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I've got a Pentax k5, I'm looking at my first lens for it (just something to mess around with until I get the hang of the camera) and I see pentax SMC 28-80 f3.5-5.6,Tokina 28-70 f3.5-4.5,Takumar F 28-80 f:1 3.5-4.5,Sigma 28-70mm f3.5-4.5 & Tamron Asperical 28-80mm f3.5-5.6 all near the same price, I'm not exactly sure which to buy because they all seem so close spec wise, maybe I'm just not smart enough to decipher the difference