The only thing you need to know about, really, is that there are a whole load of different pieces of glass inside. * 1) Vivitar Series 1 High Definition Wide Angle Fisheye 0.21x Lens – The Vivitar .21x Wide Angle Fisheye Coversion Lens is specially designed for high quality digital cameras and camcorders. This will invariably result in blurry shots, so you may have to turn your IS feature off when you’re going out on a limb creatively. If you use filters on your lens, you should be aware that some filters (notably polariser filters) are different depending on their orientation. It renders subjects up to 5x life-size magnification. If we zoom all the way in, we have gone from a 28mm focal length to a 135mm focal length, and the images you are taking are magnified by 4.8x. The only thing distance indicators are really good for is to remind you what the minimum focusing distance (i.e. , … The gotcha here is that it isn’t always completely predictable where your lens will be the sharpest. It’s ludicrously sharp, delivers fantastic autofocus performance, and is one of my all-time favorite lenses. It is important to understand the difference between variable aperture and non-variable-aperture lenses, especially if you plan to do a lot of your photography at the ‘far’ end of your zoom range, but if you’re aware of the trade-offs, don’t be put off by ‘em. Your lens has to connect to your lens somehow — and it does so via a lens mount. When you are taking photos at f/22 (a relatively small aperture), and you focus your lens on infinity, you might find that everything from about 3 meters and onwards is pretty much in focus: This is great, but what about the huge amount of things beyond infinity that would be in focus? So, a f/2.0 aperture on a focal length of 100mm is a 50mm hole. lens Light rays converge when passing through a biconvex lens and diverge when passing through a biconcave lens .f indicates the focus. You can skip over … Iris control voltage is supplied from a circuit located within the camera. 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. So, if you purchased a 70–200mm zoom lens, and attached it to a camera with a 1.4x crop factor, your lens would be an equivalent to a 98–280mm lens. 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. 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. 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. If you’re looking to spend $700 on a camera body, it isn’t such a bad idea to budget another $700 on lenses, too. You can learn more about focusing screens on the internet, but be aware that it’s mostly a historical curiosity at this point. Not all lenses are created perfectly, and all lenses have smaller or greater amounts of distortions. Or, y’know, the current version of it. You might be surprised to hear that ‘in focus’ is a contentious subject, where things can get very confusing very quickly, but for the purpose of this article, let’s say that something is either in focus or not in focus. Filter by Department: We couldn't find any related products. Interchangeable lenses If the camera has interchangeable lenses you have more flexibility because the lens detaches from the camera allowing it to be replaced by a different one. Tele-converters (TCs) are spacers that go between a camera body and a lens. You may have seen ‘Asph’ or ‘Aspheric’ marked on a camera lens or in lens specifications. The oldest lens I currently use is nearly 15 years old, and it’s a 70–200mm f/2.8. The non-technical definition of the focal length of a digital camera lens is the distance between the lens surface and the image sensor.