The Four Thirds value is a privileged information, unconfirmed officially but trusted other values are compiled from various sources. Markerink, and re-published in a more readable format with some additions by Stephen Westin.) (An extensive list of flange distances and mount sizes has been compiled by W.J. Here is a table, showing some of the values in millimeters In case of E-system cameras, we are lucky: the Four Thirds flange distance is less than for any of popular manual-focus SLRs (this is possible thanks to smaller frame and therefore mirror size). (Actually, for some camera/lens combinations you can see a disclaimer: 'suitable only for close distances'.) If not, tough: even if you could mechanically match the lens to the body, it will not focus all the way to infinity. If the lens was intended for a system with flange-back greater than that of the body on which the lens will be used, fine: the adapter thickness can provide the extra spacing. The flange-back differs from system to system. This value is often referred to as flange-back or register. The lens will focus properly only if the distance between its rear flange and the image plane (film or digital sensor) is right, i.e., the same as in the camera for which the lens was designed. This looks simple enough, but there are some limitations. Such an adapter is a short metal ring with a Four Thirds male bayonet at the rear, and the female lens mount (bayonet or screw-on) at the front. The mechanical connection can be, however, provided with use of lens adapters. Obviously, the Four Thirds standard is compatible only with the Four Thirds lenses. E-System cameras use the Four Thirds standard bayonet, providing both the mechanical coupling and the digital interface between lens and body. Using macro bellows to get really close, with examples shot with some old Exakta lenses.ДЇirst of all, the lens has to be mounted on the camera body.The 50 mm, F/1.8 Zuiko 'standard' prime lens used on E-System cameras - remarks and image comparisons.Using OM Zuiko lenses on E-1 and E-300 general remarks and John Foster's observations on a long list of lenses.My Quest article, Using Legacy Lenses on Digital SLRs, a general introduction to the subject (actually, it makes sense to read that article before this one) Here I am offering some technical background about that, as well as some practical advice. You may not be aware that most of the lenses made in the past to fit various brands of 35-mm film SLR cameras (we'll refer to them as 'film cameras' for short) can be used with E-1, E-300, E-330, and E-500 (or any other Four Thirds models which may show up in the future). My other articles related to the Olympus E-System cameras.

E system lens