Head to head · specs cited · drawn to scale

Mamiya RB67 Pro-S 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 K1000 leads at 620 g vs the RB67 Pro-S's 2705 g.
Type: RB67 Pro-S has Medium-format SLR; K1000 has 35mm SLR.
Format: RB67 Pro-S has 120 (6×7); K1000 has 35mm.

	RB67 Pro-S Mamiya RB mount	K1000 Pentax K
Overview
Type	Medium-format SLR	35mm SLR
Format	120 (6×7)	35mm
Lens mount	Mamiya RB bayonet mount (with safety lock ring)	Pentax K
Released	1974–1990 (Pro-S variant)	1976-1997
Film camera
Film format	120 (6×7)	35mm
Metering	none (no built-in meter)	CdS TTL average metering (open-aperture, match-needle)
Shutter	Seiko #1 leaf (lens) shutter, 1 to 1/400 sec and T	Horizontal-travel, rubberized silk cloth focal-plane shutter, mechanical
Shutter speeds	1 – 1/400 sec, T	B, 1 sec to 1/1000 sec; flash X-sync 1/60 sec
Battery	none (fully mechanical)	1x LR44/SR44 1.5V (meter only; camera fires all speeds without battery)
Body & Handling
Dimensions (W×H×D)	104 × 144 × 228 mm	143 × 91.4 × 48 mm
Weight (body)	2705 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	f-stop Shallow Medium ICU Fits body only · View at f-stop	Think Tank Mirrorless Mover 20 V2 Fits body only · View at B&H Photo Video

Sources

official · RB67 Pro-S specifications: Mamiya RB67 Pro-S original instruction manual (scan, Scribd-hosted; same text as cameramanuals.org/butkus.org scans) · accessed 2026-07-10

“Dimensions: (Camera body with roll film holder) Height: 5-21/32in. (144mm) Width: 4-3/32in. (104mm) Length: 8-31/32in. (228mm) (with 9Omm f/3.8 lens) 8-17/32in. (217mm) (with 127mm f/3.8 lens). Weight: Camera body with revolving adapter and focusing hood 3 lbs., 3-2/16 oz. (1450g); Pro-S roll film holder 15-14/16 oz. (450g); 90mm f/3.8 lens 28-6/16 oz. (805g); 127mm f/3.8 lens 26-7/16 oz. (750g)”

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).”

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

Open in the comparator (add a 3rd/4th body) Bags for the RB67 Pro-S 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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