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Thread: Bokeh

  1. #1
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    Bokeh

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    Hi,
    Got myself a Tamron 17-50mm f2.8. Tested it's bokeh at 50mm f2.8.
    I read from cs that bokeh improve with extension tube.
    Not sure about that so I put it to a test. The second picture is taken with a 12mm extension tube and
    I think it's bokeh is better, but the downside is, can only shoot macro and it cannot focus at infinity.
    What do you guys think?

    #1.

    #2. with extension tube.
    ******
    Richard
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    Canon 20D 100mm Macro EF-S 18-55mm EF-S 55-250mm EF-400mm f5.6 Speedlite 550EX 2x420EX ST-E2
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  2. #2
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    I am not sure if you can exactly say that the bokeh is better. I mean with an extention tube basically you are bringing the image closer to you and larger, almost like a magnifying glass... so basically your "bokeh" also enlarges hence looking nicer. no??

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    bokeh is an immeasurable quality, it comes in grades such as eww, yucks, terrible, not bad, ok, nice, ooo, wow, creamy!, sibeh smooth, etc etc.

    yours (both cases) is some where near the beginning of the list

    if I may add, for a premium* constant ƒ/2.8 zoom (any constant fast zoom should be a premium lens) this bokeh would have struck it off my list right away. I mean why spend the money and lug the weight around to suffer this kind of performance?
    Last edited by Wackytpt; 3rd Aug 2008 at 22:02.
    why I don't do garden hybrids and aquarium strains: natural species is a history of Nature, while hybrids are just the whims of Man.
    hexazona · crumenatum · Galleria Botanica

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    Thumbs down

    Quote Originally Posted by hwchoy View Post
    bokeh is an immeasurable quality, it comes in grades such as eww, yucks, terrible, not bad, ok, nice, ooo, wow, creamy!, sibeh smooth, etc etc.

    yours (both cases) is some where near the beginning of the list
    well, credit must be given to Tamron
    I didn't like it too, just wanted to see the difference with and without an extension tube.
    Thanks for your comments
    ******
    Richard
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    Canon 20D 100mm Macro EF-S 18-55mm EF-S 55-250mm EF-400mm f5.6 Speedlite 550EX 2x420EX ST-E2
    http://www.trident.smugmug.com/

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    wondering if canon's EFS 17-55mm f/2.8 bokeh will be good ?
    Chee Yong

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    Quote Originally Posted by trident View Post
    well, credit must be given to Tamron
    I didn't like it too, just wanted to see the difference with and without an extension tube.
    Thanks for your comments
    why give credit to tamron?
    why I don't do garden hybrids and aquarium strains: natural species is a history of Nature, while hybrids are just the whims of Man.
    hexazona · crumenatum · Galleria Botanica

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    they made the lens
    or should it be
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    Richard
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    Canon 20D 100mm Macro EF-S 18-55mm EF-S 55-250mm EF-400mm f5.6 Speedlite 550EX 2x420EX ST-E2
    http://www.trident.smugmug.com/

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    Richard,
    Correct me if I'm wrong.. I think if you want better bokeh f2 stop and below will be better than 2.8.
    Corydoras & Pleco Community Biotope Tank Planted Tank Journal
    Keeping fish as pets can be a rewarding hobby.
    Designing and maintaining your aquariums is a wonderful creative outlet.
    Watching your fish swim around is both relaxing and fun.

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    get rid of it ASAP!

    Quote Originally Posted by doubleace View Post
    Richard,
    Correct me if I'm wrong.. I think if you want better bokeh f2 stop and below will be better than 2.8.
    what do you mean? the lens is only max ƒ/2.8
    Last edited by Wackytpt; 3rd Aug 2008 at 22:03.
    why I don't do garden hybrids and aquarium strains: natural species is a history of Nature, while hybrids are just the whims of Man.
    hexazona · crumenatum · Galleria Botanica

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    Quote Originally Posted by hwchoy View Post
    what do you mean? the lens is only max ƒ/2.8
    I mean lens that with f2 and below will be better than lens with f2.8 stop.
    Corydoras & Pleco Community Biotope Tank Planted Tank Journal
    Keeping fish as pets can be a rewarding hobby.
    Designing and maintaining your aquariums is a wonderful creative outlet.
    Watching your fish swim around is both relaxing and fun.

