Despite, in hindsight how obvious and intuative it all is, its a head spin to start with, very painfull, but absolutely critical in Astrophotograhy. I resisted resolutely to begin with, but you have to master the layer beast, its worth more than spending more money on gear. Forget generic terestial tutes, a painfull waste of time. If you dont have it, get Ron Wodaskies Zone System book to get the hang of it, you wont regret it. Mastering layers is the single most cost effective step you can take.
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