The fringing is in the sample Jpeg imbedded in the file, and in the
images rendered by both Adobe Bridge and PDCU, so if it was in the
processing it's also in the processing in the cameras Jpeg engine.
I read a reason for it being purple having to do with the fact that the
color demosaicing algorithm biasing towards the red and blue to make up
for there being two green for every red and blue pair of photo sites,
(otherwise it will bias green), it makes a certain amount of sense where
there's a sharp edge, and the highlights are at the cusp of being over
exposed. I've seen enough red/blue fringing in digital files, I've got
at least one lens where the fringing is several pixels in width. This
doesn't seem to be that at all.
On 10/6/2014 8:19 PM, Darren Addy wrote:
Well, I zoomed to the 29 minute mark. I don't think his explanation
really applies in the case of P.J.s photo because I don't think the
fringing is in front of the plane of focus. It is just around the
transition area of white (to darker). I'm sure that if Zeiss would
send P.J. an Otus 85mm for use on his K-5II he would be happy to try
to see if it makes the problem go away, however. Sadly, it is only
currently preorderable (is that a word?) for Nikon/Canon.
It is still possible that it is an artifact of post-processing.
A question for P.J.
I'm assuming, P.J. that you see it in the RAW files also, before
processing or compression?
I've seen some derogatory comments on the web about purple fringing
being an issue commonly known (as in, a given) regarding Sony sensors.
No idea if that is mularkey or not - or was possibly true at some
times and not others?
On Mon, Oct 6, 2014 at 7:06 PM, Darren Addy <[email protected]> wrote:
The first time I tried watching that video (a week or so ago) it
literally put me to sleep, in the middle.
I'll have to give it another try in the morning when I am full of caffeine.
On Mon, Oct 6, 2014 at 6:42 PM, Rob Studdert <[email protected]> wrote:
Hi Guys,
As much as I don't like Matt this video where he interviews Dr Hubert
Nasse from Zeiss contains some interesting info (and displays Matt's
ignorance of even basic optics) particularly at around 29 mins where
there is an explanation of the reason that purple fringing occurs when
using old fast optics.
https://www.youtube.com/watch?v=9cnEnRADDLo
Cheers,
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