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Lexar developing SD Express & microSD Express cards, a format not yet supported by any camera: Digital Photography Review
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RG SDExpress Golden Eagle SDXC Express SD Card 256GB | SD 7.0 V30 A1 820/500 Mb/S Read/Write, Backwards Compatible, 3D, RAW, Burst Mode, 4K UHD Video |Extreme Speed| Bonus SDExpress Reader Included. :
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