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Thread: Extension Tube Test shots

  1. #21
    Senior Member hanqiang1011's Avatar
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    Default Re: Extension Tube Test shots

    Quote Originally Posted by yehosaphat View Post
    Definitely important for macro even if you have macro lens. Just stack them up and shoot!
    With all 3 tubes mounted together with the lens; eg: Tamron 17-35mm plus the 3 tubes, can my Tamron 17-35 still function as a normal lens as per without tubes.

  2. #22
    Senior Member Leong23's Avatar
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    Default Re: Extension Tube Test shots

    Quote Originally Posted by hanqiang1011 View Post
    With all 3 tubes mounted together with the lens; eg: Tamron 17-35mm plus the 3 tubes, can my Tamron 17-35 still function as a normal lens as per without tubes.
    With extension tube, your lens will unable unable to focus infinity.

  3. #23
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    Default Re: Extension Tube Test shots

    Quote Originally Posted by hanqiang1011 View Post
    With all 3 tubes mounted together with the lens; eg: Tamron 17-35mm plus the 3 tubes, can my Tamron 17-35 still function as a normal lens as per without tubes.
    Nope.
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  4. #24
    Senior Member giantcanopy's Avatar
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    Default Re: Extension Tube Test shots

    Quote Originally Posted by Leong23 View Post
    But avoid stacking too much as it will cause diffraction as shown in the last two photo.
    Actually at that level of stacking i would not be too worried about diffraction. I have stacked several extension tubes with sharp images as long as one can find the focus. manually.

    With only 136mm of extension

    #1


    This was less than the first ( i cannot remember how many tubes i added for this )

    #2


    This is a shot with 446mm worth of extension with a 55mm micro of the greenback
    No sharpening, slightly soft but I do not think i have achieved the critical focus yet.

    #3


    Ryan

  5. #25
    Senior Member Leong23's Avatar
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    Default Re: Extension Tube Test shots

    Sorry, IMHO, it is not sharp.

  6. #26

    Default Re: Extension Tube Test shots

    may i ask

    wad else can we shoot wif extension tube ? other then macro?

  7. #27
    Senior Member Leong23's Avatar
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    Default Re: Extension Tube Test shots

    Quote Originally Posted by junniee View Post
    may i ask

    wad else can we shoot wif extension tube ? other then macro?
    anything. Extension tube just able you to reduce the minimum focusing distance.

  8. #28
    Senior Member Leong23's Avatar
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    Default Re: Extension Tube Test shots

    Quote Originally Posted by giantcanopy View Post
    Actually at that level of stacking i would not be too worried about diffraction. I have stacked several extension tubes with sharp images as long as one can find the focus. manually.

    With only 136mm of extension


    This was less than the first ( i cannot remember how many tubes i added for this )


    This is a shot with 446mm worth of extension with a 55mm micro of the greenback
    No sharpening, slightly soft but I do not think i have achieved the critical focus yet.

    Ryan
    For sharpness, i don't just referring to photo purely for web posting.

    Sharpness also must include preserving detail

    some example

    #1 Photo (no cropping, no sharpening)


    #2 Same photo as above (heavy cropped, no sharpening)

  9. #29
    Senior Member Leong23's Avatar
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    Default Re: Extension Tube Test shots

    Of course Extension tube is very valuable if uses moderately.

    This photo i had posted before, using 200mm Macro with 36mm Extension Tube.

    Last edited by Leong23; 11th January 2008 at 03:26 AM.

  10. #30
    Senior Member Leong23's Avatar
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    Default Re: Extension Tube Test shots

    Some layman term on diffraction.

    Diffraction is happening when light is travelling through the lens.

    The glass elements inside the lens help to control diffraction
    (that way pro lense is sharper - more lens elements)

    When stack with too much extension tube hence creating a big void with no glass elements, the light will run wild and some never make it to the sensor (loss of detail in photo)
    Last edited by Leong23; 11th January 2008 at 02:25 AM.

