Originally posted by beholder3 Yes, the 100 ISO is not related to the last shot. The previous shots in this thread are at a lot higher ISO. That is what I was referring to.
If they were shot at the exact same conditions and if they are viewed at the same size, the should be about same. If you compare at 100% view, the K-1 should show x36/24 as much chroma noise. But that assumes the sensor heat-up is the same, which can be a totally different one due to construction.
As already noted: We currently can't see the actual sensor temperature, like we can on a K-3.
Cheers, I get you with some of the earlier examples.
I'm just looking carefully at my K-1 and K-3 images again here, based on a quick (lens-cap on) test in the house this afternoon. Both cameras adjacent to each other in a dark bag. Chroma is only visible
at all where the images have been pushed to specifically
exaggerate the problem (e.g. by seriously increasing highlights or clarity on the frame).
That said, while the K-3 has a more significant noise-floor across the frame, there is certainly a higher number of more intense chroma speckles on K-1 than K-3 at 30 seconds ISO 100. (note again - while I say 'more intense', these are only visible
at all with very significant processing of the file). By the way, It seems on the K-1 that that long exposure NR doesn't help with these. Also that this is a non-issue for shorter exposures at base ISO. And I didn't notice the problem being worse in the field with higher ISOs (e.g. 1600).
So, on my body it is a subtle effect that can be seriously exaggerated by the 'perfect storm' of extreme processing we have seen from some posters here. I would say for me, at ISO 100, for critical long-exposure low light photography it's something to be aware of, and can be worked around by sensible processing. Not a show stopper!
But is it really right that I should be seeing this? I recognise that there will be differences in sensor performance and noise characteristics between different bodies. That is normal. But I am a little surprised by these findings, I kind of hoped that 30 seconds, ISO 100 on K-1 would be more free from chroma than this. And I wonder if D810 is better, following the 'fix'?
The clear work-around is to be careful with highlight adjustment and clarity on long-exposure images with dark areas in them. Or to employ a processing strategy that doesn't just apply the same boosts across the entire frame. But that is normal for any critical processing of low-light photography I'd say.
John