Archived posting to the Leica Users Group, 1997/07/02
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 06:56 02/07/97 -0400, you wrote: >On Wed, 2 Jul 1997, Kari Eloranta wrote: >> Martin Tai wrote: >> >On the contrary, the only way to get best optical performance >> >is UNIT FOCUSING, ie, move the lens as a whole. The internal focusing >> >> I'm quite sure this is false. For example <snip> >> Kari Eloranta > > Wrong ! > None of Leica's macro lenses, Macro-Elmarit 60/2.8, APO-MACRO-ELMARIT >100/2.8 Macro-Elmarit-R 100/4 use floating element design at all. > Variable spacing focusing ( internal focusing ) is widely used >in Japanese designs, not favoured by Leica >martin tai The original statement- that the only way to get best optical peformance is unit focusing, ie moving the lens as a whole, may be a bit of an over-generalisation. Even if Leica do appear to follow that principle themselves, they are not the only high quality German lens manufacturer. I did read that the new 40mm Distagon used on the Hasselblad and Rollei 6000 series has a floating element that requires the user to adjust it, and that this lens is said to have better performance than the earlier unit-focusing-only version. Joe Berenbaum