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Pentax Optio 550 and 450: Digital Photography Review
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Digital Cameras - Pentax Optio 550 Camera Review, Information, Specifications
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Pentax Optio 550 Review: Digital Photography Review
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Pentax Optio 550 Review: Digital Photography Review
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Amazon.com: Synergy Digital Camera Battery, Works with Pentax Optio 550 Digital Camera, (li-ion, 3.7V, 1800 mAh) Ultra Hi-Capacity, Compatible with Fuji NP-120 Battery : Electronics