Photographer's Guide to the Sony DSC-RX100
I’ve conducted my own tests, using a Lexar 128GB 1000x memory card. When shooting JPEGs, both cameras can keep on firing continuously for quite a while (I’ve shot more than 150 JPEG Fine images continuously with the a7R II at 42 MP), but will slow down dramatically when the buffer fills. Additional shots are captured at a much slower speed, perhaps
... See moreDavid D. Busch • David Busch’s Sony Alpha a7R II/a7 II Guide to Digital Photography
Although the Sony a7 II users manual says a Class 4 rating is sufficient for recording movies, Sony technical support recommends a Class 10 card. If you want to take the highest quality videos with your camera, buy a card that is rated as Ultra High Speed (UHS). For this type of work, use the UHS Class 1 SD card.
Carol F. Roullard • The Sony A7 II: The Unofficial Quintessential Guide
Fuji X Secrets: 142 Ways to Make the Most of Your Fujifilm X Series Camera
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The SDXC cards are more expensive, but equally fast SDHC cards (with capacity up to 32GB) are quite affordable. I’ve standardized on Lexar Professional 1000x 128GB SDXC cards, although I still have quite a few of my older 64GB Lexar cards. For a camera with a 42.4-megapixel sensor, larger cards make the most sense.