Perspective: Telephoto Effect
The only difference in these 2 images is that one was taken with a normal lens (left) and the other with a long lens. The subject is standing in the same place (50 feet from house), and the camera also remained at the same spot.
The result is...
- The normal lens gives greater perspective between the subject and house.
- There is no or very little perspective when using a long lens.
- The subjects hight is (almost) the same in both.
A zoom lens was used to replicate a normal and long lens.
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Lens sharpness and level of acceptable focus.
The lens is the sharpest when using f stops in the middle range. All of these would be considered to be in focus.
The lettering is about 1.5 inches long. Taken at 10 feet using a normal lens. Normally there is a slight improvement in sharpness at f11.
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Cone of Confusion: large aperture
The beams on the outer edges of the lens
- Sometimes don't hit exactly where they should.
- Create a circle instead of a sharp point.
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Diffraction: small aperture
Light beams passing through a small orifice diverge and interfere with each other blurring the overall image.
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