Hello fellow CS-ers,
Found this weird problem last night as I was fooling with long exposures last night with my D90. Below is a 100% crop of the problematic picture.
Taken at ISO 100 (LO 0.3) and exposure was 750+ seconds. Long exposure noise reduction was turned on, but the battery died as it was still doing the dark frame noise reduction (probably 1-2 minutes from completion though)
From what I have seen elsewhere, these seem to be hot pixels. I was wondering if any of the below is causing it:
a) I've been taking 30s to 5 mins exposures prior to this for probably for 1 hr and 20 mins almost consecutively (all with long exposure NR turned ON). Is this why the pixels got warmed up?
b) The incomplete noise reduction is causing this?
c) Sensor is screwed up?
Anyway I tested it again this morning. Lens cap on, ISO 3200 1/4s; then ISO 100 for ~300s. No noticeable dead/hot pixels seems to be apparent from camera screen.