Wednesday 8 February 2017

Lab 3 : Focal Length



 f/5.6 - 1/160 secs. - ISO 400
18mm (18-55mm)

f/5.6 - 1/125 secs. - ISO 400
55mm (18-55mm)
Still-Life :
On the first image, where the focal length is 18mm, there is more background than on 55mm one. We see a big difference of distortion from one image to another, because of its focal length.


f/3.5 - 1/60 secs. - ISO 800
18mm (18-55mm)



f/1.8 - 1/60 secs - ISO 400
50mm

Portrait :
From the 18mm to the 50mm, we see a huge distortion. On the first image, there is more background and the faces look more distorted than on the second one. The depth-of-field changes as well from one image to another because of my aperture, but also because of my focal length.

f/2.8 - 1/80 secs. - ISO 800
70mm (70-200mm) 


f/2.8 - 1/160 secs. - ISO 800
105mm (70-200mm)


f/2.8 - 1/100 - ISO 800
135mm (70-200mm)


 f/16 - 1/60 secs. - ISO 3200
70mm (70-200mm)
f/16 - 1/30 secs. - ISO 3200
105mm (70-200mm)


f/16 - 1/30 - ISO 3200
135mm (70-200mm)

Part 2 : Focal Length and Depth-of-Field
For these images, I had to change lens because my 18-55mm f3.5-5.6 didn't show any big difference from a wide to small aperture. We see a huge difference of depth-of-field from the f/2.8 and f/16, the background is much blurrier on the f/2.8 shots.


f/4 - 1/125 secs. - ISO 100
18mm (18-55mm)


f/5.6 - 1/80 secs. - ISO 100
18mm (18-55mm)


f/8 - 1/40 - ISO 100
18mm (18-55mm)


f/11 - 1/20 secs. - ISO 100
18mm (18-55mm)


f/16 - 1/10 secs. - ISO 100
18mm (18-55mm)


f/22 - 1/5 secs. - ISO 100
18mm (18-55mm)


f/5.6 - 1/80 secs. - ISO 100
30mm (18-55mm)


f/8 - 1/40 secs. - ISO 100
30mm (18-55mm)

f/11 - 1/20 secs. - ISO 100
30mm (18-55mm)


f/16 - 1/10 secs - ISO 100
30mm (18-55mm)


f/22 - 1/5 secs - ISO 100
30mm (18-55mm)


f/5.6 - 1/50 secs - ISO 100
55mm (18-55mm)


 f/8 - 1/30 secs - ISO 100
55mm (18-55mm)

 f/11 - 1/15 secs. - ISO 100
55mm (18-55mm)


f/16 - 1/8 secs. - ISO 100
55mm (18-55mm)


f/22 - 1/4 secs. - ISO 100
55mm (18-55mm)

Part 3 : Test your lens
Everything went pretty well for this part, the only difficulty I got was because of the different focal lengths I had to use. I had to get closer or further away from the target, it wasn't much but sometimes it could be difficult. Also as of aperture speaking, as my f-stops got smaller (ex: f/22), the clearer everything got. I don't see a HUGE difference but the difference is still there.










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