2. 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 3. MACRO LENSES !!!designed for close-up work with a long barrel for close focusing optimized for high reproduction ratios Canon Macro 100mm f28 4. FOCAL LENGTH !The focal length of macro lenses: !from 50mm to 200mm!others range to 470mm 5. FOCAL LENGTH The distance from the lens to thesensor, 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 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." 7. 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. 8. 24MM 9. 35MM 10. 50MM 11. 100MM 12. 200MM 13. 400MM 14. 800MM 15. 2100MM 16. FOCAL LENGTH 17. FOCAL LENGTH 18. FOCAL LENGTH 19. FOCAL LENGTH 20. FOCAL LENGTH 21. FOCAL LENGTH 22. 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 23. 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 24. 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 25. Background Blur ComparisonSame aperture setting (f/16) and identical subject to background distances. 26. 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.