TC or ExtensionTube

Discussion in 'Photography Beginners' Forum' started by Timppa, May 16, 2020.

  1. Timppa

    Timppa No longer a newbie, moving up!

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    I use a Tamron 90mm macro lens atm (for Nikon).
    I would like to get closer to the subject and I was wondering what way to go.. TC or ExtensionTubes (ET)?

    A TC14 would make it a 126mm and give more working distance for a 1:1 magnification. But what magnification would I get at closest focus?
    I feel a tc20 would reduce quality to much, and the tc14 I could also use on my 200-500mm. (I'm looking at kenko TC).
    How about ET? I feel these would be a lot harder to work with 'in the field', but will give even more magnification?


     
  2. tirediron

    tirediron Watch the Birdy! Staff Member Supporting Member

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    If you want to get closer to your subject / increase magnification, then you have two choices, either extension tubes or a reverse mount. Since you've already got a proper macro lens, a set of Kenko is going to be the most practical solution. Using a TC, especially on a long lens like a 200-500 is going to make your minimum working distance so far away as to render it useless. Besides which, with a 750 - 10000mm equivalent focal length, you're going to need one heck of a good tripod & head to hold that beast steady enough to take a shot at anything less than the highest shutter speeds.

    Simple rule: Extension tubes for close up / macro work, and TC to increase long-distance reach.
     
  3. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    Teleconverters generally don't change focus, so whatever minimum focus is sans the TC will be the minimum focus with it.
     
  4. Timppa

    Timppa No longer a newbie, moving up!

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    Alright, thanks for the quick answer.
    We shall go for ET then :)
     
  5. tirediron

    tirediron Watch the Birdy! Staff Member Supporting Member

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    You sure 'bout that Willis? I just tried a 1.7 on my 70-200 and MFD went from about 4' 9" to 6' 6" (give or take slightly).
     
  6. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    Generally.
     
  7. vStiles

    vStiles TPF Noob!

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    This isn't right. Changing the focal length, changes where your minimum focus sits.

    As well, TC's are another piece of glass between subject and sensor. If you don't get a top quality one, you'll never use it more than once.

    Extension tubes have no glass, and therefore, zero change to image quality. You can also stack ET's for more magnification. AND, you can use ET's on a non macro lens for the same effect.
     
  8. Timppa

    Timppa No longer a newbie, moving up!

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    I'm thinking kenko TC or ET.
    What would be the maths behind all of it?
    Would using a tc14 make it a 1.4:1 magnification ratio?
    And how many mm of ET would I need for the same? Would 45mm ET on my tamron 90mm macro make it 1.5:1 ratio?
     
  9. Original katomi

    Original katomi TPF Supporters Supporting Member

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    If you are going to buy a space being be sure to get a good one, the kendo sets are wort the extra.
    As for the maths..... Err as long as I get the effect from extension tubes I don’t worry about the maths
     
  10. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    A 1.4 TC simply multiplies your focal length by 1.4. So if you put it on a 100mm, it will become a 140mm. It has nothing to do with magnification ratios.
     
  11. Timppa

    Timppa No longer a newbie, moving up!

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    I like the maths xD

    Other people here say different :0

    If i can focus at 30cm of the subject and then add a TC to change my 90mm to a 126mm, but stil am able to focus at 30cm... Then I have a higher magnification. Right?
     
  12. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    Huh?

     

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