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Contrails form at high altitudes--30 thousand feet (6 miles) and above. Temperatures need to be -40 degrees or colder. An interesting side note. Minus 40 degrees F is exactly the same temperature as minus 40 degrees C.
Took these with my son's DSi a few months back. Had to tinker with noise reduction and all that fun stuff. The point of the photos is not the quality, but the content. I like contrails.
Always struck by the perfectly straight lines drawn by jets as the traverse the contrasting blue skies.
Widow Skimmer (libellula luctuosa)
Nikon D200 w Nikkor 300mm f/2.8, 1/2000 @ f/2.8 & ISO 200.
_BW10420
Twilight time, a contrail is on left side of the luminous Venus in eastern sky. Mercury and Jupiter (smallest vs largest planet) are tiny dots almost washed by the approaching sun.
spotted a lamppost doing a great impression of a flagpole, at the same time as some contrails thought they were a Saltire!