f/1, f/1.4, f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16, f/22, f/32 are the usual full stops in aperture. You could have a full stop difference between two half or thirds as well.
a full stop is when the light is halved or doubled between the two settings. so in shutter speeds if the time is close to doubled or halved its considered a stop so going from 1/30th to 1/60th would be a stop and the next nominal stop down would be 1/125th of a second.
It depends on where you are seeing this number. Most shutter speed conventions do not use o1/12.5 of a second as a shutter speed; the closest would probably be 15 meaning 1/15th of a second, which is a very long/slow shutter speed usually producing blurs if you're not using a tripod. I can't think of a camera with that as a preset shutter speed but your camera might. You may possibly be looking at an intermediate f-stop (between 11 and 16) being reported on your screen or wherever these are shown (your LCD?) when you are in shutter priority mode where you are setting a fixed shutter speed and then the camera automatically adjusts for f stop (aperture) based on WB and ISO and is sophisticated enough to report an f-stop between 11 and 16).
Shutter speed is how fast your shutter opens and closes to take a picture on your camera. Shutter speed also has a lot to do with exposure. The higher the shutter speed (1/2000 example) the less light.
All cameras have multiple shutter speeds and depending the mode your camera is (Manual, Auto, etc...) the camera will choose what shutter speed it thinks will be appropriate for the picture. And most cameras will also not tell you the shutter speed you used, while some will.
When the higher or lower shutter speed either renders motion in an unacceptable way (depending on the subject matter) or the lower shutter speed is too slow for hand-holding the camera.
When using a Nikon 42x P510 camera it is very easy to slow down the shutter speed. On the side of the camera there is a dial that you can access to slow or speed up the shutter speed.
1/250-1/500
It depends on where you are seeing this number. Most shutter speed conventions do not use o1/12.5 of a second as a shutter speed; the closest would probably be 15 meaning 1/15th of a second, which is a very long/slow shutter speed usually producing blurs if you're not using a tripod. I can't think of a camera with that as a preset shutter speed but your camera might. You may possibly be looking at an intermediate f-stop (between 11 and 16) being reported on your screen or wherever these are shown (your LCD?) when you are in shutter priority mode where you are setting a fixed shutter speed and then the camera automatically adjusts for f stop (aperture) based on WB and ISO and is sophisticated enough to report an f-stop between 11 and 16).
It depends on the camera setting.Many cameras have a setting A or Av that lets you change the f-stop and the camera will change the shutter speed automatically.The manual setting (often M) will not change the shutter speed, on manual you are left to your own devices.See related link for an overview of common settings.
Shutter speed is how fast your shutter opens and closes to take a picture on your camera. Shutter speed also has a lot to do with exposure. The higher the shutter speed (1/2000 example) the less light.
You can adjust the shutter speed of Canon EOS cameras so there isn't a set shutter speed.
If the camera is in an automatic or programmed mode, yes, the shutter speed will be changed by the on-board metering system if the aperture is changed. If it's in a manual mode, no.
The shutter speed setting controls the picture exposure, or how dark or bright the picture will be. Wikipedia has some very good information on shutter speed and aperture.
Shutter speed is how fast your shutter opens and closes to take a picture on your camera. Shutter speed also has a lot to do with exposure. The higher the shutter speed (1/2000 example) the less light.
It doesn't necessarily inprove your picture. The higher the shutter speed, the less light, also the blur in a photo. A higher shutter speed will freeze a photo. A lower shutter speed will blur most motion and will increase chances of blur.
Shutter speed has a lot to do with your overall exposure. A higher shutter speed will decrease the light a lot. I was in best buy playing around with a camera and turned the camera shutter speed to 1/4000. After taking the photo, the preview was black. I realized it was because of how much higher I increase my shutter speed. Shutter speed also affects motion in a photo. A higher shutter speed will freeze all action in a photo a will less likely have a blur to it if you have a shaky hand. A lower shutter speed lets in more light while the shutter is will opened so the entire time that the shutter is open, the camera takes in all that light. Increasing chances of blur, you can also use this for crazy, funky effects! If your taking a picture of a waterfall with a low shutter speed, your gonna get a blur, which can typically look pretty epic sometimes too.
The highest shutter speed available to you will give you the darkest exposure, while the lowest shutter speed available will give you the brightest exposure
100%............If for example 1/30 of a second at f5.6 is equal to the correct exposure. By increasing the shutter speed by 100% to 1/60 of a second and leaving the aperture at f5.6 would underexpose the picture by one full stop. To correct this you would have to adjust your aperture by one stop to f4. The exposure in both pictures would be correct. However, the depth of field would be different, and anything in that was in motion would likely have less motion blur as well (provided the speed and direction was the same during both exposures).