SD Card (UHS-I / UHS-II) vs CFexpress Type A or Type B vs CFast 2.0: Honest Comparison and a Clear Winner
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Side-by-Side Spec Comparison
Before diving into use cases and recommendations, here is a direct specification comparison. Use this table as a quick reference when you need to compare a specific attribute.
| Specification | SD Card (UHS-I / UHS-II) | CFexpress Type B (or Type A) | CFast 2.0 |
|---|---|---|---|
| Interface | UHS-I (~104 MB/s), UHS-II (~312 MB/s) | PCIe Gen3 x2 — up to 1,800 MB/s write (Type B) | SATA III — up to 550 MB/s |
| Max write speed (common cards) | UHS-II: ~260-290 MB/s (Sony Tough, ProGrade) | CFexpress B: 1,400-1,700 MB/s (Sony Tough CEB, ProGrade Gold) | Lexar CFast 2.0: 440-515 MB/s |
| Compatible cameras | Almost all cameras — from entry DSLR to modern mirrorless | Canon EOS R3/R5/R5C, Nikon Z9/Z8/Z6III, Sony A1/A9III | Canon C100/C300/C500 series; some 1D X bodies |
| Price per 256GB (2026) | SD UHS-II: $60-100 (ProGrade, Sony Tough) | CFexpress Type B 256GB: $120-200 (Angelbird, ProGrade) | CFast 256GB: $150-300 (Lexar, SanDisk) |
| Durability (rated) | SD: fragile pin-less slot; UHS-II more durable than older cards | CFexpress: ruggedized; Sony Tough Mk2 rated to 180N bending force | CFast: no protruding pins, but fragile CF door mechanism |
| Buffer clearing speed | Adequate for 8-10fps burst shooting | Essential for 20-30fps RAW burst (Canon R5, Nikon Z9) | Good for 4K RAW cinema; insufficient for latest mirrorless burst |
| Availability | Universal — sold in airports, camera shops worldwide | Specialty retailers; B&H, Adorama, Amazon | Declining — primarily Canon Cinema system specialty |
Real-World Use Cases: Which Option Wins for Your Situation?
Specifications only tell part of the story. Here is how each option stacks up for specific photography scenarios:
Save| Your Situation | Best Choice | Why |
|---|---|---|
| Travel photographer with Sony A7C/A7IV or Fuji X-T5 | SD UHS-II | These cameras accept SD cards only. A V60 or V90 UHS-II card handles RAW burst and 4K video reliably. ProGrade Digital Cobalt V90 or Sony Tough series are the professional standard. |
| Sports and wildlife burst photographer (Canon R5, Nikon Z9) | CFexpress Type B | 20-30fps mechanical-electronic RAW burst fills a buffer in seconds — only CFexpress can clear it fast enough to sustain continuous shooting. |
| Cinema operator on Canon C300/C500 | CFast 2.0 | Legacy format required by the Canon Cinema EOS line. Buy Lexar 3400x or Angelbird CFast 2.0 cards — third-party brands are substantially cheaper than Canon-branded cards. |
| Beginner or casual photographer | SD (UHS-I is fine) | UHS-I cards (SanDisk Extreme, Lexar 667x) are more than fast enough for single-shot RAW photography and 1080p video. Save money here. |
| Wedding photographer (dual card slots) | SD UHS-II + SD UHS-II | Dual SD slots allow redundant backup recording simultaneously. Both cards run at UHS-II speed — no bottleneck for wedding-photography burst rates. |
Pricing Breakdown
Price-per-gigabyte has improved significantly since 2023. In 2026: 128GB SD UHS-II (V90, ProGrade) costs approximately $65-80; 256GB version $95-130. CFexpress Type B 256GB runs $120-200 for quality brands (Angelbird AV Pro, ProGrade Gold). CFast 2.0 256GB costs $150-300. Avoid off-brand SD cards — counterfeit and underspecified SD cards are common; stick to SanDisk Extreme Pro, Lexar, ProGrade, Sony Tough, or Delkin Power.
Alternatives Worth Considering
Before you commit to either option, these alternatives may better suit your specific needs:
- CFexpress Type A (Sony): Smaller form factor than Type B — fits Sony A9 III, A7R V, and A1 dual CFexpress/SD slots. Slightly slower than Type B but uses the PCIe interface: $100-150 for 160GB.
- CompactFlash (CF): Legacy format — primarily for Canon 1D X, 5D Mark IV, and Nikon D850. Increasingly obsolete; buy UHS-II SD adapters where possible.
- MicroSD with adapter: For most mirrorless cameras, a V30-rated microSD (256GB $40-60) is a legitimate budget travel backup card for JPEG shooting and video up to 4K/30p.
Frequently Asked Questions
Do I need CFexpress for mirrorless cameras?
Only if your camera supports it AND you shoot high-speed burst RAW. Most Sony A7, Fuji X, and Nikon Z series cameras with SD slots work perfectly on UHS-II cards even at high burst rates.
What does the V rating on SD cards mean?
Video Speed Class (V6, V10, V30, V60, V90) denotes the minimum sustained write speed in MB/s. V90 (90 MB/s minimum sustained) is the professional standard for 8K video and RAW burst. V60 handles 4K RAW.
Is it safe to buy SD cards from Amazon?
Buy only from Amazon-direct or authorized sellers (B&H, Adorama, Adorama). Marketplace sellers sometimes ship counterfeit cards. Verify authenticity with manufacturer SD validation apps (SanDisk Memory Zone, ProGrade Refresh).
How many cards should I carry on a trip?
Professional recommendation: at least 2 cards in active use (one in-camera, one backup) plus one extra stored separately in your luggage. Never put all your images on a single card.
The Bottom Line
Our recommendation: SD (UHS-II) for most photographers; CFexpress for high-speed burst and 8K video; CFast for legacy Canon C300 series. The best choice ultimately depends on your specific shooting style, budget, and existing kit. Use the use-case table above as your primary decision framework — find your most common scenario and choose the option that wins there. Both options in this comparison are used by working professional photographers; you cannot make a wrong choice if it aligns with your actual workflow.