Memory Cards for OM System OM-1: How to Choose the Right One

The best memory card for the OM System OM-1 is a fast, name-brand SD card rated UHS-II, in a capacity that suits how much you shoot. The camera has two SD slots that support UHS-II, so a slower card will hold back burst shooting and video even if the body can write faster. Here is how to pick cards that keep up and protect your files.

Know What the OM-1 Accepts

The OM-1 uses two SD card slots, and one of them is built for the faster UHS-II standard. That is important because this camera is known for high-speed continuous shooting and large raw files. A UHS-I card will still work, but it will clear the buffer more slowly and may limit how long you can hold a burst. Check the camera manual and the manufacturer’s current guidance for the exact slot behavior and any recommended card classes, since firmware updates can change details.

Because it uses SD cards, you do not need the more expensive CFexpress cards found in some other cameras. That keeps the total cost reasonable while still giving you real speed if you choose UHS-II.

Decoding the Symbols on the Card

SD cards carry a handful of markings that look cryptic but are simple once you know them.

• UHS-II: a second row of pins on the back; look for the Roman numeral II on the label.
• V60 or V90: video speed class, indicating a guaranteed minimum sustained write speed.
• U3: a general minimum speed class that suits many 4K recording situations.
• Read versus write speed: the big number on the front is usually read speed; write speed matters more in camera.

For still photographers, the write speed is what clears the buffer. For videographers, the V-class matters because it gives a guaranteed minimum rather than a peak figure. A good rule of thumb is to choose V60 as a minimum if you record high-bitrate video, and V90 if you want extra headroom.

Capacity Planning for Raw and Video

Raw files from a modern Micro Four Thirds sensor are moderate in size, but burst shooting multiplies storage quickly. Rather than guessing, look at your own folder sizes after a typical outing and divide. If you shoot wildlife or birds in long bursts, plan on more space than you think you need. A pair of mid-capacity cards is often better than a single huge one.

Card Choices at a Glance

Using Both Slots Wisely

With two slots, you can set the camera to record the same image to both cards as an automatic backup, or send raw files to one and JPEGs to the other, or let the second card act as overflow. Backup mode is the safest choice for paid work or once-in-a-lifetime trips. Remember that when you mirror files, the slower of the two cards can become the limit, so pairing two fast UHS-II cards gives the best result. If you want to browse options, search for UHS-II V90 SD cards from established brands such as SanDisk, Lexar or ProGrade Digital, which are known names in photography.

Avoiding Fakes and Failures

Counterfeit memory cards are a real problem on marketplaces, with fake capacity and low real speeds. Buy from a reputable seller, check that the card matches the packaging details and run a full-capacity test when it arrives. Format cards in the camera, not on a computer, so the file system matches what the camera expects. Replace cards that begin to show errors, and never fill a card to the last megabyte before swapping it.

Keep a few spares in a protective case, and consider a good UHS-II SD card reader too. A slow reader wastes the speed you paid for when copying files to your computer.

A few habits extend the life of any card. Turn the camera off before removing a card, avoid swapping cards in dusty or wet conditions and keep unused cards in a case so the contacts stay clean. The write-protect switch on the side of an SD card can also be handy for locking a card after you have copied its contents, which prevents accidental deletion. Remember that a card in the slot may be slightly warm after long bursts or video; let it cool before handling in hot weather.

It also helps to label your cards and keep a simple routine: copy files to two places before you format, verify that the copy opened correctly, and only then clear the card in camera. Many photographers learn this after losing a shoot to a corrupted card. If a card ever fails to read, stop using it immediately and avoid writing to it, since continued use can reduce the chance of recovering files with software.

Finally, set your expectations about marketing numbers. A card that lists a very high read speed may write far slower, and the two figures can differ by a wide margin. Look for the manufacturer’s stated minimum sustained write speed or a video class marking. Independent reviews from photography sites that measure real write speeds are often more useful than the packaging.

Frequently Asked Questions

Can I use a UHS-I card in the OM-1?

Yes, it will work, but you may notice slower buffer clearing during fast bursts. If you shoot action, UHS-II is the better match.

Is V90 necessary?

Not for most photographers. V90 offers a higher guaranteed floor, which helps with demanding video, but V60 covers many needs.

Should I buy one big card or several smaller ones?

Several moderate cards spread the risk. If one fails or gets lost, you lose less. Use the second slot as a live backup when the images matter.