When you’re packing for a serious shoot—especially a dive trip or travel assignment where reshoots aren’t an option—media reliability matters as much as the camera itself. The Delkin Devices BLACK CFexpress Type A 4.0 Memory Card (480/960GB) is built for exactly those situations: long days, high data rates, and zero tolerance for dropped frames. We’ve seen these Delkin memory cards used by customers shooting everything from fast-action stills to extended 8K video, and they’re chosen specifically because they just keep writing when cheaper cards choke.

This Delkin Black Series card combines high sustained performance with a rugged, travel-ready build. With fast read and write speeds over a PCIe interface and guaranteed minimum sustained write performance, it’s well suited for raw continuous burst photography and high-bitrate 8K, 6K, and 4K video. The physical durability also matters more than people expect—hot decks, rinse buckets, and constant card swaps are hard on media, and this is one of the cards we trust in those environments. One important note we flag often in pre-sale emails: this card is CFexpress Type A only and will not work in Type B, CFast 2.0, or CompactFlash slots.

• Best for: Sony mirrorless shooters traveling with high-end photo/video workflows
• Not for: Cameras that use CFexpress Type B or SD only (double-check before buying).
• Handles raw stills and high-frame-rate video without slowing mid-clip.
• Rugged build stands up better to heat, moisture, and frequent handling.
• Gotcha: You’ll need a dedicated CFexpress Type A reader for offloads—SD readers won’t work.

Perfect for…

• Liveaboards with multiple dives per day
• Day boats where you don’t want to swap cards between dives
• Shore dives where sand and heat punish slower media
• Macro night dives shooting long video clips
• Travelers trying to minimize card failures far from home

Content reviewed by Bluewater Photo staff for real-world use and compatibility.