I need some input from gurus here. I understand hot pixel are inevitable when it comes to long exposures, but what level of it is consider normal? I've started to take long exposures (~5 mins iso400-800) on my k-5 for my study project. I noticed that there hot pixel which are normal but what gets me wondering/worrying is that aside from the scattered hot pixels, i would have a obvious cluster of hot ('hotter' if i may say haha) in the center region of the photo. at the moment i'm unable to post the photo due to t&c of my project. i would try to take some blank photos soon.
My question is, is the cluster normal or is it something i should send to have it looked at? anyone could share their raw long exposure shots? thanks