Component for: SLR Macro lens Black Lens structure (elements/groups): 14/12 Maximum aperture number: 32 Closest focusing distance: 0.48 m Features- Focal length and maximum aperture: 180 mm 1:3.5 - Lens construction: 14 elements in 12 groups - Diagonal angle of view: 13°- 46° - Focus adjustment: Inner focusing system with USM - Closest focusing distance: 0.48m / 1.6ft - Filter size: 72mm Life-size close-ups can be taken from a farther distance without disturbing the subject (insects, etc ...)Another telephoto macro lens with a maximum magnification of 1x. Life-size close-ups can be taken from a farther distance without disturbing the subject (insects, etc). The internal floating system minimizes fluctuations in aberrations caused by changes in the focusing distance. The delineation is therefore razor sharp from 1x to infinity. Lens system Minimum aperture number 3.5 Closest focusing distance 0.48 m Maximum aperture number 32 Number of diaphragm blades 8 Lens mount interface Canon EF Le