Sony 10-18mm chromatic aberration?

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FowlersFreeTime

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What causes chromatic aberration? I did lens correction and a quick auto edit for demonstration purposes: Pixel peep the highlights for some extreme purple fringing.
Is this because I took the pictures hand-held? I'm definitely less than impressed with this f4 lens in low-light conditions; I think the Sigma 16mm would have performed better.

DSC04505.jpg DSC04506.jpg
 

Ivanturas

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Iván Fuentes Hagar
Chromatic aberration occurs due to light being diffracted unevenly along different wavelenghts. That means some frequencies will hit the sensor on different spots, although they actually originated from the same place.

Wide angle lenses tend to be more prone to this, especially the closest you get to the borders, due to obvious reasons. Also, different apertures will provide different results, the more elements your lens has, the more chances you get to acquiring aberration, and that also brings us last but not least, zoom lenses also raise the stakes.

Aberration is quite easy to correct in post, though... especially if shooting RAW, and even more if you have your lens profile loaded, since the it becomes a matter of just "realigning" channels the proper way, in the proper spots.
 

tcoquelin

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It looks like LCA (longitudinal chromatic aberration). You can think of it as bokeh fringing. If you take the same picture at f8, the purple fringe should almost disappear
Edit after zooming in more:
I looks more like TCA (transversal chromatic aberration), so closing the lens more should not make any difference. They can be automatically and efficiently fixed in post.
 
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FowlersFreeTime

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Chromatic aberration occurs due to light being diffracted unevenly along different wavelenghts. That means some frequencies will hit the sensor on different spots, although they actually originated from the same place.

Wide angle lenses tend to be more prone to this, especially the closest you get to the borders, due to obvious reasons. Also, different apertures will provide different results, the more elements your lens has, the more chances you get to acquiring aberration, and that also brings us last but not least, zoom lenses also raise the stakes.

Aberration is quite easy to correct in post, though... especially if shooting RAW, and even more if you have your lens profile loaded, since the it becomes a matter of just "realigning" channels the proper way, in the proper spots.
I did the lens correction and CA reduction in Adobe, what you're seeing is after that! Crazy right?
 

FowlersFreeTime

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It looks like LCA (longitudinal chromatic aberration). You can think of it as bokeh fringing. If you take the same picture at f8, the purple fringe should almost disappear
I wish I had a tripod at the time, I would have used f8 and a longer exposure for sure.
 

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