Is there time for an interchangeable sensor DSLR?

Started Oct 19, 2012 | Discussions thread
lovEU Veteran Member • Posts: 3,135
Re: More B&W and IR...

Joseph S Wisniewski wrote:

The CFA reduces DR

Actually, it increases it by 1-2 stops.

Interesting.  It still strikes me as counterintuitive since I gain DR by suppressing the blue and green channels with a magenta filter.

Struck me that way, too. The magenta filter trick (Bernes and Taplin, I go back a long way with this sort of stuff) actually decreases dynamic range. It also decreases the workload on the software, because all the channels tend to blow at the same time, so the algorithms that reconstruct a blown channel from the remaining ones don't cut in as often.

I don't understand how "The magenta filter trick (...) actually decreases dynamic range." Not sure if Iliah would agree on this.

", ... because all the channels tend to blow at the same time, so the algorithms that reconstruct a blown channel from the remaining ones don't cut in as often"

This is true, obviously. But doesn't it only mean one has to watch out even more than usual not to overexpose a shot when using a magenta filter (in cases where the green channel is fairly ahead of the other channels)?

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regards, eric

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