Mark Bohrer <lurchl@xxxxxxxxxxxxx> wrote: > The Canon 2X I use is the APO model, with either EOS 1D mark II or 20D. > I don't use either 400mm f/4 DO IS or 500mm f/4L IS wide open with the EF > 2X II because the image quality is usually pretty marginal. There's a reason some people shell out the bucks for the Leica stuff ... my tests of the Leica 2x APO show a small loss of image quality with most lenses, the sole exception being a non-Leica lens, which had a more significant loss. Doug Herr Birdman of Sacramento http://www.wildlightphoto.com ========================================================= To Unsubscribe: Send email to leica-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field. The acknowledgment that you then receive MUST be replied to per instructions. You may also log in to the Web interface to unsubscribe.