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Using Remote Live View on the 40D (on a computer screen), I had little problem in focusing a 400mm F5.6 with x2 EF II Converter (efl 800mm F11) on a slender crescent Moon and obtaining a sharp photo.
However, if I had to use (camera based) Live View on the 3” LCD on the back of the Canon 40D, I suspect it might have been a little more difficult, due to the size of LCD, the bent over viewing position, etc.
A motorised focuser on the 400mm F5.6 would have been sweet!
Cheers
Dennis
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