== Camera Artifacts : Bathtub Rings and Related Artifacts ==

=== Original Bathtub Rings ===

'''need some words here describing the classic bathtub rings and the fix with the drain voltage'''

=== Residual Bathtub Ring-like Effect ===

There is a pattern visible on at least ota36 which has an appearance very similar to the bathtub rings.  This was seen by Heather in magic tests.  The examples we have appear to be present only when video is occurring on ota36.  In the one example shown here, the feature appears in the first science image of the night with video (o5555g0031o) and continues for roughly an hour.  

|| o5555g0031o || o5555g0032o || o5555g0033o ||
|| [[Image(o5555g0031o36b8.jpeg)]] || [[Image(o5555g0032o36b8.jpeg)]] || [[Image(o5555g0033o36b8.jpeg)]] ||

|| o5555g0034o || o5555g0035o || o5555g0036o ||
|| [[Image(o5555g0034o36b8.jpeg)]] || [[Image(o5555g0035o36b8.jpeg)]] || [[Image(o5555g0036o36b8.jpeg)]] ||

|| o5555g0037o || o5555g0049o || o5555g0050o ||
|| [[Image(o5555g0037o36b8.jpeg)]] || [[Image(o5555g0049o36b8.jpeg)]] || [[Image(o5555g0050o36b8.jpeg)]] ||

|| o5555g0053o || o5555g0054o || o5555g0057o ||
|| [[Image(o5555g0053o36b8.jpeg)]] || [[Image(o5555g0054o36b8.jpeg)]] || [[Image(o5555g0057o36b8.jpeg)]] ||