Difference between extension tube & TC

Discussion in 'Photography Beginners' Forum' started by padrepaul77, Aug 21, 2009.

  1. padrepaul77

    padrepaul77 TPF Noob!

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    Was looking at a 75-300mm lens for the Olympus E620, and was wondering about tele-converters. I had one once and rarely used it; but are they worth it and what is the difference between them and say an extension tube?

    It's a nice zoom lens so it seems a TC purchase on top of it probably wouldn't be necessary.
    Thanks,
    Paul
     
  2. Josh66

    Josh66 Been spending a lot of time on here!

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    Very simple explanation -
    TC makes your lens longer, extension tube lets you focus closer.


    There is some loss of light that comes with the TC though...
    And you'll usualy loose infinity focusing with the extension tube.
     
  3. c.cloudwalker

    c.cloudwalker TPF Noob!

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    Also, while an extension tube has no glass, a teleconverter does. So the quality of a teleconverter is very important.

    But, just as it is with lenses, some third party teleconverter can be excellent and cheaper.
     
  4. ocular

    ocular TPF Noob!

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    If you have a cheap glass a tc gonna still create cheap looking images.
     
  5. musicaleCA

    musicaleCA TPF Noob!

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    TC's will increase purple fringing, in general, no matter how wonderful they are. It's just a necessary trade-off. A TC will always degrade IQ, no matter how good your glass is, though you will naturally get better results with top-end glass and a TC over cheap glass. Another consideration is that as the TC increases in magnification, so to does the loss of light and aberrations. Many will chose a 1.4x TC over a 2.0x TC for this reason.
     

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