DPReview.com is closing April 10th - Find out more

SD15 Full Spectrum (no filter) WB comparisons

Started Jul 23, 2020 | Discussions thread
tagscuderia
tagscuderia Senior Member • Posts: 1,957
Re: SD15 Full Spectrum (no filter) WB comparisons

xpatUSA wrote:

tagscuderia wrote:

xpatUSA wrote:

I'd much rather blow highlights than suffer SPP's treatment of 'under' exposed Merrill shots − so I've learned to live with SPP's rather good Highlight Control tool. But I admire your sentiment.

We should remember the "S-curve" in DPR's dynamic range graphs - where the curve at the top means that highlights may not be "blown" but they certainly can have less contrast than desired.

The 'Standard' tone curve for the SD1M, not sure what to make of that really

Doesn't look like DPR's. Here is the DPR test 'S' curve which is sRGB 8-bit luminosity versus illuminance from a step-wedge target:

That's the conversion tone curve for Standard, found in the X3F metadata i.e. the correction curve. "If" SIGMA granted us access to that, we could define our own highlight roll-off.

What are the axes of your curve proportional to?

Truth be told, no idea  0-255, 0-255?

DPR have measured Dynamic Range though, so that's the classic S-curve post the correction curve that I've linked to... ? Gosh, my brain isn't working today.

 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
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow