Here is some images I produced at: http://www.canonoutsideofauto.ca/play/
ISO: 12800 Shutter Speed: 90 Aperture: 22
ISO: 100 Shutter Speed: 90 Aperture: 2.8
ISO: 6400 Shutter Speed: 45 Aperture: 22
ISO: 200 Shutter Speed: 45 Aperture: 2.8
ISO on a DSLR is a digital setting that allows you to control the sensitivity of the sensor in the same way as on original film stock the ISO was controlled by the size of the photosensitive salt grains, smaller grain smoother image larger grain more surface receiving light.
Artistic Uses: by raising the ISO the image will become more grainy which will add a grungy feel to the film which is effective for making a film look older or for creating a rustic unstable feeling to a situation. In the opposite way a low ISO will create a smooth looking clear image which makes it look very professional and clinical.
Practical side effects: A high ISO will create a brighter but more grainy image whilst a low ISO will have a darker but smoother image. If the ISO goes to high you will get color noise which will cause colored specs on the image or an overall tint.
The aperture on a camera is controlled by the aperture ring or ‘iris’ and is used to control how much light is let into the camera as well as the depth of field. Depth of field is effected by the aperture because of how it effects the focus. Focus is where light hits a lens diffuses then realigns on the sensor when the aperture is acute there is less light but the light at certain distances don’t realign before while at a large aperture allows more light in and realigns the diffused light more.
Artistic uses: the aperture can be used to control the depth of field which helps to command the viewers attention and hide things you don’t want the audience to notice whether that be a low quality set or a monster stood behind someone.
Practical side effects: changing the aperture / iris effects the light. The wider the iris the more light will be able to get in and vice versa which means that the more things you want in focus the darker the image will be.
The shutter speed effects the speed at which eace photo is taken for instance 50 fps means that the shutter will be open for one 50th of a second to take the image. The longer the sensor is exposed to the light the brighter the image will appear and the more motion blur will occur on moving objects.
This can be used by following a moving object so that the background is blurred. it can be used on the other hand to make images sharper and motion more crisp which can be very weird but engaging for an audience.
frames per second allows for slow motion as it is played at 25fps so anything over that can be slowed down so that things that are too fast to see can be shown at our speed.
The worlds fastest camera shown above films at 4.4 trillion fps meaning what you see is slowed down one hundred and seventy six billion times in other words a seconds worth of filming results in over 6000 years worth of footage.