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  1. #1

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    3X teleconverter

    A number of years ago a friend of mine died of a heartattack, my father bought some of his camera and accessories from his son.
    One of the acessories was a 3X(!) teleconverter. A vivater, from what I heard 2X are not the greatest optics so I wonder if I use once or twice to see how it works. What sould I except?

    Jeff

  2. #2

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    I should add I going use on it on Canon F-1 with a 400mm FD lens.

    Jeff

  3. #3
    Christopher Walrath's Avatar
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    Other than the obvious 4-stop loss of light and the need for a tripod, nothing really comes to mind. But being able to pick a pimple off a fleas but at three miles is always that should be in one's gadget bag. Just sayin'.
    Thank you.
    -CW

    "Wubba, wubba, wubba. Bing, bang, bong. Yuck, yuck, yuck and a fiddle-dee-dee." - The Yeti

  4. #4
    Dr Croubie's Avatar
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    Expect it to be 3x longer, 3x darker, and 3x more aberrations like purple colour-fringing etc. And because of the smaller aperture even 'wide open' it'll be in the realms of where diffraction is already kicking in.
    I've used some good TCs on digital (where problems show up the worst) with no problems.
    I haven't used a 3x, but I've stacked two 2x converters (kiev brand) which will probably be worse than a single 3x.
    I've had marginally useful shots on digital with two 2x (see here and here are mine, effective 1000mm f/14).

    Colour film is a little more forgiving because it's less resolution than digital, and on B+W film I've used stacked TCs occasionally with no major problems, plus you don't have to worry about the colour-fringing at all.
    An awful lot of electrons were terribly inconvenienced in the making of this post.

    f/64 and be there.

  5. #5
    Christopher Walrath's Avatar
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    Actually I have never seen a 3x teleconverter. And I find that designation strange as the lesser ones are usually 1.4X and 2X which is geometric in series as are f/stops. Just find it curious, that's all.

    Just asking. Sure it's not an extension ring?
    Thank you.
    -CW

    "Wubba, wubba, wubba. Bing, bang, bong. Yuck, yuck, yuck and a fiddle-dee-dee." - The Yeti

  6. #6

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    No it is not a extension ring. I never heard of one until now.

    Jeff

  7. #7
    Dr Croubie's Avatar
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    I've heard of them, seen either on fleabay, garage sale, or an 'antique' shop that sells junk for a few times more than it's worth. But never used or played around with them...
    An awful lot of electrons were terribly inconvenienced in the making of this post.

    f/64 and be there.

  8. #8
    MattKing's Avatar
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    Even if a 3X teleconverter is of the highest optical quality, it is still magnifying just 1/3 of the frame transmitted by the lens it is attached to.

    It will give you 3x the magnification though, with no change in subject distance at all.
    Matt

    “Photography is a complex and fluid medium, and its many factors are not applied in simple sequence. Rather, the process may be likened to the art of the juggler in keeping many balls in the air at one time!”

    Ansel Adams, from the introduction to The Negative - The New Ansel Adams Photography Series / Book 2

  9. #9
    Christopher Walrath's Avatar
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    Quote Originally Posted by Sirius Glass View Post
    Correct an extension ring is for close ups or macro photography and has nothing to do with 2x or 3x teleconverters.
    Oh thank you O Swamee of Duh.

  10. #10

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    Even the very best quality teleconverters still degrade the image. The greater the magnification the worse the degradation. This probably explains why they fell out of favor. They do make serviceable paperweights.
    A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.

    ~Antoine de Saint-Exupery

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