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Thank you both for your replies on the Tamron and Sigma I really appreciate it. This may seem like a silly question, but I'm teaching myself photography, if the lenses (Tamron f2.8 and the Sigma f2.8) are only listed with one f number 2.8, does that mean that you can only use f2.8 throughout the whole zoom range (70-200mm) with either lens? Or can either lens also be used at f5.6, f8, f22 etc.
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