Milky Way

Some truly beautiful work guys!

A quick question for anyone that might know anything about image "stacking" for the purpose of noise reduction... What is the minimum number of nightscape (Milky Way) images I should stack (with Photoshop) to have a meaningful amount of noise reduction?

I'm going to be heading down to Nor Cal during the next new-moon (in July), so any & all input would be greatly appreciated!
 
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I was hiking down to Supia AZ and we were leaving at 4am. I just snapped a few while i was packing my gear. It was so bright, that is pretty much straight out of the camera. I did a little PP but not much.
 

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