I think that a problem exists.
I have been testing a few leica r lenses on the nex 7, and particularly on the
elmarit 19 II and elmarit 35 I noticed soft borders and corners.
Those lenses are retrofocus design, and should be perfectly compatible with
the nex so at beginning I attributed the fault to the lenses.
I was planning to use the lenses on a (still unavailable) d800, so I borrowed
a D700 to see if the problem persisted with this camera also.
To my surprise, and in particular the elmarit 19, the leicas were quite sharp
on the whole field at infinity.
The following test seems to indicate strong field curvature at the lateral borders
of the nex7 sensor.
Full image on d700, elmarit 19- f5,6-infinity focus
DSC_6231 by
sergio lovisolo, on Flickr
D700 crop
DSC_6231a by
sergio lovisolo, on Flickr
nex 7 full image elmarit 19-f5,6-infinity
_DSC0852 by
sergio lovisolo,
on Flickr
nex 7 crop
_DSC0852a by
sergio lovisolo, on Flickr
It seems to me that while the crop from the d700 is out of focus as correct,for
a shot taken at infinity, the crop from the same image area with the nex7 is in full focus while in other shots with all image at infinity that same area is soft.
Note that apparently the same image taken with the kit lens at 19 on the same
conditions is out of focus in correspondence of the crop.
Suspects?
Sergio
a