y*b
2 楼
"The Canon EF 50mm f/1.8 STM is a slight improvement over the old EF 50mm f/
1.8 II - more so mechanically rather than optically. Now the old EF 50mm f/1
.8 II was already a good lens actually especially when stopped down. The EF
50mm f/1.8 STM has a much higher center sharpness at fully open aperture
though. The low contrast in the image borders/corners remains an issue but
the resolution is quite decent here. Stopping down to f/2.8 helps to lift
the overall quality but the lens really shines between f/4 and f/8 where it
doesn't really get any better than that actually. The low CAs also
contribute to the high sharpness perception at medium aperture settings.
Just like its predecessor, it produces a hefty amount of vignetting at fully
open aperture. Some photographers are actually after such an effect e.g.
for portraits. However, otherwise you probably prefer to stop down a bit or
correct the issue during post-processing. Image distortions aren't
completely negligible but still very low. An unfortunate weakness of the
lens remains the bokeh. There's also some bokeh fringing at large apertures
but this is nothing out of the ordinary actually.
The build quality has been substantially improved. While it remains a light-
weight lens, it doesn't feel like a toy anymore. Canon is using high quality
plastics based on a metal mount and there's a decent focus ring now.
Whether the new STM AF is an improvement or not may be debatable. While we
haven't taken any formal measurements here, the AF doesn't seem to be any
faster than on the EF 50mm f/1.8 II. However, the noise during focus
operations has been reduced and full-time manual focusing is now also
possible.
Thus the Canon EF 50mm f/1.8 STM is certainly a worthy successor of the EF
50mm f/1.8 II but they aren't worlds apart either."
http://www.photozone.de/canon_eos_ff/905-canon_50_18stm?start=2
1.8 II - more so mechanically rather than optically. Now the old EF 50mm f/1
.8 II was already a good lens actually especially when stopped down. The EF
50mm f/1.8 STM has a much higher center sharpness at fully open aperture
though. The low contrast in the image borders/corners remains an issue but
the resolution is quite decent here. Stopping down to f/2.8 helps to lift
the overall quality but the lens really shines between f/4 and f/8 where it
doesn't really get any better than that actually. The low CAs also
contribute to the high sharpness perception at medium aperture settings.
Just like its predecessor, it produces a hefty amount of vignetting at fully
open aperture. Some photographers are actually after such an effect e.g.
for portraits. However, otherwise you probably prefer to stop down a bit or
correct the issue during post-processing. Image distortions aren't
completely negligible but still very low. An unfortunate weakness of the
lens remains the bokeh. There's also some bokeh fringing at large apertures
but this is nothing out of the ordinary actually.
The build quality has been substantially improved. While it remains a light-
weight lens, it doesn't feel like a toy anymore. Canon is using high quality
plastics based on a metal mount and there's a decent focus ring now.
Whether the new STM AF is an improvement or not may be debatable. While we
haven't taken any formal measurements here, the AF doesn't seem to be any
faster than on the EF 50mm f/1.8 II. However, the noise during focus
operations has been reduced and full-time manual focusing is now also
possible.
Thus the Canon EF 50mm f/1.8 STM is certainly a worthy successor of the EF
50mm f/1.8 II but they aren't worlds apart either."
http://www.photozone.de/canon_eos_ff/905-canon_50_18stm?start=2
x*k
3 楼
我觉得对焦拉风箱少一些了，还是有进步的。
f/
/1
EF
it
fully
【在 y*b 的大作中提到】
: "The Canon EF 50mm f/1.8 STM is a slight improvement over the old EF 50mm f/
: 1.8 II - more so mechanically rather than optically. Now the old EF 50mm f/1
: .8 II was already a good lens actually especially when stopped down. The EF
: 50mm f/1.8 STM has a much higher center sharpness at fully open aperture
: though. The low contrast in the image borders/corners remains an issue but
: the resolution is quite decent here. Stopping down to f/2.8 helps to lift
: the overall quality but the lens really shines between f/4 and f/8 where it
: doesn't really get any better than that actually. The low CAs also
: contribute to the high sharpness perception at medium aperture settings.
: Just like its predecessor, it produces a hefty amount of vignetting at fully
f/
/1
EF
it
fully
【在 y*b 的大作中提到】
: "The Canon EF 50mm f/1.8 STM is a slight improvement over the old EF 50mm f/
: 1.8 II - more so mechanically rather than optically. Now the old EF 50mm f/1
: .8 II was already a good lens actually especially when stopped down. The EF
: 50mm f/1.8 STM has a much higher center sharpness at fully open aperture
: though. The low contrast in the image borders/corners remains an issue but
: the resolution is quite decent here. Stopping down to f/2.8 helps to lift
: the overall quality but the lens really shines between f/4 and f/8 where it
: doesn't really get any better than that actually. The low CAs also
: contribute to the high sharpness perception at medium aperture settings.
: Just like its predecessor, it produces a hefty amount of vignetting at fully
l*y
4 楼
对焦稳定性高些就可以了，这价格还求什么。
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