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If I am taking long exposures for star trails how long should I wait between exposures to allow the sensor to cool down?

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    \$\begingroup\$ This is going to depend somewhat on the ambient temperature, a good answer would provide values for different temperature ranges. \$\endgroup\$
    – Matt Grum
    Feb 25, 2015 at 10:58
  • \$\begingroup\$ i'd think gaps between exposures will leave gaps in the trails. \$\endgroup\$
    – ths
    Feb 25, 2015 at 15:00
  • \$\begingroup\$ @ths I assume the intention is to have individual long exposures, not a stacked one. \$\endgroup\$
    – mattdm
    Feb 25, 2015 at 19:39
  • \$\begingroup\$ @mattdm i interpreted the original "two sub in long exposure" as stacked. but who knows... \$\endgroup\$
    – ths
    Feb 25, 2015 at 20:42
  • \$\begingroup\$ I've not used it, but StarStaX claims to be helpful in filling in the gaps in star trails from multiple exposures - markus-enzweiler.de/StarStaX/StarStaX.html \$\endgroup\$
    – OldGeeksGuide
    Apr 14, 2015 at 20:23

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Depending on the camera, you can read the sensor temperature from makernotes using exiftool. See, for example, Olympus tag 0x1007 here. ths is right: intervals between exposures may leave gaps.

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