sony a7r iii memory card slots: Sony a7R IV review: The Hybrid Shooter’s Dream Camera - Videomaker. Sony A7 IV vs A7R IV (A7R IVA) - The 10 Main Differences and Full ... . Sony A7C: Best Memory SD Cards.
The Sony a7R IV supports SD/SDHC/SDXC (UHS-I and UHS-II) memory cards in both
slot 1 and slot 2. You can also use microSD memory cards with this camera providing you use an appropriate adaptor.
The Sony A7R IV only has 2 SD (UHS-II compliant) memory
card slots while the Sony A7R V is built with two dual format card
slots which can hold 2 UHS-II SD cards or 2 CFexpress Type A cards.
The Sony a7C is Sony’s smallest full-frame camera to-date, but unlike its larger brother the a7III that features dual
memory card slots, the a7C is restricted to just one memory
card slot.