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Hi Brad,
It sounds like you may trying to stack raw images. At ISO 1250 sounds like you running a Nikon?
Just to start with convert your images to tiff files, I presume you have some software to do so?
Won't matter how long your exposures are, DSS will stack them together. You may need to change register settings for stars, if you have a lot you can set it to 20% or more. If there's not many you may need to set it to below 10%
I know it sounds back to front but that's the way it works.
No need to re-centre with short exposures.
Hope this helps.
Cheers,
Justin.
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