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Solar System
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Equipment
Milky Way
Observatory
Galaxies
Backfocus
position tests
camera at  ideal backfocus position
camera 0.7" out from ideal backfocus position
camera 0.7" out from ideal backfocus position
camera 0.7" out from ideal backfocus position
camera at  ideal backfocus position
camera at  ideal backfocus position
Note:  original 0.7" backfocus error test data replaced with
data from images that were properly focused.  Seeing
conditions for this test were slightly better than the ideal
backfocus position tests.