01-11-2011, 01:57 PM
[quote name='turboman' timestamp='1294751912' post='5418']
I understand this. That is why I cannot explain the obervations I made, repeated here again:
- Zeiss data (only lens) show same resolution in corner for 4/3 sensor size.
- Photozone (lens Zeiss + NEX-5 sensor)show much lower corner resolution.
Simplistic conclusion would be that NEX-5 sensor has low corner resolution.
But this is contradicted by a high resolution of Leica45Elamrit+NEX5sensor. It is unlikely that the Elmarit could correct the "simplistically perceived low NEX5 corner resolution".
Am I digging too deep?
[/quote]
MTF curves are dependent on a certain target frequency. The manufacturer MTFs have surely a different frequency than the ones in the tests. You may also notice that some manufacturer MTFs have no strict downward trend - they may have local peaks. This may also explain the difference between the MFT and NEX test due to the different sensor size and consequently different test zones. However, I don't really see that the results are so different when looking at the center and border data only actually. We haven't tested the corners on the NEX. That said I would have expected a more even center-to-corner behavior - agreed.
The Leica 45 is a dedicated design for MFT and it's slower which makes things much easier for the designers.
I understand this. That is why I cannot explain the obervations I made, repeated here again:
- Zeiss data (only lens) show same resolution in corner for 4/3 sensor size.
- Photozone (lens Zeiss + NEX-5 sensor)show much lower corner resolution.
Simplistic conclusion would be that NEX-5 sensor has low corner resolution.
But this is contradicted by a high resolution of Leica45Elamrit+NEX5sensor. It is unlikely that the Elmarit could correct the "simplistically perceived low NEX5 corner resolution".
Am I digging too deep?
[/quote]
MTF curves are dependent on a certain target frequency. The manufacturer MTFs have surely a different frequency than the ones in the tests. You may also notice that some manufacturer MTFs have no strict downward trend - they may have local peaks. This may also explain the difference between the MFT and NEX test due to the different sensor size and consequently different test zones. However, I don't really see that the results are so different when looking at the center and border data only actually. We haven't tested the corners on the NEX. That said I would have expected a more even center-to-corner behavior - agreed.
The Leica 45 is a dedicated design for MFT and it's slower which makes things much easier for the designers.