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The “eye” – Aperture and ISO

Welcome back. I hope you had a great weekend and got to dust off your cameras because we’re getting into the actual working of the SLR/DSLR this week.
If I haven’t mentioned this yet forgive me… you can only get better by practising. Read and then go practise what we’ve talked about.

Let’s go.

1) The ISO is basically the cameras sensitivity to light. The brighter it is, the lower you want your ISO to be (100 or 200) and the darker it is the higher you want it to be. (800 – 3000)


2) Always try to shoot with the lowest possible ISO number as image noise increases as the ISO number increases. (If you’re going for the grainy look. Then feel free to raise the ISO)


Next is the aperture. The aperture is also measured in numbers. Usually from about 1.4 to 32 and the numbers accessible to you will depend on the lens you have.


When a picture is taken, the lens opens up and closes. Think of it as you opening and closing your eye. You can open it up fully or you can open it up partially.

How wide the lens opens is determined by the aperture number, which is known as the f-stop.

For the F-stop, the smaller the number, the larger the lens opens. So f1.8 would be a much larger opening than f8.


I found the diagram below online and thought it would be a good visual to take a look at.  That’s all for today. See you on Thursday for the third and last main part of shooting in manual mode.

Remember to practice, practice, practice.

visual of various aperture numbers

Image from


To view the other parts in the series click on the links below:

Part 1  |  Part 2  |  Part 3

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