Pentax smc FA 50mm F1.4 vs Pentax smc Pentax-FA 31mm f/1.8 AL Limited
Side-by-side comparison from our catalogue data. Better values are highlighted only where a clear difference exists.
Verdict at a glance
- Pentax smc FA 50mm F1.4 is faster by 0.7 stops (f/1.4 vs f/1.8), letting in more light.
- Pentax smc FA 50mm F1.4 is lighter by 130g.
- Pentax smc Pentax-FA 31mm f/1.8 AL Limited goes wider (31mm vs 50mm).
- Pentax smc FA 50mm F1.4 reaches further (50mm vs 31mm).
| Spec | smc FA 50mm F1.4 | smc Pentax-FA 31mm f/1.8 AL Limited |
|---|---|---|
| Brand | Pentax | Pentax |
| Mount | Pentax K | Pentax K |
| Type | Prime | Prime |
| Focal length | 50mm | 31mm (wider) |
| Max aperture | f/1.4 (faster) | f/1.8 |
| Weight g | 220 (lighter) | 350 |
| Filter mm | 49 | 58 |
| Length mm | 38.0 | 69.0 |
| Diameter mm | 64.0 | 66.0 |
| Min focus m | 0.45 | 0.3 (closer focusing) |
| Blades | n/a | 9 |
| Format | n/a | full-frame |
| Groups | n/a | 7 |
| Af motor | n/a | screw-drive |
| Elements | n/a | 9 |
| Max magnification | n/a | 0.16 |
Pentax smc FA 50mm F1.4
A compact 50mm f/1.4 for Pentax K-mount that covers full frame. It weighs about 220 g and takes 49mm filters.
Pros
- f/1.4 aperture
- Light at about 220 g
- Full-frame coverage
- 49mm filters
Cons
- Soft wide open
- Screw-drive autofocus
- Not weather sealed
Pentax smc Pentax-FA 31mm f/1.8 AL Limited
A celebrated wide-normal prime in Pentax's FA Limited trio. It covers full-frame film and digital.
Pros
- Excellent rendering
- All-metal build
- Full-frame coverage
Cons
- Not weather-sealed
- Limited availability