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    I would worry more about the portion of the image that is in focus that the other portion that is out of focus.

    Cheers,
    I have dwarf cichlids in my tanks! Do you?

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    I would agree for photo documentation, but for photography it is the overall image that is important, which includes the out of focus porrtion.
    why I don't do garden hybrids and aquarium strains: natural species is a history of Nature, while hybrids are just the whims of Man.
    hexazona · crumenatum · Galleria Botanica

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    Andy,
    Yes do agree that a bigger aperture will give a better bokeh, but most important is the built of the lens. The number of blades plays a very important part too. Choy will be able to explain further. Anyway the Tamron 17-50mm biggest aperture is f2.8.

    Choy,
    Get rid of it? No lah, no so rich.
    I use this lens mainly for my company events, family gatherings, BBQ.....etc

    Benny,
    Thanks. Currently the overall image quality is important as the viewers are my boss, my wife, kids, office colleagues and relatives. And of course for them the image quality, which is the part in focus, is more important than the bokeh.
    ******
    Richard
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    http://www.trident.smugmug.com/

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    Quote Originally Posted by trident View Post
    And of course for them the image quality, which is the part in focus, is more important than the bokeh.


    absolutely not. image quality is not just the part in focus. the layman do not realise the bad bokeh is affecting their perception of the overall image, but they can and will prefer the same subject with a nice bokeh over a bad one. bad bokeh distracts from the subject and fights for attention (just as in your example).

    I mean if you want to just shoot casually then any lens will do, in fact a point and shoot might even do better, these days they have face recognition AF! but if you care about improving and learning photography then this is a very important consideration. once your eyes are trained to pick out bokeh you will realise what it is that has been bothering you about certain pictures, and why others are so "nice".


    search this forum for bokeh, and google for it. there are a few very good articles in luminous landscape and such sites.
    why I don't do garden hybrids and aquarium strains: natural species is a history of Nature, while hybrids are just the whims of Man.
    hexazona · crumenatum · Galleria Botanica

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    Choy.. we all know what you are saying.. but you must also read..that richard said "FOR THEM...".

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    I know, I'm trying to help him ditch his lens years later when he look back at his masses of precious pix with bad bokeh, he will thank me
    why I don't do garden hybrids and aquarium strains: natural species is a history of Nature, while hybrids are just the whims of Man.
    hexazona · crumenatum · Galleria Botanica

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    Quote Originally Posted by hwchoy View Post
    I know, I'm trying to help him ditch his lens years later when he look back at his masses of precious pix with bad bokeh, he will thank me
    AH yo !!!!!

    HAHAHAHA !!!!!!!!!!

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    Bad Choy, down Choy! LOL. Although I agree with you!

    Sorry Richard, if you're going for shot's like these where bokeh is an important artistic quality[ newly defined in grades of "eww, yucks, terrible, not bad, ok, nice, ooo, wow, creamy!, sibeh smooth,"]

    I would plan to get a better one in near future if you consider photography an artistic extension of your mind. [am I evil...]

    Richard, If you use it only for functions I wouldn't be concerned as the quality is better than 'eww.' I've seen sharp 'O's lol.
    You can if you dare to fail - Stan Chung

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    at least find a better subject with a better background for the test. The test photo doesn't do justice to the lens

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    Stan, high five !!!
    why I don't do garden hybrids and aquarium strains: natural species is a history of Nature, while hybrids are just the whims of Man.
    hexazona · crumenatum · Galleria Botanica

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