Archived posting to the Leica Users Group, 2003/02/14
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]> I'm sure this has been covered but why would you test a lenses/bodys focus > using a wide angle @ infinity? Wouldn't you want to use a tele @ the minimum > focusing distance ??????????????????????????????????????????? > You want to do the test at infinity rather than a close focus distance in order to test the lens/body compatibility independantly of the rangefinder adjustments. Rangefinders in RF cameras easily get out of adjustment if the camera is banged, and this won't play a part in the test if you do it at infinity. You want the widest aperature lens you have in order to minimise the depth of focus (i.e. depth of field inside the camera at the film plane). Focal length doesn't matter, contarary to what is often written on this list. Best lens for this test is a Noctlux. - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html