With Apple (AAPL 0.53%) stock having experienced an enormous sell-off today because of missing analysts' incredibly lofty expectations for the company, the share price is hitting incredibly depressed levels. Does this make it a buy today? In this video, Motley Fool tech and telecom analyst Andrew Tonner discusses several of the headwinds the company faced this quarter, tells us what Apple's guidance for next quarter means and what it plans to do to gain smartphone market share, and tells us whether it's a buy with a lot of upside at the moment, or whether it still has further to fall.