Internal Focusing System
Internal lens elements move, so the overall length does not change -- creating a lens that focuses more quickly and doesn’t alter its balance.
Sophisticated Multi-Element Design
16 lens elements in 13 groups correct visual aberrations across the entire zoom range and help reduce weight.
ED (Extra-low Dispersion) Glass
ED Glass lens elements minimize flare and greatly reduce chromatic aberration, giving you sharp, clear shots even at full telephoto extension.
Circular Aperture
Because aperture blades form a near circle at the wide openings used for low-light shots, spot-light sources have a pleasing circular defocused effect.
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