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Thanks everyone for your thoughts on my image.
I've gone back and stacked some other avi's that I took because there was a dark area just above Europa's shadow that I wasn't sure about. Rob, I too at first thought it was Europa's shadow but it now appears it is the darker area below it. It turns out that it was a stacking artifact that is not present in these newer stacks. However I'm not too concerned as it was only a test of eyepiece projection.
One thing I have determined is I really need to clean my eyepiece if I want to use this method for planetary imaging!!
Rob, thanks for your help on both counts. I've used the formula you provided and I've come up with a focal length of 6392mm and an f ratio of f/31. This sounds pretty big to me but the image was about twice the size of the prime focus image which was f/14. Therefore I'll stick with that value!!
Cheers,
Mario
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