D7100 'streaking'

Started Apr 7, 2013 | Discussions thread
krikman
Regular MemberPosts: 292
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Re: D7100 'streaking' - doesn't look like blooming or flare
In reply to krikman, Apr 8, 2013

Some reasoning:

ADR algorhytm works with native data (in 14-bit space?) by somehow analysing of large blocks of data, then RAW compression defines which data will cut in conversion to 12-bit, but coders forgot to cut unusable bits from precise calculations so we got rounding error in green channel.

(i.e. pixel has value 10100011, we cut last 2 binary digits '11' but they appear in each and every cell in row and add regular 0,5% for whole row)

But VERY IMPORTANT DISCOVERY:

Until ISO400 we presumable have clear raw data, but from ISO800 Nikon 'cooks' RAW data by different datapath with intensive onchip (?) NR. It is common sense but first time we had clear instrumental proving.

RAW cooking alghorhytms works at low ISO for high DR too.

That is the reason why maximum DR so low on D4 - Nikon don't touch data too much on their only pro body.

And another suggestion to test:

JUST ROTATE CAMERA 180 degrees!

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