0.72x Focal Reducer Speed Booster Adapter for M42 screw lens to Micro 4/3 MFT - Olympus OM-D Panasonic GH5

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0.72x optical glass lens adapter for using Micro Four Thirds (m4/3) mount digital cameras with M42 mount (42mm x 1.0) lenses. (Optional M39-M42 adapter ring for M39 lens) 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