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use layers.use normal as blend mode-first image as background. Second image 50 %, third 33% , fourth 25%
But there is a much betteroption for stacking. Download Deepsky Stacker--if it is Deep sky images you are after (its free) and its great
or IRIS but thats a lot harder to use even if far more powerful
if its planets-and I dont see why youd use 60 sec images for planets-registax is your freeware answer
so to summarise -can be done in photshop but why bother, there are better freeware tools that do the job much better
use photsohop for curves and so on after you have done the stacking
my 2c
Narayan
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