Well done!!.. Jamby..
Has a lot of grain in the picture when setting 1600 (in dark area)??..
I find too many grain when aim setting at 1000 and up not understand it's the problem from camera or lense or both, Do you??
which is why the camera makes the dark frame i guess, you have to set NR Noise reduction in your camera settings when shooting above 400. ..or Long Exposure NR On...this is the result..please see my caption...
Yep, may be impossible that aim not set NR. I'll setting and test in night shot again. When i found this proublem aim always use filter in photoshop for solve.
Thank you so much my friend... :))