Elephant Trunk Nebula in IC1396, in H alpha and OIII


My original processing of this image (mouseover) was a simple screen of OIII over Ha to whiten the stars. Thanks to some kind assistance from J-P Metsavaino, I now understand much better how to apply very dim OIII data effectively (mouse off, and link).

Ha: Bootland Farm, August 18 (6x) and my back yard, August 22 (11x); OIII: Verendrye airstrip, August 27 (7x1000s); Parsec 8300M on TV85 at f/5.6; guided.



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