Category Archives: Focal Lengths

Focal Lengths

Exercise – Focal Lengths and Different Viewpoints

This exercise required that two photos be made of the same tightly framed scene, but in which the physical location from where each photo is moved either forwards or backwards. In addition, in order to maintain the exact same framing of the picture from each point of view, the zooming level of the lens had to be manipulated between wide and narrow fields of view. The idea is to show how perspective can change.

 

Photo 1 – Furthest position from the subject and narrowest field of view

DSC_0064

ISO1000, 105mm, f/5.6, 1/400sec

 

 

Photo 2 – Nearest position to the subject and widest point of view

DSC_0065

ISO1000, 18mm, f/3.5, 1/640sec

 

The photos I took were of a table and chairs. The chairs behind the table helped to show by how much the field of view is compressed. The perspective in the first photo appears quite flat. Little sense of depth can be discerned, and it’s not easy to determine just how far behind the table the chairs may be. The second photo gives a very strong sense of perspective. Though the size of the table remains roughly the same between the image, the chairs are now seen in almost their entirely. the lines of convergence produced by the tiles on the floor are now much more acute. This image gives a better sense of the physical properties of the subjects and their placement within the scene.

Exercise – Focal Lengths: For Cameras With Variable Focal Lengths

This exercise required a series of photos of a scene wherein the focal length of the cameras’ lens is varied from its’ widest to its’ narrowest field of view. I used a Nikkor AF-S 18-105mm zoom lens.

Photo 1: 18mm

ISO900, 18mm, f/3.5, 1/4000sec

ISO900, 18mm, f/3.5, 1/4000sec

Photo 2: 26mm

ISO1000, 26mm, f/4, 1/4000

ISO1000, 26mm, f/4, 1/4000

Photo 3: 38mm

ISO1000, 38mm, f/4.5, 1/2500

ISO1000, 38mm, f/4.5, 1/2500

Photo 4: 50mm

ISO1000, 80mm, f/5.6, 1/1600

ISO1000, 80mm, f/5.6, 1/1600

Photo 5: 80mm

ISO1000, 80mm, f/5.6, 1/1600

ISO1000, 80mm, f/5.6, 1/1600

Photo 6: 105mm

ISO1000, 105mm, f/5.6, 1/1600

ISO1000, 105mm, f/5.6, 1/1600