Ok, originally I want to perform the test on 50mm first but I now I do it
for 200mm first, below is the result:
All lenses shoot at F5, around 1/5s, ISO400, custom white balance, no post
adjustment, no sharpening only resize.
Group A - background to object distance 20 inches, there are some details on
the background, can you see which lens has poorest bokeh?
http://www.accura.com.hk/OM/bokeh/180F2_8a.jpg
http://www.accura.com.hk/OM/bokeh/200F5a.jpg
http://www.accura.com.hk/OM/bokeh/200F4a.jpg
http://www.accura.com.hk/OM/bokeh/50250a.jpg
http://www.accura.com.hk/OM/bokeh/85250a.jpg
Group B - background to object distance 40 inches, the background are more
blur, can you see which lens has poorest bokeh?
http://www.accura.com.hk/OM/bokeh/180F2_8b.jpg
http://www.accura.com.hk/OM/bokeh/200F5b.jpg
http://www.accura.com.hk/OM/bokeh/200F4b.jpg
http://www.accura.com.hk/OM/bokeh/50250b.jpg
http://www.accura.com.hk/OM/bokeh/85250b.jpg
In your example, the background are much more blur, even the poorest lens
will provide the same result, there is no comparision possible.
I'm sorry to put the result here as some lenses owner will be very
disappointed on their lens once they praise it very much. BTW, this is
not the most critical test, the more critical one being a background with
bright illuminated grasses.
C.H.Ling
----- Original Message -----
From: "Skip Williams" <om@xxxxxxxxxxxxxxxx>
> On this I respectfully disagree. But that's just my opinion.
> >
> >Yes it is nice but you cannot use it to judge the lens has good bokeh
> >or not, because the out of focus is much more then the shot Gary
> >shown. In your case I guarantee all lenses can produce this kind of
> >bokeh.
> >
> >C.H.Ling
> >
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