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Paul, your running that 1600 at high gain, and shooting 10 minute subs. Normal practice with the 1600 at high gain is to reduce sub times. You get less well depth at high gain and shooting for longer doesn't make it any deeper. Have a look at Shiraz's narrowband exposure chart, which he has posted here. I shoot most narrowband at Unity (Gain 139, Offset 20) and that is with 5 min subs max,i would never shoot longer subs with that camera, even at max well depth of Gain 76. When i shoot high gain (200), i drop my sub times down to 90 sec.
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