ISO, aperture, shutter speed – take 2

Well, that was an interesting exercise… how did you get on?

Last time I briefly explained ISO (light sensitivity), aperture (opening size of shutter) & shutter speed. I then sat my toy dragon on a table inside in a well-lit area. I set my camera on “auto” – portrait (because I didn’t want background images to be focussed) and took a photo.

ISO: 100   Aperture: 4.5  Shutter speed: 1/160
ISO: 100   Aperture: 4.5  Shutter speed: 1/160

I then switched to manual mode , changed the ISO and took some more photos:

ISO: 200   Aperture: 4.5  Shutter speed: 1/160
ISO: 200   Aperture: 4.5  Shutter speed: 1/160
ISO: 400   Aperture: 4.5  Shutter speed: 1/160
ISO: 400   Aperture: 4.5  Shutter speed: 1/160
ISO: 1600   Aperture: 5  Shutter speed: 1/160
ISO: 1600   Aperture: 5  Shutter speed: 1/160

Personally, I prefer the 2nd photo with the ISO of 200 as the colours are brighter and there is more clarity to the dragon.  So now I will set the ISO to 200 and “play” with the aperture.

ISO 200 Aperture f5.6 Shutter speed 1/160
ISO 200 Aperture f5.6 Shutter speed 1/160
ISO 200 Aperture f6.3 Shutter speed 1/160
ISO 200 Aperture f6.3 Shutter speed 1/160
ISO 200 Aperture f7.1 Shutter speed 1/160
ISO 200 Aperture f7.1 Shutter speed 1/160
ISO 200 Aperture f8 Shutter speed 1/160
ISO 200 Aperture f8 Shutter speed 1/160

So with ISO 200 and shutter speed constant on 1/160, the aperture is best on f6.3.

Now let’s play with the shutter speed leaving the ISO constant on 200 and the aperture set at f6.3.

ISO 200 Aperture f6.3 Shutter speed 1/40
ISO 200 Aperture f6.3 Shutter speed 1/40
ISO 200 Aperture f6.3 Shutter speed 1/60
ISO 200 Aperture f6.3 Shutter speed 1/60
ISO 200 Aperture f6.3 Shutter speed 1/100
ISO 200 Aperture f6.3 Shutter speed 1/100
ISO 200 Aperture f6.3 Shutter speed 1/125
ISO 200 Aperture f6.3 Shutter speed 1/125

Now, I don’t know that I have really come to any conclusions but it has been an interesting exercise anyway 🙂 I have it set in my mind once again, after many years of using auto mode, that ISO is to do with light sensitivity and basically, the brighter the light, the lower the ISO, the smaller the aperture (f-stop) and the faster the shutter speed.

So, to go to the other extreme but staying with ISO, aperture and shutter speed, my next exercise will be to take some similar photos at night with little or no light. Of course, I will need to set the camera on a tripod for this…

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