I shoot stills, not video. I recently had the experience of a CF express type B card becoming unreadable while containing my best-ever photos of a hawk in flight. I eventually got the data recovered, but doing so was expensive and not something I ever want to repeat. One thing I am doing to avoid this situation is to have my Z9 record to both cards, rather than to record on one and use the other for overflow. I was concerned that this approach might cause buffer problems when I shoot continuously. For that reason, I got some of the newly released 400 GB iridium cards. I then tried shooting continuously to see what would happen. To duplicate lousy but not unusual conditions, I set the shutter speed to 1/4000, the aperture to wide open, and the ISO to 12800, since I ... MoreI shoot stills, not video. I recently had the experience of a CF express type B card becoming unreadable while containing my best-ever photos of a hawk in flight. I eventually got the data recovered, but doing so was expensive and not something I ever want to repeat. One thing I am doing to avoid this situation is to have my Z9 record to both cards, rather than to record on one and use the other for overflow. I was concerned that this approach might cause buffer problems when I shoot continuously. For that reason, I got some of the newly released 400 GB iridium cards. I then tried shooting continuously to see what would happen. To duplicate lousy but not unusual conditions, I set the shutter speed to 1/4000, the aperture to wide open, and the ISO to 12800, since I was in the woods and the day was totally overcast. Also, I was shooting uncompressed RAW files, which ended up at something over 60 MG each, as I recall, at 20 FPS. On each of several tries I got over 50 shots before the buffer slowed down. I figure that this will not be a problem for me, but if it is, I can always switch to lightly compressed RAW files.I have since had a couple of sessions shooting hummingbirds at 20 FPS, without ever hitting the buffer limit.

I just bought this for a birding trip to Costa Rica- Lightening fast!

I got these cards only a couple days ago for my new A1. They worked great for those few days but now the camera refuses to boot up with these cards. At first I thought it was the camera but eventually after cycling through all my batteries and dummy batteries multiple times I took the cards out and the camera turned on again.I put in some other cards and the camera turned on. I put these in again and the A1 would not turn on. Put in the other ones and it powers on again. Tried these cards again and it won't turn on anymore. It's very clear to me the issue is with these cards. The ones that work by the way are Prograde 256GB UHS-II cards. I got these because I like the brand but I don't know anymore.I'm trying to figure out the issue with prograde and hopefully ... MoreI got these cards only a couple days ago for my new A1. They worked great for those few days but now the camera refuses to boot up with these cards. At first I thought it was the camera but eventually after cycling through all my batteries and dummy batteries multiple times I took the cards out and the camera turned on again.I put in some other cards and the camera turned on. I put these in again and the A1 would not turn on. Put in the other ones and it powers on again. Tried these cards again and it won't turn on anymore. It's very clear to me the issue is with these cards. The ones that work by the way are Prograde 256GB UHS-II cards. I got these because I like the brand but I don't know anymore.I'm trying to figure out the issue with prograde and hopefully that'll fix it. Maybe mine are faulty. Maybe the guy who left a 5 star review has 24 hours left before his self destruct. Maybe I'm crazy. But if I were you I'd avoid them for now.