Archived posting to the Leica Users Group, 2002/11/20
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]on 11/20/02 12:05 AM, Henry Ting at henryting10@yahoo.com wrote: > > I have an old 1:1 adaptor dedicated for the old R 100 > f4 macro lens. But the aperature ring on the adpator > only turns to f4. > My question is, considering that one would never use > f2.8 in conjunction with the 1:1 adaptor due to > shallow DOF, could this old adaptor be used for the > new APO 100 2.8 ? > The f/4 position on the aperture ring of the adapter tells the SL/SL2 and R meter that the lens is at full aperture - nothing more. From this perspective there's nothing wrong with using the adapter on any lens. Of course the aperture readout in the viewfinder will be incorrect if the lens isn't f/4 to begin with. There are other considerations, though. If this adapter is anything like the 14198 dedicated 1:1 adapter for the 60mm macro lens (and I suspect it is) the adapter has a mechanical lock-out that prevents any lens other than the 100 f/4 from being used. Doug Herr Birdman of Sacramento http://www.wildlightphoto.com - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html