200-500mm F2.8 APO EX DG
- First 500mm ultra telephoto zoom lens with F2.8 aperture
- Expand range to 400-1000mm F5.6 with included attachment
- Drop-in 72mm filter holder
- Dedicated Li-ion battery (BP-21) to power zoom and AF operation
- Built-in LCD panel displays focusing distance and focal length
- ELD and SLD elements minimize all types of aberrations
- Super Multi-Layer Coating reduces flare and ghosting
LENS CONSTRUCTION
- ELD glass
- SLD glass
MTF CHART
The MTF (Modulation Transfer Function) is one of the measurements for evaluating a lens' performance, and it shows how faithfully the contrast of the subject can be reproduced on the image plane. The horizontal axis shows the image height (distance from the center of the image in mm) and the vertical axis shows the contrast value (maximum value is 1).
The closer the 10 line pairs/mm curve is to 1, the higher the contrast and clarity of the lens is, and similarly, the closer the 30 line pairs/mm curve is to 1, the better the resolution and sharpness of the lens is.
*The MTF chart depicts the result at the wide-open aperture.
*For mirrorless lenses that support distortion correction, the horizontal axis shows the image height equivalent to when an L-Mount lens is attached to a Sigma L-Mount camera with distortion correction applied. (The effect of distortion correction may differ depending on the mount and camera used.)
*The spatial frequency indicates the variation on the image plane before distortion correction is performed.
Spatial Frequency
S: Sagittal Line
M: Meridional Line
10lp/mm
30lp/mm
DIFFRACTION MTF 200MM
DIFFRACTION MTF 500MM
DIFFRACTION MTF 400mm
DIFFRACTION MTF 1000mm
