02-19-2020, 08:26 PM
AF is "lossy" as far as optical performance goes. ;-)
The problem is that the focus group tends to be smaller and more light-weight in order to allow fast AF operations.
And the centering is, on the average, worse because you can't design the focus group as tight as on manual focus lenses.
Just look at the focus mechanism of the 110mm. Doing this kind of extension with this amount of glass is surely challenging.
https://fdirect.eu/wp-content/uploads/2019/03/6.png
That all being said - I suspect that the Nokton has, once again, no electronic coupling - and that's something that not necessary for a manufacturer who is that long in this business.
The problem is that the focus group tends to be smaller and more light-weight in order to allow fast AF operations.
And the centering is, on the average, worse because you can't design the focus group as tight as on manual focus lenses.
Just look at the focus mechanism of the 110mm. Doing this kind of extension with this amount of glass is surely challenging.
https://fdirect.eu/wp-content/uploads/2019/03/6.png
That all being said - I suspect that the Nokton has, once again, no electronic coupling - and that's something that not necessary for a manufacturer who is that long in this business.
Chief Editor - opticallimits.com
Doing all things Canon, MFT, Sony and Fuji
Doing all things Canon, MFT, Sony and Fuji