 BetterPhoto Member |
f/stop, shutter speed question Hello, I have a photo assignment I have to do. I took a picture using f/9, 1/125. My question is: I am sapose to make another shot but make it +3 stops higher. Do I only change the shutter speed, the f/stop or both? Thank you
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- Gregory LaGrange Contact Gregory LaGrange Gregory LaGrange's Gallery |
Depends on what the teacher is trying to show you. If you're supposed to maintain correct exposure, it's sounds like an assignment to demonstrate depth of field and you should change both. Otherwise, you can do it any way you want.
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Alan N. Marcus |
Hi Amber, An f/ stop represents a two times (2X) change in light level inside the camera. Your teacher is asking you to increase the exposure energy by 3 f/stops. That’s 2 times 2 times 2 the answer is 8. Stated another way, 3 f/stop + change increases the exposing light 8 times above the current light energy that made the exposure which was f/9 @ 1/125 second. You can achieve this light gain in several ways. You can cause by only changing only the shutter speed this slows the shutter giving the light more time to play of the chip thus more exposure energy will be seen by the camera. 1/125 = current exposure You can increase by only changing the f/number this opens up the aperture allowing more light to pass through the lens into the camera.
Special note: You might want to known that f/number f/9 is not in the above number set because it is not a full stop (2X change from its neighbor actually it falls between f/8 and f/11 and it’s a 1/3 f/stop. Alan Marcus (dispenses technical gobbledygook)
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