It really depends on what recording modes and frame rates you plan on using most.

• CFexpress Type A: Essential if you want to unlock the full potential of the camera—specifically high-frame-rate S&Q modes (like 4K 120fps) and high-bitrate All-Intra (XAVC S-I) codecs. If you do high-end commercial work or heavy slow-motion, CFexpress Type A is worth the investment for peace of mind and faster offload speeds.

• UHS-II SD Cards (V90 / V60): Perfect for standard 4K recording (XAVC S / XAVC HS Long GOP) up to 60fps. V90 cards handle almost all standard bitrates without issue.

Recommendation: Grab at least one decent CFexpress Type A for your primary slot when shooting high-speed/All-I footage, and keep a couple of V90 SD cards as reliable backups.

Honestly, unless you are shooting 4K 120p All-Intra constantly, you don't need to drop a ton of money on CFexpress Type A cards right away.

A quality UHS-II V90 SD card (or even V60 for standard 4K Long GOP) gives you plenty of headroom for most documentary, interview, and event setups. You’ll save a massive amount of money per GB, which you can redirect toward extra batteries or storage drives.

My advice: buy two identical V90 SD cards so you can shoot simultaneous dual-slot backup without worrying about buffer mismatches.

Don't forget about workflow and heat management when making your decision:

1. Offload Speeds: CFexpress Type A cards ingest into your editing rig significantly faster than SD cards, which saves a huge amount of time at the end of a long shoot day.

2. Dual-Card Backup: If you shoot critical event or documentary work, always record to both slots simultaneously. Remember that your write speed is capped by the slower card in dual-recording mode!

3. Thermal Performance: CFexpress cards dissipate heat much better during long, continuous takes than SD cards.

If client work is paying the bills, bite the bullet and go CFexpress Type A across both slots.

Congrats on the new setup! Seriously, the FX5 is such an amazing camera for doc work, you are going to love the footage you get. Look, I totally get the stress about card costs. I remember when I first started, I agonized over the exact same choice! Honestly, for interviews and steady shots, you really dont need the most expensive tank-like cards out there. I went the cheaper route to snag more storage and it was the best call ever. Here is how I look at it now:

• Always prioritize having two cards over one fancy one because life happens.
• Higher write speeds are key for the codec, but you dont need to break the bank for the top tier.
• Reliability is about treating your gear right, not just the brand name. Grab the more affordable option and get that backup drive!

Re: "Just saw this thread and figured I would..." - honestly, that advice about thermal management is spot on, but I feel like people always overcomplicate this. I have been using these rigs for a while now and honestly, I have had nothing but headaches with some of the pricier options that people swear by. Unfortunately, I have had a few cards just totally crap out on me in the field despite the marketing about them being indestructible. It is super frustrating when you are mid-shoot and the camera just refuses to write the file, you know? Before you drop that cash, are you planning on shooting in the highest bitrate settings all day long, or just for the A-roll stuff? That honestly changes everything for what you actually need to buy. If you are just doing standard interviews, you honestly dont need to break the bank on the top-tier stuff. I have found that just grabbing whatever V60 or V90 options you can find from Lexar or Kingston usually does the trick just fine. They are way more affordable and I have never had a real issue with them compared to the ones that claim to be ruggedized. You are basically paying for a fancy label half the time. Save your money for some extra batteries or a decent mic instead, honestly.

Man, card prices are just brutal right now. I usually run Angelbird AV PRO V90 128GB or Transcend SDXC 700S 128GB UHS-II, but honestly, it is all just expensive plastic at the end of the day.

Just saw this thread and figured I would chime in because the FX5 is a beast but it definitely demands consistent write speeds for those high bitrate codecs. In my experience over the years, the biggest issue isnt actually the durability of the casing, its the thermal management and the controller reliability when you are shooting long-form documentary interviews. If you are doing back-to-back interviews, the cards get real hot. I have tried many brands, and honestly, the ProGrade Digital V90 128GB SDXC UHS-II is usually rock solid for the money. Save the extra cash and put it toward a reliable backup. The Sony Tough cards are built like tanks, sure, but unless you are filming in a monsoon or doing extreme field work, the performance delta is pretty negligible for standard doc interviews. Just make sure you are formatting the card in-camera every single time you clear it. That prevents a lot of file system corruption issues that folks blame on the cards. If you want to check out one other contender that has been bulletproof for me recently, look at the Delkin Devices Power V90 128GB SDXC UHS-II. It has excellent sustained write speeds and I have never had a dropped frame with it, even at the highest bitrates. Grab two of those instead of one overpriced Sony card and you will be in much better shape for your shoot next month.

> Do I really need the Tough cards for basic interviews or should I just go with the ProGrade and call it a day? Honestly, unless you are shooting in a monsoon or crawling through dirt, you really dont need the extra ruggedness of those premium cards. I personally stopped buying the overpriced ones a few years ago because they just dont pay off for static interview setups. You should look into Lexar Professional 1667x 256GB SDXC UHS-II. They are way easier on the wallet and honestly hold up fine for doc stuff as long as you keep your firmware updated. If you want something a bit faster, check out the SanDisk Extreme Pro 128GB SDXC UHS-II. I have a few of these in my bag right now and they havent failed me once. Just keep your backups organized and dont sweat the fancy branding.