One of the features I love with this camera is the super long mechanical shutter exposures you can do (up to 30 minutes) without using bulb mode or any device connected to the camera. So, I've been playing. In one image with a 4 minute exposure, I noticed a lot of 'hot pixels' in the resulting image to the point of ruining the image. So, I set up a little test.
Using a 60 second exposure, I took two images. One with Long Exposure Noise Reduction on and another off.
Crops are shown below. The first crop has Noise Reduction = Off; the second crop it is on.
1). This camera is pretty new. Is the number of hot pixels unusual? Coming from Sony, I've never seen so many which is making me wonder if my results are abnormal.
2) Using the camera's Long Reduction Noise Reduction does a great job of removing the hot pixels but of course, my overall exposure time is doubled.
Wow, that's interesting how Capture one treats the raw file versus Lightroom. In my brief experience however, using Long Exposure Noise Reduction did a pretty good job versus what the youtuber found.
For a long time the SL cameras only had mandatory LENR after every exposure longer than a second. It took a lot of convincing to have it as optional.
I have an SL2 (not SL2-S). I have yet to find a small format camera that performs really well at single frame long exposures. My A7R3 is a bit better but not much. My A7R2 was worse. My S1R is pretty much identical. I still shoot a dark frame when using 135 format cameras or engage LENR for anything over about thirty seconds. Also keeping the camera cool really helps. Big difference between winter and summer long exposures here.
By FAR the best camera/sensor on the market for long exposures is the HB X1D/X1DII. Its long exposure capabilities are miles beyond anything else on the market. It's so good it doesn't even have an option for LENR. It also exposes and meters shots up to an hour plus it has a customisable countdown timer.
The SL2-S is a sensational camera but it's still a small format. You're pushing its limitations, that's all.
Gordon
p.s. You could do a quick stuck pixel test to make sure the sensor is good.....
