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Thread: Kenko extention tubes

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    Super Moderator NEF.D90's Avatar
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    Kenko extention tubes

    Heu everyone I bought a set of kenko extention tubes but not real sure if they will render the image I'm looking for.

    So by attaching an extention tube to the body can I get the 1:1 ratio that creates a macro shot.
    I'm not sure I'm explaining my self very well.

    What can you tell me about extention tubes?uploadfromtaptalk1442497792804.png
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    Administrator Aloicious's Avatar
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    Extension tubes allow you get get a closer minimum focus distance...you may or may not be able to get to full 1:1, depending on the lens you're using with them, but they'll for sure get you closer to it...you could even use them with a real macro lens and get MORE than 1:1 with them.they're basically just empty tubes that go between the lens and body.
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    Super Moderator NEF.D90's Avatar
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    So I should stack all three with the 600mm! Lol.
    Do I lose any light with these?

    Well I bought that set last night, $36 for a used set from adorama.
    $100 discount sure I'll take it. Heh
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    Administrator Aloicious's Avatar
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    actually it depends on the minimum focus distance of the lens that will make a bigger difference with these rather than the focal length. no light loss from them, they don't have any glass or anything in them. you won't be able to focus at infinity with them on though.
    -Justin

    Bodies - D800E
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    Super Moderator NEF.D90's Avatar
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    Quote Originally Posted by Aloicious View Post
    actually it depends on the minimum focus distance of the lens that will make a bigger difference with these rather than the focal length. no light loss from them, they don't have any glass or anything in them. you won't be able to focus at infinity with them on though.
    Yea I think they'll work well with the 85 1.8G and maybe the 35mm 1.4A. But the 600mm focuses at about 15ft.
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    Administrator Aloicious's Avatar
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    Sorry I should have said "magnification" not minimum focus distance. they should work ok on your lenses.

    fyi the magnification for your 85, 35, and 150-600 are respectively: 0.12x, 0.19x, and 0.2x (at 600)....(1:1 macro is 1x, so you can see none of these are really close to macro ranges as is)

    using the calculator here: http://www.cambridgeincolour.com/tut...es-closeup.htm

    with those number and 68mm of extension tubes (all of them combined I believe is 36mm+20mm+12mm right?) I get the following magnifications with your lenses:

    85mm- 0.92x with a new closest focus distance of 340.6mm
    35mm- 2.13X (greater than macro!) with a new close focus distance of 161.1mm (if you use just the 20mm and 12mm together, you can get 1.1x, which is pretty much pure macro, and still have 140mm close focus distance which might help)
    and 600mm - 0.31x with a new close focus distance of 3302.9mm

    you can see that the longer the focal length, the less effect they have, that 35mm looks promising, but with the lens being longer you might have to get the front element super close to whatever you're shooting which may be very hard, especially with bugs and live things, but give it a shot (remember that those close focus distances are the distance from your subject to the sensor, not to the lens). I'm looking forward to your results!
    -Justin

    Bodies - D800E
    Lenses - Sigma 18-35 f1.8 DC | Zeiss 15mm f2.8 ZF.2 | Zeiss 21mm f2.8 ZF.2 | Sigma 35mm f1.4 Art | 105mm f2.5 AI-S | 70-200 f2.8G VRII | 200mm F4.0D Micro AF | 300mm f2.8 VRII

    My PhotographyWild Blog

    C&C is always welcome on the images I post.

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