- Retains all metering and AF functions with most CANON EF lenses
- High level water and dust resistance -- suitable for use in heavy rain
- O-ring seals protect mounts and release lever
The result of using extension tubes is that the distance from the back of the lens to the film surface is longer, which means you can take photographs at shorter distances to the subject. Extension tubes are thus commonly used for macro photography and sometimes for closeup portraits. This updated version II is now also fully compatible with Canon Digital EF-S lenses, as well as standard photo EF and TS-E lenses.