The Auto Extension Tube Set for Mini 4/3 (Mini Four Thirds) Lenses is a two extension tubes for mirrorless interchangeable lens cameras.This set has tubes of 10mm and 16mm. The tubes can be used individually (10mm, 16mm) or in combination (10mm+16mm) to botain the magnification.Extension tubes are hollow cylinders without optics designed to enable a camera's lens to focus closer than minimum focusing distance and therefore more magnification. They are placed between the lens and body and are particularly. They increased magnification for whatever need.An extension tube increases lens magnification by an mount to the extension distance divided by the lens length. For exmple, adding a 25mm extension tube to a 50mm lens will give a magnification gain of 0.5X. Therefore, if the lens's magnification 0.15X. then the new magnification will be 0.15X + 0.5X =0.65X.This Auto Focus Extension Tubes are designed with all the circuitry and mechanical coupling to maintain auto focus and TTL auto exposure with Mini 4/3 (-Four Thirds) lenses.Compatible CameraFor GH3 G5 GF5 GF6 GM1 GM5 G X1 GX7 GX1GK GF3GK G3 G2 GF2GK G1 GF1 G10 E-P5 E-PM E-M1 E- E-M10 E-PL5 E-PL6 E-PL7Product SpecificationLength of Tubes: 10mm, 16mmDiameter of the tube:58mmWarm NotesWhen using extension tubes the lens will not focus to . The focus range will be greatly limited to a very focusing distance.There is light fall off when using any extension tube, Sometimes the equivalent of 3 f-stops of light is lost when using multiple extension tubes together. This light lost can affect the camera's to auto focus. Manual focusing is recommended should the lens begin to "hunt" (not lock onto the subject).Material: Metalcolour: black Package Contents:1 x Auto Focus Macro Extension TubeOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.