Re: FM Test: Leica 50/1.4 Lux vs Voigtlander 50/1.2 Nokton vs 50/2 APO
hmzimelka wrote: Fred Miranda wrote: hmzimelka wrote: Fred Miranda wrote: Field curvature shape comparison:
Voigtlander 50mm f/1.2 Nokton vs Leica 50mm f/1.4 Lux (Tested on the Leica M10-R with both lenses wide open)
Leica 50mm f/1.4 Lux:
The field curvature shape is inwards where the corners benefit from focusing closer than infinity.
So, if I set the lens to the infinity hard stop, center and mid-field will be optimal while the corners will look strong if I focus at tad before infinity. When using the latter focus technique, even the extreme corners are strong from wide open!
Here are some crops demonstrating this:
Fred, is it not field curvature that's running slightly outwards at the corners?
If the corners are sharp at infinity with focusing slightly before the infinity hard stop, that means field curvature is moving outward (further away) at the corners.
Yes,
It's field curvature.
Fred, I was probably not very clear... you said its inwards running FC.
By the samples you posted should it not be outward running field curvature seeing its sharper when rotating focusing ring closer for the edges?
No, think of it this way. The center and edges are optimally focussed at 2,000 M (i.e., the infinity stop), but the corners are optimally focussed just at little closer at 1,000 M (i.e., a tad before the infinity stop). This is mild inward field curvature.
I'm sure those numbers are exactly correct, but they should suffice to illustrate how the pattern Fred has shown is inward field curvature.
Sep 10, 2022 at 05:24 PM
Previous versions of Steve Spencer's message #16041216 « Leica 50/1.4 Lux vs Voigtlander 50/1.2 Nokton vs 50/2 APO »
