08-13-2011, 12:25 PM
(This post was last modified: 08-13-2011, 12:26 PM by Brightcolours.)
[quote name='PuxaVida' timestamp='1313237796' post='10734']
Hmmm... can we say that 1* optical score is deserved by this lens because it's sharp at the center of the frame?
I want to clarify the 1* optical score criteria, because I have the feeling that this one will be a case study and will not be forgotten easily <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='
' />...
Serkan
[/quote]
Come on, just look at the corner measurements, which are without precedent in the photozone test regime.
That is what photozone tests, vignetting with JPEG, distortion uncorrected by software, CA as seen by the measurement software and MTF scores in center, edge, and when warranted extreme edge.
And if a lens underwhelms in an area where it does not matter much, they add a score for how it performs in the field. Case in point: the very wide aperture Canon EF 50mm f1.2 L USM. Underwhelms in the measurements, but is quite a special performer.
I don't think one can really argue in all fairness that with an ultra wide zoom, the corners do not really matter?
Sure, one can argue that one wants to test for other criteria. And one is welcome to do so. But it is known what criteria photozone tests for.
Hmmm... can we say that 1* optical score is deserved by this lens because it's sharp at the center of the frame?
I want to clarify the 1* optical score criteria, because I have the feeling that this one will be a case study and will not be forgotten easily <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='
' />...Serkan
[/quote]
Come on, just look at the corner measurements, which are without precedent in the photozone test regime.
That is what photozone tests, vignetting with JPEG, distortion uncorrected by software, CA as seen by the measurement software and MTF scores in center, edge, and when warranted extreme edge.
And if a lens underwhelms in an area where it does not matter much, they add a score for how it performs in the field. Case in point: the very wide aperture Canon EF 50mm f1.2 L USM. Underwhelms in the measurements, but is quite a special performer.
I don't think one can really argue in all fairness that with an ultra wide zoom, the corners do not really matter?
Sure, one can argue that one wants to test for other criteria. And one is welcome to do so. But it is known what criteria photozone tests for.