05-21-2012, 12:25 PM
I was a good read, a really good read, yet it still remains unclear what causes this phenomenon...
I don't remember where here in this thread exactly, but somebody mentioned about a reflection from the sensor/film to the lens' rear element and then back... I doubt that... I think this kind of "ghosting" would show itself on any location on the image, not as a purple halo perfectly surrounding the blown highlights. Or am I missing something?...
I gave up chasing "what are the possible causes", I rather question "what cannot be the cause" <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />...
And then, I have samples to share/ask opinion. I guess the below sample is like a mixed salad (please excuse the quality of the image, but I believe it's an appropiate sample to bring in <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='
' />...). It's a 100% crop. Taken by the old 135mm CZJ Sonnar @f/3.5. The rocks look slightly OOF (maybe because it's a native M42 mount lens, which is unable to focus at infinity on Nikon). Check the blue surroundings on the left-bottom. Any ideas?... Or the purple halos all over the image, they look like BF but there are more purple halos towards the rocks (near to the in-focus area) and that confirms PF I guess...
![[Image: _SKT9812_019_NX2_sample.jpg]](http://i1172.photobucket.com/albums/r571/SerkanKet/Test%20Shots/_SKT9812_019_NX2_sample.jpg)
Another one, taken with the 28mm AiS @f/11, 100% crop from the right bottom corner... No PF, no visible other CAs, just a tad haze maybe reducing the global contrast (I believe it's a decent lens as reported <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='' />). So, what can be the reason why we don't see a PF here?
![[Image: _SKT9808_012_NX2_sample.jpg]](http://i1172.photobucket.com/albums/r571/SerkanKet/Test%20Shots/_SKT9808_012_NX2_sample.jpg)
I don't remember where here in this thread exactly, but somebody mentioned about a reflection from the sensor/film to the lens' rear element and then back... I doubt that... I think this kind of "ghosting" would show itself on any location on the image, not as a purple halo perfectly surrounding the blown highlights. Or am I missing something?...
I gave up chasing "what are the possible causes", I rather question "what cannot be the cause" <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />...And then, I have samples to share/ask opinion. I guess the below sample is like a mixed salad (please excuse the quality of the image, but I believe it's an appropiate sample to bring in <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='
' />...). It's a 100% crop. Taken by the old 135mm CZJ Sonnar @f/3.5. The rocks look slightly OOF (maybe because it's a native M42 mount lens, which is unable to focus at infinity on Nikon). Check the blue surroundings on the left-bottom. Any ideas?... Or the purple halos all over the image, they look like BF but there are more purple halos towards the rocks (near to the in-focus area) and that confirms PF I guess...Another one, taken with the 28mm AiS @f/11, 100% crop from the right bottom corner... No PF, no visible other CAs, just a tad haze maybe reducing the global contrast (I believe it's a decent lens as reported <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='
' />). So, what can be the reason why we don't see a PF here?