Archived posting to the Leica Users Group, 2000/03/02
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I have understood, from some perhaps mythological source in my past that while lesser lenses such as Tamron use APO designation when one of their lenses meets APO qualifications as some focal length and some F/stop and some focusing distance. With Leica lenses the APO designation means at all focal lengths, apertures and focus distances. I assume the APO becomes more important the larger the aperture (deep DOF masks non-APO qualities??) donal __________ Donal Philby San Diego www.donalphilby.com