The advantage of using extension tubes is that the distance from the back of thelens to the film surface is longer; so you can take photographs atshorter distances to the subject. Extension tubes are thus commonly used formacro photography and sometimes for close-up portraits.
When using acamera's TTL metering system, no exposure compensation is required(whereas exposure compensation is required for handheld meters). This updated II versionis now also fully compatible with Canon Digital EF-S lenses, as well as standardphoto EF and TS-E lenses.
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