Transit of Venus on 2012-06-06 01:13 UTC
Spent some time re-processing my images of the transit of Venus back in 2012. It was a pity that I didn't take any flat field frames so the previous processed versions I got four years ago all have dust specks across the images. I utilised the algorithm described by Kuhn et al. (1991) to compute a flat field with image data only in IRIS and now the dust doughnuts no longer exist, at least largely removed. Registration was done in Avistack and wavelet adjustment in Registax5. The final result appears better than any of the previous versions. However, it still fails to reach my satisfactory because of thick high clouds and nasty seeing. I also should have used the video mode of the camera and tried lucky imaging, but I knew nothing about this function back in then.