  11. #31
    Senior Member hanqiang1011's Avatar
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    Default Re: Extension Tube Test shots

    Quote Originally Posted by Leong23 View Post
    With extension tube, your lens will unable unable to focus infinity.
    But can function normally shooting group photos?

  12. #32
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    Default Re: Extension Tube Test shots

    Quote Originally Posted by hanqiang1011 View Post
    But can function normally shooting group photos?
    you don't look like a newbie, but your question is very funny.

    extension tube as we all know, makes a lens possible for closer focusing aka reducing the minimum focusing distance, in such, create magnification.

    as compared to macro lenses, macro lenses have full range of focusing distance from 1:1 to infinity, but normal lenses have a much further minimum focusing distance then to infinity.

    So if add extension tube to normal lenses, makes it function like a macro lens but minus the infinity.

    your 1st question, i wonder why would anyone wanna put extension tube on a wide angle lens. Wide angle lens already have the ability to focus a shorter distance in MFD as compared to normal lenses. normally an extension tube is attached to lenses more than 50mm. thats the norm.

    And i wonder how would you be able to take group shots with an extension tube, you get close, and you want wide angle?
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  13. #33
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    Default Re: Extension Tube Test shots

    Quote Originally Posted by hanqiang1011 View Post
    But can function normally shooting group photos?
    Unfortunately NO

  14. #34
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    Default Re: Extension Tube Test shots

    Quote Originally Posted by Del_CtrlnoAlt View Post
    you don't look like a newbie, but your question is very funny.

    extension tube as we all know, makes a lens possible for closer focusing aka reducing the minimum focusing distance, in such, create magnification.

    as compared to macro lenses, macro lenses have full range of focusing distance from 1:1 to infinity, but normal lenses have a much further minimum focusing distance then to infinity.

    So if add extension tube to normal lenses, makes it function like a macro lens but minus the infinity.

    your 1st question, i wonder why would anyone wanna put extension tube on a wide angle lens. Wide angle lens already have the ability to focus a shorter distance in MFD as compared to normal lenses. normally an extension tube is attached to lenses more than 50mm. thats the norm.

    And i wonder how would you be able to take group shots with an extension tube, you get close, and you want wide angle?
    I know somebody like to use wideangle for macro shoot due to the perspective. However, it is apparently not what he mean to

  15. #35
    Senior Member Leong23's Avatar
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    Default Re: Extension Tube Test shots

    Quote Originally Posted by hanqiang1011 View Post
    But can function normally shooting group photos?
    Maybe you should explain more, don't really understand your question......

  16. #36

    Default Re: Extension Tube Test shots

    it seem extension tube and +closeup filter work the same way..

    how come the price so different ?

    is it extension tube give more closer range? give quality foto then closeup filter???

  17. #37
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    Default Re: Extension Tube Test shots

    A good quality closeup filter such as the Canon 500D will cost almost the same as a set of third party tubes. Closeup filters do not cause any light loss and are best used with longer focal length lenses. Its a filter so it only screws onto similar diameter lenses.

    Extension tubes can be used with any lens and the major disadvantage is light loss and if stacked, diffraction can be a big issue.

    IMHO, a dedicated macro lens is still the way to go. A secondhand Tamron 90 or Sigma 105 costs not much more than a Canon 500D but offers a way higher mag rate and top image quality.

  18. #38
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    Default Re: Extension Tube Test shots

    Quote Originally Posted by junniee View Post
    it seem extension tube and +closeup filter work the same way..

    how come the price so different ?

    is it extension tube give more closer range? give quality foto then closeup filter???
    Confirm different. One has lens element that will affect pic quality, the other has light loss issue. To me, I prefer having light loss issue than pic quality and in addition, tubes are screw size indept! Of course, ideally, dedicated macro lens is best
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  19. #39

    Default Re: Extension Tube Test shots

    oh i see...

    but wad is light loss??

    underexposure???

  20. #40
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    Default Re: Extension Tube Test shots

    Quote Originally Posted by junniee View Post
    oh i see...

    but wad is light loss??

    underexposure???
    do deal with the light loss, you now have a slower shutter speed, which is challenging in macro when apertures get stopped down a lot.

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