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NGC 3372 Eta Carinae Nebula (4in f4.5 20Da).jpg
NGC 3372 Eta Carinae Nebula. Taken with 4-inch AP Traveler apo refractor at f/4.5 with Canon 20Da camera at ISO 400 for stack of 4 x 10 minute exposures. Taken from Coonabarabran, NSW, March 27, 2007. Compare to version shot with 5D camera at f/6 with similar field size to compare red sensitivity and color balance.