OM System OM-1 Mark II recording time and file size

How much fits on each card, for all 15 recording modes OM System publishes. Bitrates checked November 11, 2026.

Ask about the OM System OM-1 Mark II

Key facts

Recording media: SDXC (UHS-II), dual slots
Published recording modes: 15 normal
Highest bitrate: 202 Mbps: MOV H.264 Long GOP C4K at 50p / 59.94p (4:2:0 8-bit)
Lightest 4K mode: 77 Mbps: MOV H.265 Long GOP C4K at 23.98p / 24p / 25p / 29.97p (4:2:0 10-bit)
Card for the top mode: V30
128 GB card at 4K 30p: 2 hr 38 min in MOV H.264 Long GOP 4K at 29.97p (4:2:0 8-bit, 102 Mbps)
Top frame rate (normal video): 59.94p at DCI 4K, 4K and 1080p
Slow motion (in camera): Not published by OM System

"4K 30p" means the highest-bitrate 4K UHD mode at 29.97p or 30p that a V30 card can record (240 Mbps or less). If there is no 30p, we use 25p, then 24p.

Quick answer

A 128 GB card holds about 2 hr 38 min of MOV H.264 Long GOP 4K at 29.97p (4:2:0 8-bit, 102 Mbps) on the OM System OM-1 Mark II. The heaviest mode, MOV H.264 Long GOP C4K at 50p / 59.94p (4:2:0 8-bit, 202 Mbps), uses 90.9 GB per hour, so the same card lasts 1 hr 20 min. The lightest 4K mode (77 Mbps) fits 3 hr 30 min.

Open the OM System OM-1 Mark II in the calculator

Set your shoot length, number of cameras and upload speed to see total storage and cards needed.

Recording time by mode

Every normal recording mode OM System lists, grouped by resolution and frame rate. Times are continuous recording on one card.

Format	Color	BitrateMbps	Per hourGB	64 GBcard	128 GBcard	256 GBcard	512 GBcard	Card speed
DCI 4K 4096x2160
24p / 23.98p
MOV H.264 Long GOP C4K	4:2:0 8-bit	102	45.9	1h 19m	2h 38m	5h 17m	10h	V30
MOV H.265 Long GOP C4K	4:2:0 10-bit	77	34.7	1h 45m	3h 30m	7h 1m	14h	V30
29.97p / 25p
MOV H.264 Long GOP C4K	4:2:0 8-bit	102	45.9	1h 19m	2h 38m	5h 17m	10h	V30
MOV H.265 Long GOP C4K	4:2:0 10-bit	77	34.7	1h 45m	3h 30m	7h 1m	14h	V30
59.94p / 50p
MOV H.264 Long GOP C4K	4:2:0 8-bit	202	90.9	40m	1h 20m	2h 40m	5h 21m	V30
MOV H.265 Long GOP C4K	4:2:0 10-bit	152	68.4	53m	1h 46m	3h 33m	7h 6m	V30
4K 3840x2160
23.98p
MOV H.264 Long GOP 4K	4:2:0 8-bit	102	45.9	1h 19m	2h 38m	5h 17m	10h	V30
MOV H.265 Long GOP 4K	4:2:0 10-bit	77	34.7	1h 45m	3h 30m	7h 1m	14h	V30
29.97p / 25p
MOV H.264 Long GOP 4K4K 30p pick	4:2:0 8-bit	102	45.9	1h 19m	2h 38m	5h 17m	10h	V30
MOV H.265 Long GOP 4K	4:2:0 10-bit	77	34.7	1h 45m	3h 30m	7h 1m	14h	V30
59.94p / 50p
MOV H.264 Long GOP 4K	4:2:0 8-bit	202	90.9	40m	1h 20m	2h 40m	5h 21m	V30
MOV H.265 Long GOP 4K	4:2:0 10-bit	152	68.4	53m	1h 46m	3h 33m	7h 6m	V30
1080p 1920x1080
23.98p
MOV H.264 ALL-I FHD	4:2:0 8-bit	202	90.9	40m	1h 20m	2h 40m	5h 21m	V30
MOV H.265 ALL-I FHD	4:2:0 10-bit	82	36.9	1h 38m	3h 17m	6h 35m	13h	V30
MOV H.264 Long GOP FHD	4:2:0 8-bit	27	12.2	5h	10h	20h	40h	V30
MOV H.265 Long GOP FHD	4:2:0 10-bit	22	9.9	6h 8m	12h	24h	49h	V30
29.97p / 25p
MOV H.264 ALL-I FHD	4:2:0 8-bit	202	90.9	40m	1h 20m	2h 40m	5h 21m	V30
MOV H.265 ALL-I FHD	4:2:0 10-bit	82	36.9	1h 38m	3h 17m	6h 35m	13h	V30
MOV H.264 Long GOP FHD	4:2:0 8-bit	27	12.2	5h	10h	20h	40h	V30
MOV H.265 Long GOP FHD	4:2:0 10-bit	22	9.9	6h 8m	12h	24h	49h	V30
59.94p / 50p
MOV H.265 ALL-I FHD	4:2:0 10-bit	162	72.9	50m	1h 40m	3h 20m	6h 40m	V30
MOV H.264 Long GOP FHD	4:2:0 8-bit	52	23.4	2h 35m	5h 11m	10h	20h	V30
MOV H.265 Long GOP FHD	4:2:0 10-bit	42	18.9	3h 13m	6h 26m	12h	25h	V30

