DP1, DP2 & DP3 color rendition: same or different? The truth revealed :)

Started Mar 29, 2013 | Discussions thread
vbd70
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Re: So really cameras are not different, Auto WB is.
In reply to Buhl213, Mar 29, 2013

Buhl213 wrote:

Kendall Helmstetter Gelner wrote:

Another good test, although I would say response between the cameras could vary from flash based light source to natural light - between your test and Bob's we all have a better idea what to expect.

Yes, but it would be lovely to see some spectral distribution of Bob's dutch grey ambient light compared to the distribution of Vieri's flash.

Vieri, you wouldn't happen to have a small-spectered light-source (like a LED-lamp or so)? And far too much time on your hands?

Well, I choose to use flash because it pretty much repeatable (more than any ambient light for sure) and because it is an "easy" light for cameras to work with.

I surely do have a LED-lamp or two around the house, but of the thin Mag-Lite kind; it is nearly impossible to illuminate a target chart decently with these...

It seems like in the end the cameras are not really different, if a custom WB yields nearly the same result across the line.  Instead for whatever reason, it's Auto WB that creates more variation... which is really good to know.

But the angle of light hitting the sensor is different - and Sigma have to find a good compromise between receiving as much light as possible on one side versus not having the circuitry of the first two layers shadow for the well at the third layer on the other side. Could this be accounting for the difference?

I hope Vieris test and Bowmans observations are flawed, of course -- otherwise I HAVE to get a DP3M )-:

True, but on the other hand the cameras are fixed-lens cameras, so Sigma could do pretty much any optimisation they cared to try, both at micro-lens level and at processing level, and fine-tune it precisely for each of the three Merrill camera. I am actually thinking about the differences in exposures that I noticed in my tests... Strangely enough, Sigma didn't do anything to compensate for this in camera; so, if you shoot the same event with more than one camera, you'll have to use different exposures for each to have matching results.

Best,

Vieri

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