Purple flare: Causes and remedies

Started Mar 1, 2013 | Discussions thread
Anders W
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Re: Purple flare: Causes and remedies
In reply to secretworld, Mar 3, 2013

secretworld wrote:

Anders,

Feel free to ignore this, but what if the non linear colour distribution is not caused by leakage etc. but by real non linearity of the sensor sensitivity (which Oly cleverly fixes normally but it gets confused by the flare). To test this you could try the same set up and under expose by a few stops (maybe from 1 to 6 stops) by means of reducing the shutter speed. Since the light is travelling in exactly the same way in all exposures if the flare suddenly turns white we know its a sensor linearity thing (or not if it stays purple also when underexposed significantly).

Sorry no Oly camera so canĀ“t try myself. I would do it right away.

The response of the E-M5 sensor is known to be linear in terms of recorded ADU-levels. See here

http://forums.dpreview.com/forums/post/41989249

and here

http://forums.dpreview.com/forums/post/50603174

Whether the underlying analog response is linear is immaterial with regard to potential color shifts.

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