Extensive answer to first question: http://strobist.blogspot.com/2007/05...peed-pt-1.html
Second question: You need a master light if you're using your SB600 as an optical slave. In other words, if you're using light to trigger it, you gotta make that light somehow. Doing it without the onboard flash requires buying stuff.
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But Mom, Pentax IS rebellious
Pentax K-7, K20D
Pentax SMCP-FA 35mm f/2.0 AL -- Pentax SMC 50mm f/1.7 -- Pentax DA 50-200mm f/4-5.6 ED -- Sigma 28-70mm f/2.8 EX DG IF Aspherical -- Pentax DA 18-55mm f/3.5-5.6 WR
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