*Official* Post Your Pictures Thread

I hate those gum guards. We have to wear them at school when playing rugby. Basically you can't talk properly for an hour and when you spit it out at the end of the lesson your mouth feels all weird. The teachers love them though because it's the best way to shut up the kids. ;)
 
Young, wild and...not so free

mMrOB.jpg
 
Jamebonds1 said:
Nice! How you do that? With 30 sec shutter?
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Basically just use a slow shutter speed. You can't see the people because when you use long exposures with people moving, they aren't often captured by the camera, as shown below:


Missed the Train? by JasonBrown2013, on Flickr

I took the shot on a 30 second exposure. The train pulled up at the station, the people got off, walked straight past the camera whilst the shutter was still open, and then the train started moving again as the shutter closed. As you can see, the people getting on and off the train aren't caught at all.
 
Yes. Aperture size determines how much light can come in and the shutter speed determines how long the light comes through for. So normally for long exposures during the day you want a small aperture and slow shutter speed, while at night you want a larger aperture and slow shutter speed.
 
voyagerfan99 said:
Yes. Aperture size determines how much light can come in and the shutter speed determines how long the light comes through for. So normally for long exposures during the day you want a small aperture and slow shutter speed, while at night you want a larger aperture and slow shutter speed.
Click to expand...

Is the aperture like the iris?
 
Turbo10 said:
Is the aperture like the iris?
Click to expand...

Aperture is how wide the opening in the lense is. The wider the aperture (confusingly this means a smaller F number) the more light that can come in.

ISO speed is the sensitivity of the pixels, e.g. how much light they can collect. The higher the ISO the more light will be collected (irrespective of the shutter speed or aperture).

Shutter speed is obviously how long the shutter is open for revealing the sensor.

Between these three variables there is the sweet spot, although all three have disadvantages: Aperture controls how much area is in focus (compare the portrait and landscape modes on a normal camera), a high ISO will be noisy (grainy) and a long shutter speed will blur moving objects/if you shake.

With these pictures the shutter speed was fixed in order to create the orbs, so I had to alter the ISO and aperture to let in the right amount of light without to much noise.
 
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