Originally posted by PocketPixels I've been taking some long exposures recently with my K-S2, and I've noticed a handful of "hot" pixels. Nothing bad, nothing worrisome, just enough to get me curious.
I had thought a hot pixel was "on" all the time, but I only see these fellas get weird after 1s or longer of exposure. For a "normal" shot—1/125s, ISO 400—they appear to function normally. I had a few hot pixels in my K100D-Super, and they were always on. Mostly green pixels. One was blue, and one was orange (I didn't think sensors had actual orange pixels?). But they were always on, even at quick exposures such as 1/500s, ISO 100.
So, my question: if these pixels on my K-S2 still perform adequately for most of my shots, should I run the "Pixel Mapping" option on my K-S2? Will doing so permanently deactivate these pixels? Does Pixel Mapping have any effect on RAW capture?
Can't stress this enough, we're talking about five or six pixels on a 20MP CMOS sensor. If I ever needed to create a pixel-perfect image, it'd be the easiest Photoshop fix in the world.
For longer exposures, slow shutter speed noise reduction (aka dark frame subtraction) is generally the way to go, as some hot pixels (due to heat) will inevitably show up. Pixel mapping will help with pixels that are permanently broken, but that's a different thing.
Adam
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