Sigma USB Dock - Canon EF Mount CP-1300 DX Coded cassettes mean that

DX Coded cassettes mean that the film speed of ISO 50/18° is set automatically on most cameras

The KENKO AUTO EXTENSION TUBE SET contains three tubes of different length

It uses a glass moulded aspheric lens at the 7th element to prevent field curvature

Compatible with the Canon EOS 60D

the Glass Limo has three Modular rails for adding adding a ton of extra carrying capacity

Sigma USB Dock - Canon EF Mount CP-1300 DX Coded cassettes mean thatBy 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.