Head to head · specs cited · drawn to scale

Mamiya M645 1000S vs Pentax 6×7 / 67

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 M645 1000S leads at 1570 g vs the Pentax 6x7's 1760 g.
Format: M645 1000S has 120 (6×4.5); Pentax 6x7 has 120 (6×7).
Lens mount: M645 1000S has Mamiya M645 bayonet mount; Pentax 6x7 has Pentax smc67 bayonet mount (internal and external bayonets).

	M645 1000S Mamiya 645 mount	Pentax 6x7 Pentax 6x7 mount
Overview
Type	Medium-format SLR	Medium-format SLR
Format	120 (6×4.5)	120 (6×7)
Lens mount	Mamiya M645 bayonet mount	Pentax smc67 bayonet mount (internal and external bayonets)
Released	1976–c.1985 (M645 1000S variant)	1969–1989 (original 6×7, pre-"67" rename)
Film camera
Film format	120 (6×4.5)	120 (6×7)
Metering	none in base body (meterless Waist-Level Finder S configuration; metering only via optional PD/CdS Prism Finders)	none built-in (optional TTL metering pentaprism finder)
Shutter	Moving Coil Electronic Focal-Plane Shutter	Mechanical horizontal cloth focal-plane shutter
Shutter speeds	B, 8 – 1/1000 sec	1 sec – 1/1000 sec, X-sync 1/30 sec
Battery	One 6V silver-oxide battery (4SR44) or 6V alkaline (4LR44) — powers the electronic shutter, not required for metering in this configuration	none required for the mechanical shutter itself (4x LR44/SR44 or 1x 4SR44 battery only needed if the optional TTL metering finder is fitted)
Body & Handling
Dimensions (W×H×D)	99.3 × 100 × 166.5 mm	177 × 152 × 91 mm
Weight (body)	1570 g	1760 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 Retrospective 4 V2.0 Fits body only · View at B&H Photo Video	WANDRD Essential Camera Cube (for PRVKE 21) Fits body only · View at WANDRD

Sources

official · M645 1000S specifications: Mamiya M645 1000S original instruction manual (scan, Scribd-hosted; same manual as butkus.org/focale22.com scans) · accessed 2026-07-10

“Dimensions and Weight: (width, height, depth, w/80mm f/1.9 lens) (w/Waist-Level Finder S) (w/1.9 lens) 3-29/32" x 3-15/16" x 6-9/16" 55.4 oz (99.3 x 100 x 166.5mm) (1570 g) ... Standard Lenses: Mamiya-Sekor C (multi-coated) 80mm f/1.9, automatic diaphragm, with meter coupler, 67mm filter size”

official · Pentax 6x7 specifications: Photoethnography.com Classic Camera DB, "Technical Details" table (secondary compilation citing period technical specs, NOT a directly-sighted original Pentax manual page — the original manual PDFs at butkus.org/cameramanuals.org are scanned images with no extractable/OCR'd text, so this could not be independently verified against the primary document) · accessed 2026-07-10

“Dimensions and weight: 177x101x91mm 1.29kg w/o finder; 177x152x91mm 1.76kg w/ TTL finder [row for "6x7" model, 1969]”

Pentax 6x7 dimensions carry medium confidence (archived-source caveat on its fit page).

Open in the comparator (add a 3rd/4th body) Bags for the M645 1000S Bags for the Pentax 6x7 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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