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File request: SD14 Full Spectrum X3F

Started Feb 3, 2021 | Discussions thread
tagscuderia
OP tagscuderia Senior Member • Posts: 1,957
Re: File request: SD14 Full Spectrum X3F

Unfortunately I can't correlate the SD15's custom matrix with the SD1M, I'm going to guess that it's the AFE so again, if anybody has a relevant SD14/F13 X3F it'd be greatly appreciated!

What I'm interested in:

SD1M CustomWBGain:1.320313;1;0.6445313

CustomCCMatrix:

R=2.875;-1.71875; 0.9921875

G=-3.15625; 3.851563;-4.648438

B= 1.28125;-1.132813; 4.65625

SD15 CustomWBGain:0.996094;1.25391;1.48047

CustomCCMatrix:

R=3.42188;-2;1.01563

G=-3.375;4.32813;-3.99219

B=0.953125;-1.32813;3.97656

Differences between the 2 were expected and wanted of course, with the SD1M CustomWB captured from a non IR reflective grey card vs the SD15's against vegetation, but the 2 don't play well... at all, in any combination.

Why do I think that it may be possible in the first place?* More hope than anything, but Foveon have published repeatable spectral responses, so it's possible that they haven't significantly altered the photodiode depth between generations. I'll have to compare Sunlight WBGain from F13 and F20 sensors to corroborate that though (possibly should have started there!!).

*WBGain is applied after the conversion to RGB, with Merrill RAW data already being RGB, so that is one less headache! And the gain won't be interchangeable of course without some modification.

 tagscuderia's gear list:tagscuderia's gear list
Sigma DP3 Merrill Sigma SD1 Merrill Sigma 15mm F2.8 EX DG Diagonal Fisheye Sigma 18-35mm F1.8 DC HSM Art Sigma 50-100mm F1.8 DC HSM Art
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