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Sony has introduced smaller CFexpress Type A memory cards with the introduction of the A7S III mirrorless camera, with high speed (700MB / s read / 800MB / s write) option for recording bursts or 4K / 8K video. Unfortunately, Sony itself is the only manufacturer that uses the slot and actually sells memory cards, so it loads through the nose. Fortunately, ProGrade has just released its own model, the CFexpress Type A Cobalt, with the 160 GB card $ 330 – $ 70 less than Sony’s 160 GB card.
Pre-order ProGrade CFexpress Type A Cobalt 160GB from B&H – $ 330
As a reminder, CFexpress Type A uses the same high-speed CFexpress technology as the Type B cards, so the Cobalt card can deliver burst / write speeds of 800MB / s / 700MB / s and sustained write speeds of 400MB / s. It is significantly faster than SD UHS II can do (read / write speeds up to 300MB / s), although slower than CFexpress Type B (1,750MB / s read and 1,000MB / s write). Still, it’s easy fast enough to make high – speed photo bursts without stuttering, along with 8K or 4K 120p video.
Only two cameras actually use the slot, Sony’s A7S III and A1, and both have dual slots that can accept SD UHS II or CFexpress Type A cards. However, if you own one of the cameras, you know that CFexpress Type A is very preferred as it supports all the video formats of the cameras and works better for high speed bursts. The latter is the most important, as the A1 can take 50 megapixel RAW photos at up to 30 fps.
With few camera models supporting CFexpress Type A, other third-party card makers have yet to jump on board, though Delkin has also announced cards coming soon. Sony charges $ 200 for the 80GB card but $ 400 for the 160GB version, but you can now pre-order the ProGrade 160GB version for a more reasonable $ 330.