DigitalCamFan
aperture
Learn By Doing – Focal Length vs DOF
This week we’re experimenting with focal length vs. DOF. I thought the result was pretty cool! Using Aperture Priority, but leaving the aperture at f/5.6 for both pictures. I took this picture hand held at a coffee shop. This adds to what we have been learning… If you want a shallow depth of field there are three elements that you have to think about:
- The focal length of your lens
- The distance between you and the subject
- The aperture you select
These two pictures were hand held. I focused on the cup in the first picture at a focal length of 55mm then I simple adjusted the focal length to 18mm without changing any of my settings (except the focal length)
The picture shot at 55mm f/5.6 definitely has a more shallow depth of field!
These are the results to week 6 of Learn By Doing – How does focal length work with depth of field?
Learn by Doing – Trying out different Aperture Settings
This week we are pushing forward with aperture settings. Understanding aperture settings was extremely confusing to me at first. It seemed backwards when I would hear someone say f/16 is a smaller aperture opening than f/1.8, but apparently it’s true… This week’s assignment was to set up your camera on a tripod and just change the aperture on the same picture to see what would happen. I took five pictures ranging from f/5.6 – f/22 – ISO 100 – 55mm focal length.
Next Post will be – Why when you change the aperture does the picture go blurry? First I have to research because I have no idea! I understand that if I use a wider aperture opening like f/2.8 I will have a shallow depth of field but why?
Assignment #5 – Changing your Aperture
To find your correct exposure you need to account for three different elements. ISO, shutter speed and aperture.
Today I want to play with our aperture setting.
First off the aperture is the size of the opening in the lens. The larger the hole the more light comes in so if you have a lower f stop like f/1.8 more light will come in. A smaller aperture will have a larger number like f/22 which will let in less light, but give you more depth of field.
The best way to understand this is to practice! This weeks assignment is going to show how creative an aperture can make a picture:
1. Set up your tripod
2. Turn camera to aperture priority
3. Focus on subject a third of the way in the picture.
4. Start with your aperture on the lowest number your lens has and take a picture
5. Change your aperture at least 4 times – example 5.6 , 8, 11, 16 and 22
Don’t move your focus, don’t move your camera just change the aperture.
What happens? I know what will happen, but I still have to understand why! Besides doing the assignment this week I am going to research this week why this happens.
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