Head to head · specs cited · drawn to scale

Olympus OM-1 (film) vs Pentax K1000

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 K1000's 620 g.
Lens mount: OM-1 has Olympus OM; K1000 has Pentax K.
Released: OM-1 has 1972-1988; K1000 has 1976-1997.

	OM-1 Olympus OM	K1000 Pentax K
Overview
Type	35mm SLR	35mm SLR
Format	35mm	35mm
Lens mount	Olympus OM	Pentax K
Released	1972-1988	1976-1997
Film camera
Film format	35mm	35mm
Metering	Through-the-lens CdS exposure meter, needle in viewfinder, center-weighted	CdS TTL average metering (open-aperture, match-needle)
Shutter	Horizontal-travel focal-plane shutter, fully mechanical	Horizontal-travel, rubberized silk cloth focal-plane shutter, mechanical
Shutter speeds	B, 1 sec to 1/1000 sec	B, 1 sec to 1/1000 sec; flash X-sync 1/60 sec
Battery	1x 1.35V mercury cell (originally PX625, meter only; camera fires without battery)	1x LR44/SR44 1.5V (meter only; camera fires all speeds without battery)
Body & Handling
Dimensions (W×H×D)	136 × 83 × 50 mm	143 × 91.4 × 48 mm
Weight (body)	490 g	620 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 · 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)”

official · K1000 specifications: Wikipedia (figures consistent with widely-cited manual dimensions; original manual PDFs at butkus.org/cameramanuals.org/ManualsLib are scanned images with no extractable text, and no official Pentax/Ricoh museum spec page could be located) · accessed 2026-07-10

“It is 91.4 millimetres (3.6 inches) tall, 143 mm (5.6 in) wide, and 48 mm (1.9 in) deep, and weighs 620 grams (21.9 ounces).”

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

K1000 dimensions carry medium confidence (archived-source caveat on its fit page).

Open in the comparator (add a 3rd/4th body) Bags for the OM-1 Bags for the K1000 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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