Archived posting to the Leica Users Group, 1997/07/02
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]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 Kari Eloranta wrote >I'm quite sure this is false. For example macros are specialized >designs for short distances that can be outperformed at infinity. >And obviously viceversa. Macros don't exist only because some people >like to get real close, like two inches. Their imageplane flatness etc. >characteristics etc. are already superior at half a meter which is >within the distance scale of a SLR normal lens. If your argument would >be true, a good, fixed, optical formula would work uniformly well at >all distances (that the lens focuses) which is not true. >I'm not saying that the Contax design is bad, not at all. In particular >it allows the user to switch off the AF and do the focusing manually >with floating elements AND with a tight lens. But to me it seems that >this type of AF in actual use sacrifices some of the optical potential >of the lens. = I fully support this. I don't need AF in the R8 if it work in the Contax way. I will prefer then only a good focus confirmation and pay (much) less. Lucien BELGIUM