Purple flare: Causes and remedies

Started Mar 1, 2013 | Discussions thread
micksh6
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Re: Purple flare: Causes and remedies
In reply to Detail Man, Mar 2, 2013

Detail Man wrote:

With reference to the GH3, and the likely possibility that it uses the same image-sensor (but with, at least, a different and likely more "strong" AA filter), while one might (in a simplistic sense) think that a "stronger" AA filter would tend to spread incoming light even more, the composite effects of the micro-lenses and various optical filters is probably potentially far more complicated than that ...

It's the same thing that I thought. Strong AA filter spreads the light enough so if falls into different pixels at tens of microns distances.
If the light is reflected from sensor after AA filter, then falls back to the sensor after reflecting from lens rear element we are talking about centimeter distances. At such distances purple reflections would be completely diffused.
They may result very slight purple cast or loss of contrast, but it's probably so minor that nobody notices it.

So, yes, stronger AA filter should help to make flare disappear if it's a result of reflection from some surface below AA filter and a reflection from the lens. But, it is also possible that Panasonic replaced some surface in GH3 sensor with something less reflective than OM-D sensor surface.

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