Best SD Card for Luna Ultra: Which Capacity Should You Buy?

Let’s start with the conclusion: 256GB is the best value for money and the safest capacity choice for most users.

The Insta360 Luna Ultra comes with only 47GB of built-in storage. For a gimbal camera that supports 8K video recording and features a telephoto lens, this built-in capacity clearly won’t last long. We recommend picking up 1–2 SD memory cards alongside the camera.

This article provides a detailed breakdown of recording times and prices across different memory card capacities, helping you figure out exactly which capacity is right for you in one read.

Memory Card Specs for the Luna Ultra

Insta360 Luna Ultra memory card requirements:

• Speed class V30 or above
• UHS-I (do not choose UHS-II or UHS-III)
• Maximum capacity: 1TB

We recommend the SanDisk Extreme series, or you can go directly with the official Insta360 SD memory card.

Note that SanDisk SD cards come in three product lines: Ultra, Extreme, and Extreme PRO. Here’s the catch: the entry-level Ultra doesn’t meet V30 write speed requirements. If you use it for 8K or high-fps video recording, the footage data may fail to write properly — and could even corrupt your existing footage.

If you’re going with SanDisk, make sure to choose the Extreme or Extreme PRO series.

Which Memory Card Capacity Offers the Best Value?

Memory card prices have been fluctuating recently. Based on prices as of 2026:

Capacity	Price (USD)	Cost per GB
512 GB	$139.99	$3.65
256 GB	$89.99	$2.84
128 GB	$59.99	$2.13

As you can see, the best value-for-money options are 128 GB and 256 GB.

How Long Can Each Memory Card Capacity Record?

Below are the tested recording times for the Luna Ultra at different capacities and quality settings:

Quality	64GB	128GB	256GB	512GB	Built-in Storage
4K 30fps	2h16m	4h31m	9h7m	18h41m	1h48m
4K 60fps	1h57m	3h52m	7h49m	16h2m	1h33m
8K 30fps	1h31m	3h1m	6h6m	12h30m	1h12m

64GB: Not Recommended

64GB only records about 2 hours and 16 minutes at 4K 30fps — essentially one full charge will use up the entire card. Moreover, Insta360 no longer offers a 64GB option, so you’d have to buy from third-party brands like SanDisk or Lexar. This capacity clearly falls short of the Luna Ultra’s 8K recording demands.

128GB: Barely Sufficient

The 128GB falls into the “barely sufficient” tier. If you have a habit of regularly organizing your footage — deleting after editing, backing up to the cloud after shooting — 128GB will keep you disciplined and prevent endless accumulation of raw files.

However, if you’re a beginner who records multiple takes of several minutes each before selecting clips, 128GB will fill up faster than you’d expect.

	Battery Life	128 GB Recording Time	Built-in Storage
4K30fps	2h 18m	4h 31m	4h 31m
4K60fps	2h 1m	3h 52m	3h 52m
8K30fps	2h	3h 1m	3h 1m

256GB: The Most Recommended Choice

The 256GB offers the best balance of capacity and price, and is the safest capacity choice for most shooting scenarios. In our testing, it recorded over 9 hours at 4K 30fps — even if you don’t regularly organize your footage, this capacity will last you for months.

Unless you plan to use the memory card as a long-term “warehouse” for stockpiling raw video footage, 256GB is more than enough.

512GB: Practically “Warehouse-Level” Capacity

The 512GB card delivers 18 hours and 41 minutes of recording time (4K 30fps). Even with intensive shooting during long trips, it’s hard to actually fill up 512GB. This capacity does offer the lowest cost per GB, but the trade-off is a higher upfront investment — and the sheer capacity can make you lazy about organizing, causing footage to pile up and post-production to drag on indefinitely.

Memory Card FAQ

128GB vs. 256GB: Which Should You Choose?

It depends on your shooting habits. If you want extra headroom, 256GB gives you more peace of mind. If you mainly shoot casual vlogs with relatively short individual recording sessions, 128GB is sufficient.

How Many Memory Cards Should You Prepare?

We recommend having at least 2 cards: one as your primary card and one as a backup. This covers you against the risk of running out of space or card failure during a shoot.

Is There Always a Discrepancy in Memory Card Capacity?

SD memory cards need to reserve some space for caching during recording, so the actual usable capacity is slightly less than the labeled capacity. A difference of 1–2GB is within normal range.
Generally, the actual capacity of an SD card is approximately 90% of the labeled capacity. Keep this in mind when purchasing.

Should You Format Your Memory Card Regularly?

Yes. Compared to hard drives and SSDs, microSD cards are more prone to accumulating “garbage” data through repeated write and delete cycles. We recommend regularly backing up your footage and formatting the card to extend its lifespan and maintain stable recording performance.

Are There Counterfeit Cards on the Market?

There are indeed counterfeit SanDisk memory cards circulating on the market. Before purchasing, carefully check the packaging — authentic cards typically have bolder, clearer printing. To completely avoid the risk of counterfeits, buying from the Insta360 official store or SanDisk’s authorized retail channels is the safest option.

Conclusion

The Insta360 Luna Ultra uses a different storage format than some action cameras. Certain low-priced memory cards may claim “Luna Ultra compatible,” but the actual user experience may not be stable — always check product descriptions carefully before purchasing. Choosing the right memory card comes down to three key factors: brand, capacity, and video speed class. If you’re still unsure which card to pick, ordering directly from the Insta360 official store is the safest bet.

If you’re still torn on which capacity to choose — 256GB is the choice you can’t go wrong with. It offers plenty of capacity at a reasonable price, making it ideal for most people’s shooting pace.