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In professional photography: What it means when someone say: "you need to stop the lens by one stop?" |
the verb stop a lens means what? and the units (one stop or half a stop) refers to what scale? A "stop" can refer to many functions of a camera from the exposure, to the aperture. One stop, up or down, when talking about a lens usually refers to the aperture, incrementally [i.e., f/2.8, f/3.5, f/5.6, f/6, f/8, f/11 and so on stopping the lens aperture size down from the largest, f/2.8 to the smallest, f/11]. And the quality of a lens has nothing to do at all with the presence of an aperture ring, this simply denotes the CPU type and whether the lens is capable of auto aperture with the camera body, typically a CPU lens will either be a D type CPU with a manual aperture ring adjustment where the lens handles metering and distance information with the camera body that does not feature an auto aperture adjustment from the body itself, and a G type CPU lens where all of the functions of a D type lens is handled with the addition of auto aperture adjustment, no manual aperture ring is needed. There are "cheapie" lenses which feature aperture rings as well. When talking about the camera itself, a stop is also an incremental adjustment to shutter speed, i.e., from 1/25 to 1/30 of a second, one stop faster. Exposure, and ISO can also be stopped up or down. So, to sum up the answer to your question, a "stop" is an incremental measurement of camera settings, and when referring to a lens, it is the aperture size, where the smallest f/number equals the largest aperture size, stopping it down would adjust for a smaller aperture size, higher f/number. I hope that helps. Peace In ANY photography, "stopping down" means to close the aperture. One stop would be from f/5.6 to f/8, f/8 to f/11 etc. ProPho "stop" is referring to the F-Stop or aperture of the lens. The most basic answer is that it controls the amount of light that enters and adjusts your depth of field. Depending on the lighting conditions when you are shooting you'd need to adjust the aperture to get the correct/desired exposure. If you look at a decent camera lense - not these cheapies that goes along with modern aim-and-shoot cameras!, You'll find there are numbers ringed around the edge closest to where the lense attaches to the camera body. They normally range from 2.8 to 32. These are called "F-stops" They are apperture settings, indicating the amount of light (in other words image) allowed to enter the lense via the lense iris. The lower the f-stop, the larger the lense opening, and vice versa the higher the f-stop, the less light is entering the lense. To stop up, or down means to adjust the lense opening by turning the f-stop ring on the lense either clockwise or anti clockwise, down being towards the smaller number, and up towards the higher numbers. In other words to stop down means you must open the lense aperture more, and to stop up means you've got to close the aperture. The amoiunt by which you must do so is indicated by the terms "half a stop, one stop, etc." Luckily for amateur photographers modern cameras are mostly automatic, and do the thinking for you in this regard. You pretty much don't have much of a say in the matter. This is something us more professional and serious photographers do not like: We prefer to do the thinking for ourselves and determine the outcome of the photograph by the settings we choose. Pro snapper! |
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