Well-designed aspherical elements have been used in this new lens to eliminate chromatic aberration and reduce overall lens size and weight. This lens is even smaller than a smartphone. When used on cameras or other setups, the overall weight remains favourable. This item is sold as seen for spares or repair. Please read the description in full before purchasing. Spares and repairs items do not come with a warranty but do represent potentially excellent value. All faults or issues are fully described. Please Note: The aperture blades are jammed and will not fully stop down. The coupler linking the blade mechanism to the aperture ring is also bent out of shape.