It's definitely harder (much harder) to discern differences at longer subject
to camera distances, but it's still there. Perhaps for practical purposes,
there is little difference between lenses.
But I still see a discernable difference between the best and worst bokeh
lenses in your bunch at the longer distances (85-250 = best, 50-250 = worst).
I'm also struck by how disturbing the 50-250 is in the first set.
Skip
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Please reply to skipwilliams at pobox.com
I might not notice personal emails to this address
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>
>Subject: Re: [OM] Good bokah, bad bokah?
> From: "C.H.Ling" <chling@xxxxxxxxxxxxx>
> Date: Fri, 2 May 2003 23:08:31 +0800
> To: <olympus@xxxxxxxxxxxxxxx>
>
>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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