^ This. Also, just be real careful with the budget options. I once lost an entire afternoon of footage because a cheap card corrupted mid-write. It was devastating tbh. If you need something reliable that doesn't cost a fortune, I suggest looking into these:

• ProGrade Digital UHS-II V60 128GB - solid mid-tier choice
• Angelbird AV Pro SD MK2 V60 128GB - very dependable Just make sure to format them in-camera first. Double-check your settings too!

Everyone pushes those overpriced Sony cards like their life depends on it, but honestly most of that is just marketing hype. If you want something that actually holds up without costing a fortune, check out the ProGrade Digital V90 128GB UHS-II. I have been using one for months and it never drops a frame. It is way more reliable than the name brands and way cheaper too, just dont buy into the paid review noise.

This comes up a lot. If you are dropping frames, your current card lacks the sustained write speed required for the camera's high-bitrate XAVC S-I codec. You need a V90 rating, period.

• Lexar Professional 1667x 128GB SDXC UHS-II is often cheaper and handles 4K well.
• Angelbird AV PRO SD V90 128GB is reliable for sustained recording. Don't waste money on anything slower than V90.

Ugh, the frame drop issue is the absolute worst — I’ve been through three of these cards that claimed to be fast enough but just choked the second you hit record on high-bitrate settings. Honestly, don't even bother with anything less than a V90 if you're pushing that a7R V, because the camera is just too demanding for those cheaper cards to keep up with, especially if you're doing anything beyond basic 4K. I tried some off-brand stuff years ago and it was absolute garbage (lost an entire interview once, never again), so just save yourself the headache. If you're on a budget, look at these:

• Sony TOUGH-G Series 128GB V90 SD Card
• This is the gold standard for a reason; they don't snap in your bag.
• ProGrade Digital 128GB V90 SDXC UHS-II
• These are usually a bit cheaper than the Sony ones but perform just as well in my experience. Basically, the V90 rating matters because you need that sustained write speed to keep the buffer from filling up. If you try to save twenty bucks on a V60 card, you're just going to be back here in a month complaining about dropped frames again. It's a bummer to drop the cash upfront, but a reliable card is just part of the cost of shooting with a beast like that camera.

To add to the point above: it’s just total nonsense that we have to spend this kind of scratch just to get a camera to do its basic job. I’ve seen this same thing in the shop for decades—you buy a high-end machine, but the manufacturers make you pay through the nose for the 'official' accessories just to keep it running right. It’s a racket, honestly. Everything is built cheap now, and then they mark it up like it’s gold. Drives me crazy. You’re sitting there trying to film, and the thing just quits on you? That’s like a torque wrench snapping mid-turn. It’s pathetic. Quality control is out the window, and they just expect us to keep throwing money at the problem. I’m just about fed up with companies selling us gear that needs a thousand dollars in add-ons just to function without throwing a fit.

Yep been there done that. Can confirm everything said above is spot on.

Wow ok that changes things. Gonna have to rethink my approach now.

Regarding what #4 said about "Everyone pushes those overpriced Sony cards like their life depends on it," I kinda disagree. I get the frustration with the price tag, but IIRC, there is a legitimate reason the high-end cards are built differently regarding thermal management and internal component redundancy. I have burned through so many cards in the field, and honestly, when you are pushing that sensor, you really want something with a proven controller. Not sure but I think some of the cheaper ones just rely on aggressive firmware tricks to hit those speed ratings, which is why you see the frame drops. Anyway, bottom line is I wouldn't trust my footage to anything that doesn't have a solid track record of sustained throughput in high-heat scenarios. Maybe save a bit longer instead of gambling on the budget stuff? Just my two cents.

Ngl, I had the same issue when I started using my Sony camera. I was lowkey using cheap cards and lost a whole shoot. I switched to the ProGrade Digital V90 128GB UHS-II SDXC and haven't had a single drop since.

• It is cheaper than Sony's brand.
• Sustained write speeds are stable for 4K.
• Idk if your budget allows, but it is worth saving for over cheaper knockoffs.

Huh interesting. I had no idea. The more you know I guess 🤷

Coming back to this — before I suggest anything, what exactly is your budget cap? And are you shooting in XAVC S-I, or just the standard 4K modes?