My question before was more geared towards zoom lenses (like my kit lens) which has a variable relative aperture (to quote wikipedia) across it's range. So at 18mm I can use f3.5, but at 55mm wide open is f5.6. Like RussHeath I just want to clarify. I can always just shoot with a fixed focal length lens if need be 
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Pentax K100D, Sigma 70-300mm F4-5.6 Macro Super II, SMC Pentax-DA F3.5-5.6 18-55mm AL, SMC Pentax-M 1:2 50mm, Vivitar 1:2.8 MC Wide Angle 28mm, Pentax 540FGZ, Vivitar 285HV, Cactus wireless trigger and receivers
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