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How to overcome changing light?

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#1 hov1s
Hi everyone,
 
I am thinking of shooting a sequence in about 36 hours, capturing the milky way core as it rises over the sea for about 50 mins, and then following through beyond sunrise.  My lenses aren't particularly fast, although I shoot with a semi pro fx body. 
The whole sequence should be about four hours to shoot. 
My question is, has anyone changed ISO in the middle of a sequence, and what was the end result? 
I'm kind of thinking to start I'll be using ISO 3200 @f/2.8-3.5 for the milky way, but as it gets lighter, that's probably going to be too much!  I've changed the f stop before in a sequence and it didn't go well, so I'm wondering if changing the ISO will be just as bad.
Does anyone have any experience I can draw on?
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#2 Gunther
To change ISO and Exposure while shooting to compensate for the changes in Brightness is the essence of the so called "Holy Grail Approach".
I've explained this in detail in my EBook: https://lrtimelapse.com/shop/ebook/
Here is a video also, where I explain how to do it automatically. https://lrtimelapse.com/gear/dslrdashboard/
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#3 hov1s
Thanks Gunther, I'm checking it out now.  Smile

.......... And having just watched your video link, I can see I have been using lrtimelapse holy grail feature all wrong. Big Grin
I think I'll have to invest a little more learning time. Wink

...also check out: