06-06-2013, 01:49 PM
Well, these auto corrections are a borderline thing from a testing perspective. The MTFs are better without.
The Oly 17mm f/1.8 has a raw distortion of 4.5%. As a consequence there is simply quite a bit of stretching and interpolation going on in the border region.
Since this is enforced in MFT land, it is hard to get around this.
Interestingly CaptureOne 7 provides the uncorrected image from RAW now.
It is probably hard to tune this but I could try to provided the RAW MTFs besides the 'corrected' MTFs.
Not sure in how far this is helpful though.
The results aren't bad for the 17/1.8 but they stay way short of the 75/1.8, of course (which doesn't need any auto-correction).
The Oly 17mm f/1.8 has a raw distortion of 4.5%. As a consequence there is simply quite a bit of stretching and interpolation going on in the border region.
Since this is enforced in MFT land, it is hard to get around this.
Interestingly CaptureOne 7 provides the uncorrected image from RAW now.
It is probably hard to tune this but I could try to provided the RAW MTFs besides the 'corrected' MTFs.
Not sure in how far this is helpful though.
The results aren't bad for the 17/1.8 but they stay way short of the 75/1.8, of course (which doesn't need any auto-correction).