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Ricoh Pentax K-1 Mark II Full-Frame DSLR: Compact, Rugged & Weather-Resistant, Improved ISO 819200 Low-Light Capability, Dynamic Pixel Shift Resolution Mode for Pixel Shifting Without Using A Tripod, Astro Tracer for Tracing
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Pentax K-1 Mark II Review: A great SLR made better - and upgradeable
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Pentax K-1 Review
Pentax K-1 Mark II Astrophotography Review – Lonely Speck
Pentax's full-frame K-1 Mark II has a ridiculous ISO range | Engadget
Selecting the best ISO for night/astro photography - PentaxForums.com
Pentax K-1 II Review: A worthy upgrade?: Digital Photography Review
