CFexpress Type A vs SDXC: Which Card Fits Your Camera?
By B&C Camera | Published: 2026-11-01
Category: Buying Guides
Compare Sony's CFexpress 4.0 Type A TOUGH and Promaster's Rugged CINE UHS-II SDXC on slot compatibility, durability, and the speed your mirrorless camera actually needs.
Quick answer
Buy the Sony CFexpress 4.0 Type A TOUGH only if your camera has a Type A slot and you need its speed and rugged build; otherwise the Promaster SDXC 256GB Rugged CINE UHS-II is the safer, more universal pick for UHS-II SD slots.
Slot compatibility decides first
A CFexpress Type A card is physically smaller than an SD card and will not fit an SD-only slot, while an SDXC card will not fit a Type A slot. Check your camera body's card door labels before comparing speed or price. The Sony card is listed for select Sony cameras and devices, so confirm your model supports CFexpress Type A rather than assuming it does.
Where the Sony TOUGH card earns its price
The Sony CFexpress 4.0 Type A TOUGH comes in 480GB and 240GB capacities and is built with a rugged TOUGH design for demanding photography and videography. If you shoot long bursts or high-bitrate video on a compatible Sony body, that combination of capacity and construction is the reason to pay more. The trade-off is narrower compatibility and a higher catalog price than the SDXC option.
Where the Promaster Rugged CINE fits better
The Promaster SDXC 256GB Rugged CINE UHS-II uses a molded, world-proof design that the catalog describes as up to three times stronger than normal memory cards, with industrial-grade components rated against water, humidity, heat, cold, and impact. Its LOCK switch has been removed, which reduces one common failure point on standard SD cards. The trade-off is that it is an SDXC card, so it cannot deliver Type A performance or fit a Type A-only slot.
Speed for 4K video is not the whole story
Card speed for 4K video matters, but the camera's recording bitrate and card slot standard set the ceiling. A UHS-II SDXC card is the practical choice for many mirrorless bodies that record 4K to SD, while CFexpress Type A is aimed at cameras designed around that faster bus. The supplied catalog does not list read or write speeds for either card, so use the camera maker's approved-media list rather than guessing from the format name.
Trade-offs to weigh before checkout
- Compatibility vs. peak speed: If your camera has a CFexpress Type A slot, the Sony card is the faster-format option; if it has only SD slots, the Promaster UHS-II card is the one that will actually work. Confirm the slot label on your camera body before comparing anything else.
- Rugged build vs. capacity: The Promaster card emphasizes weather and impact resistance at 256GB, while the Sony TOUGH card offers 240GB or 480GB in a Type A format; match capacity to your shoot length and offload habits.
- Price vs. future-proofing: The Sony card carries a higher catalog price and a narrower device list, so buy it for a camera you already own or plan to keep; the Promaster card is the lower-cost route for SD-based workflows. Do not buy a Type A card for a camera that cannot use it, even at a discount.
Product facts at a glance
- Sony CFexpress 4.0 Type A TOUGH Memory Card: CFexpress 4.0 Type A format with 480GB and 240GB capacity options and a TOUGH design. Choose it only for a compatible Type A slot, and pick capacity based on how much high-bitrate footage you need between offloads.
Sony CFexpress 4.0 Type A TOUGH Memory Card - Promaster SDXC 256GB Rugged CINE UHS-II: SDXC 256GB UHS-II card with a molded, world-proof design and no LOCK switch. It suits UHS-II SD slots and adds weather and impact resistance for outdoor shooting, but it is not a Type A substitute.
Promaster SDXC 256GB Rugged CINE UHS-II
Which card is right for you?
Best for
- Sony mirrorless shooters with a confirmed CFexpress Type A slot who need high-capacity, rugged storage
- Photographers and videographers who want a weather-resistant UHS-II SDXC card for SD-slot cameras
Not for
- Cameras with SD-only slots, which cannot use the Sony CFexpress Type A card
- Cameras with CFexpress Type A-only slots, which cannot use the Promaster SDXC card
