Testing the new (old) lens the Canon 300mm F2.8 Fluorite.This is a single JPG 1min exposure at F2.8 with nebula filter ,ISO 1600 no guiding, in camera noise reduction on.Size reduced by running through Noiseware.No other processing.
Moon at 80%.
This lens is almost as good as the Canon 300mm F2.8L, the difference is very marginal as it has very slightly more CA.
http://users.bigpond.net.au/avandonk/m42.jpg
It looks like the whole saga of getting it here from the US was worth it.
Bert