0.72x Focal Reducer Speed Booster Adapter with external aperture for Canon EOS EF lens to Micro 4/3 MFT - OM-D GH4

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0.72x optical glass lens adapter for using Micro Four Thirds (m4/3) mount digital cameras with Canon EOS EF mount lenses.With external aperture blades, helps to control aperture si ze.(Electronic functions are disabled, cannot be used on EF-S lens.) Not suitable for several video M4/3 mount cameras.Please be aware of the rear part to prevent collision on camera body. Reduces focal length to 0.72, adjust the image size to near 1:1, so that the focal length of the image is close to 1.5x crop factor, e.g. 50mm x 2.0 x 0.72 = 72mm. Helps to increase the maximum aperture to 1 stop, also can use it faster by 1 stop. Switching camera to "Shoot without lens" mode is essential for several Panasonic cameras.Allows focus infinity.Blue spot will occur if lens is shot to sunlight or lamp directly.With front and rear caps. Show more