09-27-2010, 08:51 PM
[quote name='HarryLally' timestamp='1285616796' post='3300']
<Many thanks Klaus. I wasn't aware of that. Is there any reason why the Sony version of the lens is not available in Canon and Nikon mount?
Michael
[/quote]
I guess the ZF/ZE is a "classic" design - the number of elements/groups is identical to the old Carl-Zeiss 85mm f/1.4 in C/Y mount - possibly a little improved.
The ZA is probably a brand new design. Remember that AF lenses have a different focus group design which needs to be more light-weight in order to be driven by a AF motor. In THEORY a higher number of elements allows a better correction of aberrations (optical defects).
<Many thanks Klaus. I wasn't aware of that. Is there any reason why the Sony version of the lens is not available in Canon and Nikon mount?
Michael
[/quote]
I guess the ZF/ZE is a "classic" design - the number of elements/groups is identical to the old Carl-Zeiss 85mm f/1.4 in C/Y mount - possibly a little improved.
The ZA is probably a brand new design. Remember that AF lenses have a different focus group design which needs to be more light-weight in order to be driven by a AF motor. In THEORY a higher number of elements allows a better correction of aberrations (optical defects).