Kenko Auto Extension Tube Set DG for Canon EOS Lenses PENTAXSN the lens provides the equivalent

the lens provides the equivalent field of view of a 300mm lens in the 35mm format

FUJIFILM GF 1

beautiful bokeh through careful control at both the design and manufacturing stages

Additionally

This design also contributes to a marked reduction of astigmatism and promotes edge-to-edge sharpness throughout the aperture range

Kenko Auto Extension Tube Set DG for Canon EOS Lenses PENTAXSN the lens provides the equivalentThe Auto Extension Tube Set DG for Canon EOS Lenses from Kenko contains three tubes of different lengths 12mm, 20mm, and 36mm which can be used individually or in any combination to obtain the desired magnification. They are compatible with Canon EF and EFS lenses. Extension tubes are designed to enable a lens to focus closer than its normal minimum focusing distance. They have the effect of magnifying your subject and are useful for macro