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Originally Posted by Stephen Fox
I have no experience of digiscoping but if you are happy with manual focus then 1.4X will give 560mm at full reach from 100-400L, with little loss of quality (depending on TC). I suggest the lens is stopped down one stop to maintain quality but, is there enough light on your subject to allow low ISO, f8 and decent shutter to avoid blur/shake at 560mm?
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Stephen, in short, no there is not enough light for f8(f11 as it beomes) and low ISO, I will need to use ISO 800. Neat Image should clean up the noise which isnt too bad at 800 on the 20D.