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Mescalamba lives in the "Alternative Gear & Lenses" forum. Of course he is going to say that Nikon cameras and lens don't produce good color. Mainstream products are inferior, didn't you know that?
Heh, no.. not really. There are some "fringe" cams that produced amazing colors, but there are some good ones among regular cams too.
From "almost current" Nikon lineup D300 (with custom ICC) and D700.
Similar from Canon 1DsMK3 and 1DMK3. Both pretty much as good as possible. Yes better than Nikon, sorry..
Sony A900,A77,A99. A900 is best. A900 is actually probably best for colors, but there are few problems. One of them is AA which kills micro-contrast, kinda stupid when they have Zeiss AF lens.. Another that most ppl today probably dont prefer camera without LV. And high ISO isnt exactly great..
Now that fringe part..
Best colors of all times, are probably from Kodak 645 back. Closely followed by similar tech inside of SLR/n and SLR/c. I wont list all downsides, cause it would be incredibly long list..
Otherwise there is Konica Minolta 7D and Fuji S5 Pro. Which are probably not "best" just pretty interesting from color point of view.
For regular use I would stick with normal ones - D700 or 1DsMK3 or 1DMK3 (if you are ok with APS-H). Color profiling is pretty much must, if you want to get maximum..
And lens? Well, Nikkors are good (actually prefer those older ones over new sometimes). Canon bit less, few L lens are nice and most of telephotos are pretty good. For example 85mm f1.2L is very nice..
If you want "best" you need bit fringe solutions, including Zeiss/Leica. But funny part is that as far as colors go, best color transfer is from.. tadaa.. Samyang. If you use their lens, you will see how good colors are coming from your camera, cause their lens pretty much dont have any color footprint on image. Which on other hand makes it a bit dull to use. Voigtlaender (Cosina) are quite similar to Samyang, pretty neutral colors too.
Most lens have some "personality" cause it transfer some colors better than others or even shift colors (old C/Y Zeiss for example). Which is why Canon looks like Canon and Nikon like Nikon.. If you use some Nikkor lens on for example 1DsMK3 you will see colors that dont look like Canon ones..
Its possible to negate some of these "problems" by making color profiles..
Good colors dont need to be accurate or real. So pretty much anything can do them. Those I mentioned are different from others cause they can give you "more" colors. Simply they can distinguish more colors then rest. Which is value that cant be replaced by anything as its fixed feature of sensor based on quality of CFA.
Colors of photo are mixture of camera + lens + profiles used (or.. in case of most ppl its based on which RAW converter was used as most ppl dont make own color profiles). If you try most RAW converters on market (or free ones), you will see that it has huge impact on colors as every converter has own color profiles for your camera. Which is good reason to pick one converter you like and make own profiles for it, matching gear you actually have.