Production
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Country
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Optical
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Updated
Jul 16, 2026
Mamiya Sekor C 80mm f/1.9 (645)
Mamiya 645 · 80mm · f/1.9
Compiled from 2 real reviews · AI-assisted · accuracy-checked · Updated 16 Jul 2026
Overview
The Mamiya Sekor C 80mm f/1.9 is the fastest standard lens ever made for 645 medium format. While most medium format standard lenses top out at f/2.8, Mamiya pushed to f/1.9 — an extraordinary achievement for the larger image circle. This lens was the reason many portrait photographers chose the Mamiya 645 system. The shallow depth of field at f/1.9 on medium format creates a three-dimensional rendering that no 35mm lens can match.
Verdict: A medium format legend. The f/1.9 aperture on 645 delivers depth-of-field separation that modern full-frame lenses still struggle to replicate. Heavy and demanding, but the results are unforgettable.
Optical Character
Bokeh
Exceptional bokeh, with a beautiful soft background blur due to the wide f/1.9 aperture.
Community Insights
What people love
- Unique medium format rendering
- f/1.9 speed in 645 format
- Beautiful portrait bokeh
- Solid all-metal construction
What people dislike
- Very heavy for a standard lens
- Soft wide open
- Expensive and rising in price
- Limited to Mamiya 645 system
Pro Tips
- f/2.8 is the sweet spot for portraits — still shallow but much sharper
- The 645 format with f/1.9 gives roughly equivalent DoF to f/1.0 on full frame
- Check for balsam separation which is common in older examples
Sample Photos
Sources (2)
republicofla.com
Curated heritage archive
A medium format legend. The f/1.9 aperture on 645 delivers depth-of-field separation that modern full-frame lenses still struggle to replicate. Heavy and demanding, but the results are unforgettable.