To give some idea of brightness, a 5min exposure with 10" f6.3 LX200 and 450D will not show it from my back yard. It needed 3 x 10 minutes and it is still about the same brightness as the background noise so LOTS of stretching needed to bring it out, and unfortunately that brought out lost of dust donuts and shocking vignetting! Bought a lightbox to fix that in future...
Mark.
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