Head to head · specs cited · drawn to scale
Mamiya M645 1000S vs Mamiya RB67 Pro-S
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 RB67 Pro-S's 2705 g.
- Format: M645 1000S has 120 (6×4.5); RB67 Pro-S has 120 (6×7).
- Lens mount: M645 1000S has Mamiya M645 bayonet mount; RB67 Pro-S has Mamiya RB bayonet mount (with safety lock ring).
M645 1000S Mamiya 645 mount | RB67 Pro-S Mamiya RB mount | |
|---|---|---|
| Overview | ||
| Type | Medium-format SLR | Medium-format SLR |
| Format | 120 (6×4.5) | 120 (6×7) |
| Lens mount | Mamiya M645 bayonet mount | Mamiya RB bayonet mount (with safety lock ring) |
| Released | 1976–c.1985 (M645 1000S variant) | 1974–1990 (Pro-S variant) |
| 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 (no built-in meter) |
| Shutter | Moving Coil Electronic Focal-Plane Shutter | Seiko #1 leaf (lens) shutter, 1 to 1/400 sec and T |
| Shutter speeds | B, 8 – 1/1000 sec | 1 – 1/400 sec, T |
| Battery | One 6V silver-oxide battery (4SR44) or 6V alkaline (4LR44) — powers the electronic shutter, not required for metering in this configuration | none (fully mechanical) |
| Body & Handling | ||
| Dimensions (W×H×D) | 99.3 × 100 × 166.5 mm | 104 × 144 × 228 mm |
| Weight (body) | 1570 g | 2705 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 | f-stop Shallow Medium ICU Fits body only · View at f-stop |
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 · 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)”
Open in the comparator (add a 3rd/4th body) Bags for the M645 1000S Bags for the RB67 Pro-S 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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