Reviewing one of the folders of images that I took in La Palma I came across this one that I’d stacked, mis-labelled and forgotton about. Once I started to look at it a little closer I realised that the stars were very misshapen with ones at the bottom of the frame appearing as small eclipsed disks. Vignettting was also very pronounced and uneven. Checking the focal length revealed it was taken with the Canon 18-55mm kit lens. I really must replace this lens at the first opportunity!
This is a severely cropped version of the image, showing the area from the clusters M6 & M7 at the right to nebulae M20 & M21 at the left.
10 90 second frames at ISO 800 with the Canon 350D.
