The Canon EF 50mm f/1.8 II is the most affordable lens in the Canon EF line-up. Its optical design has not been changed since the dawn of the EOS system but Canon simplified the construction from the mk I lens in the early 90s.
| Date introduced | December 1990 |
|---|---|
| Maximum format size | 35mm full frame |
| Focal length | 50mm |
| 35mm equivalent focal length (APS-C) | 80mm |
| Diagonal Angle of view (FF) | 47º |
| Diagonal Angle of view (APS-C) | 31º |
| Maximum aperture | F1.8 |
| Minimum aperture | F22 |
| Lens Construction | • 6 elements / 5 groups |
| Number of diaphragm blades | 5 |
| Minimum focus | 0.45m (1.5 ft) |
| Maximum magnification | 0.15x |
| AF motor type | DC Micro Motor |
| Focus method | Unit focus |
| Image stabilization | • None |
| Filter thread | • 52mm • Does not rotate on focus |
| Supplied accessories | Front and rear caps |
| Optional accessories | ES-62 hood |
| Weight | 130g (4.6 oz) |
| Dimensions | 68.2mm diameter x 50.5mm length (2.7 x 2.0 in) |
| Lens Mount | Canon EF only |
Sharpness
The 50mm F1.8 is sharp in the centre even at F1.8, but the corners (and much of the rest of the frame) are very soft. Corners sharpen up progressively on stopping down, and by F5.6 look very good indeed. The very best performance is at F8, where this sub-$100 lens produces truly superb results right across the frame.
Chromatic Aberration
Lateral CA is extremely low, and even on the EOS-1Ds Mark III there's no visible fringing. There's also only a very slight level of colour blur due to spherical aberration - overall nothing of any real-world consequence.
Falloff
We consider falloff to become perceptible when the corner illumination falls to more than 1 stop less than the centre. The 50mm F1.8 II behaves much like any similar lens on full-frame; there's significant vignetting (2.7 stops) wide open, but this disappears progressively on stopping down and is insignificant by F3.5.
Distortion
Distortion on full frame is about 1.2% barrel; just a hair less than the 50mm F1.4 USM, and potentially visible in the occasional shot with straight lines right across the frame (although scarcely problematic, and easy enough to fix in software).
Conclusion
- Excellent image quality when stopped down
- Essentially no lateral chromatic aberration
- Extremely cheap
- Extremely cheaply built
- Harsh and distracting bokeh due to pentagonal aperture
- Vignetting at wide apertures on full frame (which only disappears at F3.5)
- Inconsistent autofocus in low light (most problematic when using large apertures)
 |
| Taken from http://www.pbase.com |
 |
| Taken from http://www.the-digital-picture.com |
1 komentar:
Thanks for review, it was excellent and very informative.
lens 50mm f 1.8 cheap but amazing lens bokeh
thank you :)
Post a Comment