Head to head · specs cited · drawn to scale

Nikon FM2n vs Olympus OM-1 (film)

Every spec below is quoted from the makers' official pages — where a figure isn't published we say so rather than guess. Sizes are drawn at true relative scale from published dimensions, and the bag-fit row is computed against our measured bag catalog.

The 3 biggest published differences

Weight (body): the OM-1 leads at 490 g vs the FM2n's 540 g.
Lens mount: FM2n has Nikon F; OM-1 has Olympus OM.
Released: FM2n has 1984-2001; OM-1 has 1972-1988.

	FM2n Nikon F	OM-1 Olympus OM
Overview
Type	35mm SLR	35mm SLR
Format	35mm	35mm
Lens mount	Nikon F	Olympus OM
Released	1984-2001	1972-1988
Film camera
Film format	35mm	35mm
Metering	Center-weighted TTL full-aperture metering, EV 1 to 18 at ISO 100 with f/1.4 lens	Through-the-lens CdS exposure meter, needle in viewfinder, center-weighted
Shutter	Mechanical, titanium vertical-travel focal-plane, manual exposure only	Horizontal-travel focal-plane shutter, fully mechanical
Shutter speeds	Mechanical 1/4000 to 1 second plus B; FM2n raised flash sync to 1/250 sec vs 1/200 on the original FM2	B, 1 sec to 1/1000 sec
Battery	1x 3V CR1/3N lithium, or 2x 1.55V SR44 silver-oxide, or 2x 1.5V LR44 alkaline	1x 1.35V mercury cell (originally PX625, meter only; camera fires without battery)
Body & Handling
Dimensions (W×H×D)	142.5 × 90 × 60 mm	136 × 83 × 50 mm
Weight (body)	540 g	490 g
Weather sealing	—, not published	—, not published
Shutter durability	—, not published	—, not published
Price
Launch price	—, not published	—, not published
Size, to scale
Front view, drawn at the same scale from each maker's published W×H (mm).
Smallest bag that fits
Body	Think Tank Mirrorless Mover 20 V2 Fits body only · View at B&H Photo Video	Think Tank Mirrorless Mover 20 V2 Fits body only · View at B&H Photo Video

Sources

official · FM2n specifications: Nikon official spec page (imaging.nikon.com, archived 2018) — page titled "Nikon FM2"; body chassis/dimensions are shared with the New FM2 (FM2n) · accessed 2026-07-10

“Dimensions (W x H x D) Approx. 142.5 x 90 x 60mm (5.6 x 3.5 x 2.4 in.) / Weight (body only without batteries) Approx. 540g (19 oz.)”

official · OM-1 specifications: camera-wiki.org (dimensions corroborated by an original Olympus OM-1 brochure PDF at mattsclassiccameras.com, but that PDF is a scanned image with no extractable text; no official Olympus museum page could be reached) · accessed 2026-07-10

“136×83×50 mm (5.4×3.3×2.0 in) ... 490 g (17 oz) (OM-1); 510 g (18 oz) (OM-1n)”

OM-1 dimensions carry medium confidence (archived-source caveat on its fit page).

Open in the comparator (add a 3rd/4th body) Bags for the FM2n Bags for the OM-1 Fit checker

Spec values are the manufacturers' published figures, compared factually — we don't rank cameras. Fit verdicts are planning estimates from published interior dimensions, not guarantees. See methodology.

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