This will be discussed in more detail, and illustrated with an example, in the next section. At longer exposures the second curtain will start closing well after the first one is fully open, so it is hard to speak about a "slot" the thing works more like a window, opening entirely and then closing again.īecause the slot is moving immediately in front of the film (sensor), various points (or rather bands) of the image are exposed at various time, although each gets the same length of exposure, assuming the shutter is not malfunctioning. That width is used to adjust the exposure time (referred to as shutter speed), while the actual velocity with which the curtains are moving remains unchanged. Even if the slot is not moving very fast, the exposure time is equal to the time it takes the curtains to travel over the slot width. In this design, a slot between two cloth curtains (now they are made of metal or plastic composites) is moving immediately in front of the image plane (film or sensor). The only exceptions were the E-10 and E-20 from Olympus, SLRs with non-interchangeable zoom, and the highest shutter speed of 1/640 s, which led to lots of complaining.įocal plane shutters have been around for a long time, at least since the end of the XIX century. In the digital world, leaf shutters are used exclusively in non-SLR cameras. (Some leaf-shutter cameras go up to 1/2000 s or higher, but I suspect there is electronic gating involved here.) Obviously, when you increase the shutter speed, at some value the shutter will have to start closing as soon as it opens that's why the maximum speed of leaf shutters is often limited to 1/500 s or 1/1000 s. It is a definite advantage when using flash as a fill-in outdoors.Ī limitation of a leaf shutter is that it needs some time to open fully (and than, again, to close): during those two phases the lens is partially obstructed and your sensor gets less light than it should.
#LIGHT POLE SLANTED CAMERA LENS DISTORTION PLUS#
This is a plus when shooting with flash, as its very short light burst (about 1/1000 s or even less) can be captured in the whole image at any shutter speed (as you will see, the other type of shutter allows for flash use only with exposures longer than a certain value). One is the leaf shutter, sitting usually (but not always) within the lens opening and closing in a sequence as shown in this picture.īecause the leaf shutter is located far away from the image plane, all points of the image are exposed to light at the same time. Two kinds of shutters, differing greatly in the way how they work, are most common. In either case, the more advanced the camera is (and the better image quality it delivers), the greater are the chances that it will have a shutter, not just an "electronic shutter" (which, actually, is not a shutter at all), but a mechanical one, albeit electronically controlled.
![light pole slanted camera lens distortion light pole slanted camera lens distortion](https://i.ytimg.com/vi/2h4MQ8zA_Vg/maxresdefault.jpg)
Even those, however, may need some period (a fraction of a second) in the dark before the actual exposure, so they may need a kind of shutter, closing just before the exposure and re-opening for it, even if it does not actually set the effective exposure time.
![light pole slanted camera lens distortion light pole slanted camera lens distortion](https://i.ytimg.com/vi/DoaYLbsVVbI/maxresdefault.jpg)
Some digital camera sensors, however, allow for electronic gating of the signal: the response of sensor to light is collected within (and averaged over) only a certain amount of time, adjusted by the circuitry. Yes, you knew that, but maybe one day you will bring here a friend who does not.Ī film camera always needs a shutter. Just for the record: a shutter in your camera is a device whose sole task is to regulate the time of exposure of your sensor (or film) to the image-forming light incoming from the lens.