creanzworld wrote in post #16592692
Not really familiar with that function. Can it get rid of the few hot pixels?
Long Exposure Noise Reduction is what you're chasing.
Basically - it takes a normal photo, and then it takes a second photo without opening up the shutter immediately after. It subtracts any light it sees in the second photo from the first photo, so should significantly reduce the amount of hot pixels you see.
Getting your fair share of hot pixels on long exposures (esp with higher ISO) is expected, which is why the camera's come with this built in feature.
Also sorry to change the subject, but i have another question. This i also noticed recently with the long exposure at night. For nighttime long exposures in the past, i used a Canon 17-85mm f/4-5.6, and before that, a 18-55. Both gave pretty good pictures while using low ISO and about 20-30secs was great for a bright, night sky. My 50mm 1.8 is also fantastic obviously due to the wide aperture. However, ironically, my Sigma 17-70 2.8 is terrible. Im sure its a setting on the camera that i mistakenly pushed. I mean its at 2.8 (more than enough light to come in the lens) and it was at 30secs at 200iso. Even at those settings, the sky should be adequately bright; but the night sky was terribly dim. My 18-55 did better, ha. So is there some custom function i might've turned on or something which is preventing me from getting a brightly lit up night sky?
Sorry - you must start a new thread for a new question, lest this one goes off topic.
Did you leave a filter on your Sigma. (I've been known to have accidently done silly things like that, leaving CPL's on and stuff for night photography before. .