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Message: <blockquote data-quote="nickt" data-source="post: 693650" data-attributes="member: 4923"><p>Most people say its a worthwhile function. It takes a 2nd dark shot for the same time length and uses it to map out sensor noise that results from the sensor warming. I don't use it because I don't like the delay. It doubles the time to take your image, kicking in at 8 seconds or more. For the rare times I take long night shots, I value a quick followup shot over any noise benefit. People taking star trails with the interval timer turn it off to not get gaps. Certainly give it a try. I think you might have to work a little to find a situation where it impresses. I'm not saying its worthless, just that I have not missed it for my particular shots. Maybe a really long exposure and high iso might benefit.</p></blockquote><p></p>