Buying SD Cards for a Camera in Japan

Start with the camera manual

Confirm supported card family and maximum or recommended capacity. Some cameras support SDXC but not every newer bus mode or performance class.

Understand the speed symbols

The SD Association currently defines Speed Class, UHS Speed Class, Video Speed Class and SD Express Speed Class. These symbols indicate minimum sequential write performance under the relevant standard; they are especially important for sustained video recording.

SD Association speed-class guide

Fast card, slow camera

A card can be backward compatible yet limited by the camera's interface. Paying more for a faster class only helps if the camera and recording mode can use it.

Capacity changes failure impact

One very large card reduces card swaps but puts more images in one failure domain. Multiple smaller cards add handling and organization. Choose the tradeoff deliberately.

Format in the camera after backing up

When appropriate for your workflow, format a new card in the camera rather than assuming a factory file system is ideal. Never format a card containing the only copy of important images.

Use the recording mode as the real requirement

If you mainly shoot stills, your priority may be reliable write speed and enough capacity for the trip. If you record high-bitrate video or long bursts, use the camera manual's required card class for that mode and check whether the body supports UHS-I, UHS-II or another interface. A card that exceeds the camera's bus capability can still work, but the extra advertised speed may not improve in-camera performance.

Keep a second card as a workflow decision

If the camera has dual slots, decide whether you want backup recording, overflow or separate photo/video cards. Buy cards for that workflow rather than automatically matching capacities. Label or organize cards so a formatted card is not confused with one holding the only copy of trip images.