Do different 64GB SDXC cards perform differently when used in my Pentax 645D camera? Why is this question important? SD cards of the same memory capacity vary in price. Some claim “faster shot-to-shot performance” but does it make any difference with my particular camera. The cards: Transcend 64GB SDXC Card Price 4,769 Yen (Amazon Japan) or $46.99 (Amazon.com) SanDisk Extreme 64GB SDXC Card Price 6390 Yen (Amazon Japan) or $73.69 (Amazon.com) SanDisk Extreme Pro 64GB SDXC Card   12,819 (Amazon Japan)  or 128.95 (Amazon.com) Whether purchased in Japan or in the U.S. there is a clear difference in pricing between the three cards. Prices shown are the best available prices on the Amazon websites as of writing. (Please feel free to click on the links, and I’ll make a few cents from any purchases you make. This is a bonus, but not the purpose of the post.) The camera: I’m using my Pentax 645D camera. It has twin SD card slots. I have them set up so that the camera writes the RAW DNG file to both cards …