Sigma USB Dock - Canon EF Mount Brand_Sennheiser PowerShot SX40 HS

PowerShot SX40 HS

Additionally

This breakthrough pigment ink technology also makes it the perfect choice for professional neutral and toned black and white prints with higher density levels and virtually no metamerism

The overall result is excellent corner-to-corner sharpness even with the aperture wide open

Sigma USB Dock - Canon EF Mount Brand_Sennheiser PowerShot SX40 HSBy connecting the USB cable to a computer, SIGMA USB DOCK enables photographers to update the lens firmware and adjust parameters such as focus. The adjustment is processed with special software (SIGMA Optimization Pro). The AF speed, focus limiter and OS function are also customizable for Sports lenses.