Extension tubes on a 100-400?

swag72

swag72

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Sara
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I have been wondering what difference, if any, I would see by adding extension tubes to my 100-400? Say I was taking butterfly pics, Would that mean I could get closer to focus? Would it make the image bigger?

Would I be able to take pics of say birds at a distance? What difference would it make then?

Always striving to get closer!!
 
It would reduce your minimum focus distance allowing you to zoom more with your feet but you'd lose the ability to focus to infinity
 
Be very careful if you go ahead with that set-up!

I am not a Canon user, but I am guessing the 100-400 is not a light lens. As such, putting an ET between it and your camera body will be a bit of a fiddle; in that I mean that there may be a bit of flexing at the joints.

I've tried the Nikon 70-300VR lens, which is not a very heavy lens, with Kenko ET (which I believe are the same as the Canon one) and there was a bit of flexing. It scared me to keep that set-up as I am sure it would eventually snap off!
 
So what happens when you use extension tubes on a macro lens?
 
^^ Exactly the same thing....minimum focus distance is reduced and magnification is increased as a result.

Bob
 
Thanks for the swift answer Bob
 
As above - allows closer focussing, at expense of some light and unable to focus to infinity.
Took this in the garden with a Sigma 70-300 + Jessops' tubes (would not have got anywhere near as close without the tubes):

3388830010_4617622aea_o_d.jpg
 
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