Lab 3: Focal Length

Still Life

Lens: 70-100mm

Focal Length: 108mm

Aperture: f/4.5

Lens: 10-18mm

Focal Length: 12mm

Aperture: f/5.0

Lens: 18-55mm

Focal Length: 53mm

Aperture: f/5.6

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Depending on the focal length, the distortion seen in the pictures can be more accentuate. When the focal length is short (like my picture with the 12mm focal length), we can see that the distortion on the edges is more accentuate than the picture with the 53mm focal length, for example. Also a short focal length has more background than the others.

People

Lens: 18-55mm

Focal Length: 41mm

 Lens: 70-300m
Focal Length: 86mm

Lens: 10-18mm

Focal Length: 18mm

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Just like the pictures of still life, we can see that the shorter the focal length is, the more distortion is seen in the images. When you get closer to your subjects, because of the small focal length, their faces gets more distorted than if you take a bigger focal length. The depth of field is bigger depending on how small the focal length is, the background is a bit more sharp in the 18mm focal length photo than the background in the 86mm focal length photo. 

Focal Length & Depth of Field

Lens: 18-55mm

Focal Length: 34mm

Aperture: f/4.5

 Lens: 70-300mm
Focal Length: 100mm
Aperture: f/4.5

Lens: 10-18mm

Focal Length: 10mm

Aperture: f/4.5

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Just like I said previously, the depth of field changes depending on how small the focal length is, meaning that the smaller your focal length is, the more bigger depth of field there is. When the focal length is bigger, the shallower the depth of field is. 

Test Your Lens

 Lens: 18-55mm
Focal Length: 36mm
Aperture: f/8.0

Lens: 18-55mm

Focal Length: 36mm

Aperture: f/11

 Lens: 18-55mm
Focal Length: 26mm
Aperture: f/22

 Lens: 70-300mm
Focal Length: 119mm
Aperture: f/4.0

 Lens: 70-300mm
Focal Length: 119mm
Aperture: f/8.0

 Lens: 10-18mm
Focal Length: 12mm
Aperture: f/5.6

 Lens: 10-18mm
Focal Length: 12mm
Aperture: f/8.0

Lens: 10-18mm

Focal Length: 12mm

Aperture: f/16

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In the photos where I used the 10-18mm lens, we can see at the borders distortion more accentuated. We really can see the borders of the white not being perfectly straight. Also, in the images where I used a focal length of 119mm, when you get really close, it looks like there's more chromatic aberration than the pictures with a focal length of 36mm.