The EXIF header is numbers related to the camera and detailed shooting information imbedded into the jpeg file.

I have been shooting the comet with a Pana LZ6 at max zoom, which is f=36 mm f/4.5. The LZ6 only goes to iso400 and 15 seconds would not show much of the comet, even with a heavy dose of Photoshop. Getting useful performace at iso1600 would be nice.

Your writeup mentioned that you used a Pana FC50 camera,
35 mm focal length and 15 second exposure at iso1600. I have not found any information on a Pana FC50, but there is a FZ50, which goes from 6-60 mm. The noise level at iso1600 looks very reasonable.

I presume your shot was taken on a mount which tracks the stars.

hha