Really did take some getting this image - friday was a day of towering cumulus clouds, with small, very small gaps in between, and these were short lived... I had several attempts to get the 6 panes as it kept clouding out on me, but, finally did get all 6 late in the afternoon. I made a mess of getting the flats for this, and didn't defocus as much as I should - my post avistack frames all had a dark patch, however use of the median filter, dodge and burn seems to have got rid of it. Hoping sunday is going to give me clear skies!