I'm assuming this is a lens with some other mount other than EOS and that you're using an adapter to match it to the front of your extension tube. If so, you need to get an extension tube for that mount and fit it between the adapter and lens and not use the EOS extension tubes. The switch you're referring to tells the body that an EF lens is attached. If you look at an adapter (like a Tmount/M42, you'll see it does not activate this switch.
If, otoh, this is something in a Canon mount that is a manual lens (like a mirror lens), then I'm not sure why you're having the problem. Tom P. > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Stan Patz > Sent: Wednesday, May 10, 2006 6:57 PM > To: [email protected] > Subject: EOS extension tubes > > To the EOS group, > > I have this esoteric problem and wonder if anyone else has > solved it. I would like to use a manual lens (non Canon) on > my 1Ds with extension tubes, but the camera will not fire. > The mirror pops up and I get "ERR 01" (dirty contacts!). The > camera has to be shut down, then restarted to get the mirror > down and functioning again. > > This has little to do with the lens because just mounting an > extension tube and dry firing will produce the error. But, > once a Canon lens is mounted, the camera functions. So, > something electrical does happen to make everything OK. > > I use Kenko tubes, but I understand that the same thing > occurs with genuine Canon. I taped over the electrical > contacts on the tubes, but get the same error. Interestingly, > I can reproduce "ERR 01" by moving a hidden pin in the Canon > body, located at about 10 o'clock on the lens mount. I think > this may be the key to my problem, but hesitate to start > filing aluminum mounts just yet. > > If anyone has a solution, I am interested. > > > Stan Patz NYC * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
