Sigma DP1/DP2/DP3 Merrill flare comparison

Started May 26, 2013 | Discussions thread
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Roland Karlsson
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Re: Thanks Robert,
In reply to nick_webster, May 26, 2013

nick_webster wrote:

I did take a couple with the sun just out of frame and without the lens hood and they looked OK so it might just be when there is a bright light source actually in the frame.

Yes, the red spots only appear if there is a bright light within the actual frame.

And ... its not really flare. At least not lens flare.

The mechanism is something like this.

The image of the sun (or a bright street light) is focussed on the sensor. The sensor consists of a grid of pixels, including metal connections and also micro lenses, parts that are highly reflective.

The image of this grid is reflected back to the lens. And in the lens its reflected back to the sensor.

What's surprising is that the grid image is so large. We have tried to explain that, but ... not really with 100% success.

 Roland Karlsson's gear list:Roland Karlsson's gear list
Sigma DP3 Merrill Sigma dp2 Quattro Sony Cyber-shot DSC-RX100 III Pentax K-3 Pentax smc DA 15mm F4 ED AL Limited +8 more
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