If you have a SLR camera and adapter rings, make a photocopy knizhnoi articles, magazine pages, or other reproductions not accounting for labor. However, the camera “Zenit-GP” with lens “Industar-50” for it is not very convenient: it is not easy to find him adapter rings with thread M39. 1, and make them very difficult. But, it turns out, to change the focal length of this device is possible without transition rings. Remove the lens and then unscrewing the four screws (3),— fpanel (1), on which the fastened to the vessel body (2). Turning the flange by the other side, again secure it in place with screws and screw in the lens. Now focal length will allow you to take pictures with 0.35 m, which is sufficient for reproduction.