Each lens manufacturer uses different terms to say the same thing. So even if we already understand the meaning of Nikon or Canon lens for example, we will still be confused to see the terms Sigma lenses! Unfortunately we haven't memorized the terms used by each lens manufacturer to name their lenses, so maybe if you want to be able to add some terms to other lenses. The author himself understands little about the terms Nikon and Canon lenses, for other brand manufacturers it is very minimal because they do not have them and have never used them. Especially the term on the Leyca camera heuheu is waiting for a legacy if this . Ok, starting with the topic, understand the term on the lens Focal Length or Lens Focus Point Distance Ok, we start from the term focal length. The term Fix, zoom, tele, wide, it indicates Focal Length or FL lens. In a sense, the Focal Length has a technical definition, namely the distance of the lens's flame point to the sensor. The easy focal length is the distance between the lens and the focal plane (sensor in a digital camera or movie on an old camera) where your photo is formed. FL or Focal Length displayed in units of mm (millimiter) and in photography symbolized f. The focal length determines how wide the lens is. The shorter the focal length, the wider the sweep of the view. The longer the focal length, the narrower the sweep. Lenses with short focal lengths in the world of photography are usually called wide angle lenses, usually characterized by small numbers such as 10mm etc. Lenses with long focal lengths are usually referred to as telephoto lenses, for example 200-400mm, 600mm, etc. The term fix lens itself is a lens with fixed or single or single focal length. For example a 50mm, 24mm, 85mm, 105mm lens, etc. As for the medium lens is a lens that usually has a focal length range between 35mm and 85mm, for example 17-55mm. Well, have you ever heard the term broom lens in the universe? the lens itself is a lens that has a focal length from wide to telephoto. For example, the universal brush lens is the 18-200 lens, 28-300 etc. The wide and telephoto limits of each person are different, for that the kit lens is called an 18-105mm lens, 24-120mm or 18-135 can also be referred to as a universal lens. What is important from the universal brush lens is that with just one lens we get FL near and far where there is no need to replace the lens. One factor in the selection of FL / focal length lenses is the working distance or the area of the room, aka outdoor or indoor. When shooting in a room, especially a narrow one, the telephoto lens meets the stone. The wall is tight, the model is just photographing the head Even though the telephoto lens is good at shooting models in the park / outdoor Aperture or Diaphragm After knowing what focal length is, let's shift to the term Aperture or Diaphragm on the camera lens. The diaphragm is displayed with an F / ... (number) sign. For example f / 2.8, f / 5.6, f / 22. The diaphragm number indicates how wide the opening is. The smaller the number, the wider the opening. The clear width of this opening determines the amount of light that the sensor can capture. Just imagine a wide vs. narrow window. Lenses with wide openings such as f / 2.8 are usually more expensive than lenses with a width of f / 3.5. For example, lens kits / standard DSLRs that usually have specs 18-55mm, f / 3.5 - 5.6. This spec means that the lens has an FL range of 18mm to 55mm. At FL 18mm, the lens has a maximum aperture of f / 3.5, while in FL 55mm the lens has a maximum aperture of f / 5.6. If a zoom lens only has one aperture number written down, it means that the zoom lens has the same maximum aperture, regardless of the FL used. For example, the 17-50mm f / 2.8 lens, the lens can be opened up to a maximum of f / 2.8, from the most wide FL (17mm) to the most tele (55mm) is certainly more expensive now . For more details what are openings / diaphragms / apperture please read the photographic article about Understanding Aperture Definition in Detail. VR / IS (Vibration Reduction / Image stabilization) VR on Nikon and IS at Canon is a stabilizer technology on the lens to minimize hand vibration when shooting at low speeds. By using a VR / IS lens, the possibility of blurry images can be avoided because the VR / IS element will compensate for vibration, it is said that the ability is up to 3-4 stops. Vibration Reduction or Image stabilization when interpreted in general is a camera brackets. As in the vehicle, the sokbreker functions to dampen the vibration effect. Likewise the IS / VR on the camera. This VR / IS feature is very helpful. Want a wide lens (18mm on lenskit) or telephoto (200mm at 70-200), useful too. If there are questions, choose lenses with VR / IS features or lenses with wide openings, for example 70-200 / 4 IS or 70-200 / 2.8? the answer depends on the needs you want to use to take pictures of the fuck. Lens with wide openings (f / 2.8) the effect of a shutter speed can be high eg 1/500 ″. Whereas at f / 4 the speed must be lower 1/250 ″. If you want to take action or objects with fast movements, select 70-200 f2.8. While the 70-200 f / 4 IS is a lens that can be used if the condition is low light but non action. The mechanism of Vibration Reduction or Image stabilization is called IS (Canon), VR (Nikon), VC (Tamron), OS (Sigma), OSS (Sony E), etc. Expensive Lenses and Cheap Lenses Expensive lenses usually have wide openings, and have a difficult level of optical design to get sharpness when using wide openings. Expensive lenses are usually made of materials that are sturdy, full metal. Of course it will be quite heavy. Like school titles, expensive lenses have several titles as their features. Let's say VR, ED, Nano coating, SWM, IF, etc. Auto focus on expensive lenses is certainly faster and silent aka not noisy when focusing on work. There are still many other camera lens terms that refer to various things. Please check the website of each manufacturer to see the list.