GB per hour = bitrate in Mbps x 0.45. Card times use 95% of the labelled size (formatting and file overhead). Card speed: V30 up to 240 Mbps, V60 up to 480, V90 up to 720, CFexpress above that. * OM System's stated minimum for that format, which is stricter than the bitrate alone needs. Scroll the table sideways on a phone.

Memory cards

Card types: SDXC (UHS-II), dual slots
OM System's card requirements: Not published by OM System

Recommended cards for the OM System OM-1 Mark II

OM System's own or recommended cards first, then the most-reviewed cards on B&H for this camera's media. SD cards show how many of this camera's modes they can record; for other cards, compare the speed with the requirements above.

SD, V30SanDisk 128GB Extreme PRO UHS-I SDXCHandles: Every normal recording mode (15)
Amazon B&H

We earn a commission if you buy through these store links, at no extra cost to you. It doesn't change which cards we list.

Slow motion

Not published by OM System

Questions

How long does a 128 GB card last in the OM System OM-1 Mark II?

From 1 hr 20 min in its heaviest mode to 12 hr in its lightest. In MOV H.264 Long GOP 4K at 29.97p (4:2:0 8-bit, 102 Mbps) it holds about 2 hr 38 min. Times use OM System's published bitrates and 95% of the card's labelled size.

What memory card does the OM System OM-1 Mark II need?

It records to SDXC (UHS-II), dual slots. For its top mode (202 Mbps) you need a V30 card or faster. Lighter modes work with slower cards; the table on this page lists the card speed for every mode.

How much storage does an hour of 4K take on the OM System OM-1 Mark II?

Between 34.7 GB and 90.9 GB per hour, depending on the format and bitrate. MOV H.264 Long GOP 4K at 29.97p (4:2:0 8-bit, 102 Mbps) uses 45.9 GB per hour.

Can the OM System OM-1 Mark II record slow motion in camera?

OM System does not publish an in-camera slow-motion mode for the OM System OM-1 Mark II.

Sources

Bitrates and card requirements: explore.omsystem.com/us/en/om-1-mark-ii
learning.omsystem.com/OM-1MarkII/zz_html_manual/en/memory_card_capacity_movies_332.html
Checked: November 11, 2026
How we calculate: GB per hour = Mbps x 0.45. Card time = 95% of the card size / GB per hour. Real files can differ by a few percent (audio track, file overhead, card format).

Spotted a wrong number? Tell us and we'll check it against OM System's documents.