex camera. See more. All Free. Because the building is not, you need to use a small aperture to photograph the building, which has its own challenges. The most common telephoto zoom lenses have a focal range of 70mm to 200mm. In other words, it’s got a wider field of view than a normal lens, which has a focal length of somewhere between 40mm and 58mm on a full frame camera.. RELATED: What Is a "Normal" Camera Lens? The larger the distance, the stronger the magnification factor of the lens. A lot of things in photography have gotten better, but one thing has gotten a lot worse: Old manual-focus cameras used to come with a focusing screen — it’s a device that helps you manually focus. The oldest lens I currently use is nearly 15 years old, and it’s a 70–200mm f/2.8. The outside of the lens has a lot of different controls and attachments. Personally, I use an UV filter on lenses that I carry around with me a lot, because I do knock them into things some times — but I’ll take the UV filter off when I’m taking photos like cityscapes, or scenes where I’m taking photos into the light. D. Top. That is because EF-S lenses are designed for smaller sensors — this has advantages (if a lens doesn’t have to illuminate a full-size sensor, there’s no point in using the extra glass required; so lenses can be smaller and lighter), but it also has disadvantages: if you trade up to a full-frame camera body later, you can only take your EF lenses across, not your EF-S ones. 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