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Session 12 Macro photography
Macro photography involves taking extreme close-up photos of tiny objects using special macro lenses. Macro lenses have long barrels for close focusing and are optimized for high reproduction ratios, with focal lengths ranging from 50mm to 200mm or more. The focal length determines the lens's magnification and angle of view, affecting how much of the background is included and the level of background blur. Longer macro lenses require more working distance but compress the subject more.
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Session 12 Macro photography
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- 2. MACRO PHOTOGRAPHY ! ! ! consists oftaking 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
- 3. MACRO LENSES ! ! ! designed forclose-up work with a long barrel for close focusing optimized for high reproduction ratios Canon Macro 100mm f28
- 4. FOCAL LENGTH ! The focallength of macro lenses: ! from 50mm to 200mm ! others range to 470mm
- 5. FOCAL LENGTH • Thedistance 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:
- 6. TELEPHOTO • This means a400mm 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."
- 7. F/STOPS F-stop is thefocal 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.
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- 22. MACRO LENSES ! ! ! ! L-R Canon EF-S60mm f/2.8 Macro USM lens Canon EF 100mm f/2.8 Macro USM lens Canon EF 180mm f/3.5 ML USM lens
- 23. MACRO LENSES ! ! ! ! L-R Sigma 105mmf/2.8 EX DG Macro lens Tamron 90mm f/2.8 DIi Macro lens Canon EF 100mm f/2.8 USM Macro lens
- 24. MACRO LENSES ! ! ! ! L-R (extendedin 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
- 25. Background Blur Comparison Sameaperture setting (f/16) and identical subject to background distances.
- 26. FOCAL LENGTH ! ! ! The focallength 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.