Download - Session 12 Macro photography
MACRO PHOTOGRAPHY Basic Photography Class
MACRO PHOTOGRAPHY
! consists of taking close-up photos of tiny objects
! extreme close-up shots
! a perspective that shows extraordinary angles of tiny things that are usually not part of the normal human scene and view
MACRO LENSES
! designed for close-up work
! with a long barrel for close focusing
! optimized for high reproduction ratios
Canon Macro 100mm f28
FOCAL LENGTH
! The focal length of macro lenses:
! from 50mm to 200mm
! others range to 470mm
FOCAL LENGTH
• The distance from the lens to the sensor, when focused on a subject at infinity.
• focal length equals image distance for a far subject.
• To focus on something closer than infinity, the lens is moved farther away from the sensor. This is why most lenses get longer when you turn the focusing ring.
• The distances follow this formula:
TELEPHOTO
• This means a 400mm lens should be 400mm long.
• If you get out your ruler and measure it, you will find it is less than 400mm.
• That is because a camera lens really has many individual glass lenses inside, and this makes it behave as if it is longer than it really is.
• This is called "telephoto."
F/STOPS
F-stop is the focal length divided by the diameter of the lens. For example, a 200mm f/4 lens will be 50mm wide. Get out your ruler and measure it.
200mm/50mm = f/4. That is why f-stop is typically written as F/4, meaning "focal-length over 4" or "focal-length divided by four”.
Lenses are marked with a series of f-stops, each one lets in half as much light as the previous one. The light-gathering ability of a lens is determined by its area, and f-stops are determined by diameter. Area is related to diameter squared. The progression of f-stops, 1 - 1.4 - 2 - 2.8 - 4 - 5.6 - 8 - 11 - 16 - 22 - 32, are powers of the square root of 2.
24MM
35MM
50MM
100MM
200MM
400MM
800MM
2100MM
FOCAL LENGTH
FOCAL LENGTH
FOCAL LENGTH
FOCAL LENGTH
FOCAL LENGTH
FOCAL LENGTH
MACRO LENSES
! L-R
! Canon EF-S 60mm f/2.8 Macro USM lens
! Canon EF 100mm f/2.8 Macro USM lens
! Canon EF 180mm f/3.5 ML USM lens
MACRO LENSES
! L-R
! Sigma 105mm f/2.8 EX DG Macro lens
! Tamron 90mm f/2.8 DIi Macro lens
! Canon EF 100mm f/2.8 USM Macro lens
MACRO LENSES
! L-R (extended in their shotest focus)
! Sigma 105mm f/2.8 EX DG Macro lens
! Tamron 90mm f/2.8 DIi Macro lens
! Canon EF 100mm f/2.8 USM Macro lens
Background Blur Comparison
Same aperture setting (f/16) and identical subject to background distances.
FOCAL LENGTH
! The focal length also affects other macro photography aspects.
! Longer focal lengths require more distance to acquire the same subject framing. The result is a change of perspective - the telephotos compress/flatten the subject features more than short focal lengths.
! The wider angle of view of the short focal length macro lenses mean that more of the background will be in the picture - and that the background will be less-diffusely blurred.