Originally posted by luftfluss Have you seen
this thread?
I just glanced quickly at it, so can't summarize.
Yes I've been there.. it is a rather large and winding thread... page 11 (IIRC) shows there was a dark band issue at the top of some sensors (or would that be bottom since the image is flipped?). My K-1 doesn't have that issue. It does seem to have the white dots though.. but there doesn't seem to be a hard rule on what is considered OK white dot level and what is considered BAD white dot level.
When I take a shot at 25600 in a dark setting and enable NR, LR removes the color noise pretty nicely and I'm left with the white dots. Hmmm..
---------- Post added 03-06-17 at 09:43 PM ----------
Originally posted by jpzk Maybe that is the culprit ?
I still have my old K5 and also being told (from what I am reading on the K-1) that the K-1 beats the K5 in that aspect (noise).
That is only a guess but maybe the very long exposure has something to do with it?
Noooo! please don't go there.. in the thread, that luftfluss linked, several people go several times around the horn over that until someone is called a troll.. Don't want it to get unfriendly like that here.
Long exposures are something I tend to do with large NDFs (10 sometimes 13 stops) so clean output is rather important.. I had this issue with the K-5 II (with hot pixels in general when shooting long exposures) but never with white dots like this. This is a K-1 'trait' it seems.. They seem so scattered and random too so I'm not sure of a way to mitigate it.
From what I gathered in that other thread, The D810 also had a similar issue early on and the issue was sensor calibration of some sort that needed to be performed. But yet in that same thread some are saying a 'few' white dots are fine.. but there aren't any (that I saw) examples of acceptable level vs unacceptable level.