Head to head · specs cited · drawn to scale
Mamiya M645 1000S vs Nikon FM2n
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 FM2n leads at 540 g vs the M645 1000S's 1570 g.
- Type: M645 1000S has Medium-format SLR; FM2n has 35mm SLR.
- Format: M645 1000S has 120 (6×4.5); FM2n has 35mm.
M645 1000S Mamiya 645 mount | FM2n Nikon F | |
|---|---|---|
| Overview | ||
| Type | Medium-format SLR | 35mm SLR |
| Format | 120 (6×4.5) | 35mm |
| Lens mount | Mamiya M645 bayonet mount | Nikon F |
| Released | 1976–c.1985 (M645 1000S variant) | 1984-2001 |
| Film camera | ||
| Film format | 120 (6×4.5) | 35mm |
| Metering | none in base body (meterless Waist-Level Finder S configuration; metering only via optional PD/CdS Prism Finders) | Center-weighted TTL full-aperture metering, EV 1 to 18 at ISO 100 with f/1.4 lens |
| Shutter | Moving Coil Electronic Focal-Plane Shutter | Mechanical, titanium vertical-travel focal-plane, manual exposure only |
| Shutter speeds | B, 8 – 1/1000 sec | Mechanical 1/4000 to 1 second plus B; FM2n raised flash sync to 1/250 sec vs 1/200 on the original FM2 |
| Battery | One 6V silver-oxide battery (4SR44) or 6V alkaline (4LR44) — powers the electronic shutter, not required for metering in this configuration | 1x 3V CR1/3N lithium, or 2x 1.55V SR44 silver-oxide, or 2x 1.5V LR44 alkaline |
| Body & Handling | ||
| Dimensions (W×H×D) | 99.3 × 100 × 166.5 mm | 142.5 × 90 × 60 mm |
| Weight (body) | 1570 g | 540 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 | Think Tank Mirrorless Mover 20 V2 Fits body only · View at B&H Photo Video |
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 · 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.)”
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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