Flame and Horsehead Nebulaes #223 of 365
December 29, 2013 at Fremont Peak State Park Ca.
251 second exposure with a Barn Door Tracker, 400mm, f5.6, ISO800
As this is one of my lon...
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December 29, 2013 at Fremont Peak State Park Ca.
251 second exposure with a Barn Door Tracker, 400mm, f5.6, ISO800
As this is one of my longest BDT exposures, the problems with open loop tracking (small streaking of stars) vs. closed loop star tracking is seen. At 4 minutes even with good alignment a BDT is weaker than a closed loop tracker.
Read less
251 second exposure with a Barn Door Tracker, 400mm, f5.6, ISO800
As this is one of my longest BDT exposures, the problems with open loop tracking (small streaking of stars) vs. closed loop star tracking is seen. At 4 minutes even with good alignment a BDT is weaker than a closed loop tracker.
Read less
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