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All metal structure, with excellent opticals (4 elements/2 groups) Note: Canon EF-S lenses do not fit ! (it 's for the full-frame EF lenses only) what it does: reduce the focal length (by 0.72x wider) effectively increases the maximum aperture of the lens by 1 stop (in other words, under the same aperture, you can use faster shutter speed (by 1 stop). It can adjust the Aperture Manually what it does not: there is no electronic integration, no auto fucusing, no auto aperture Suitable for: -Canon EF Lens -All Micro 4/3 Camera Panasonic Lumix GX7 GF6 GH3 G5 GF5 GX1 GF3 G3 GH2 G2 GF2 G1 GF1 G10 Olympus OM-D E-M1 E-M5 Pen E-PL6 E-PL5 E-PM2 E-P3 E-PL3 E-PM1 E-PL2 E-PL1 E-P2 E-P1