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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 15 Sep 2013 (Sunday) 00:00
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Extension Tube EF 12 II

 
Paulo ­ Roberto
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Sep 15, 2013 00:00 |  #1

Hi everyone,

My question is: I've just bought a Canon Extension Tube EF 12 II. I have a 60D and a EFs 17-55mm . But, when mount the Extension to the lens, it does not focus at all! I cannot get any focus, no matter the distance. But, I get the extension tube working all right with a 75-300 lens. And yet, Canon says the this extension works ok with this lens.

Please, any idea about what's going on?

Many thank,

Paulo Roberto (Brazil)




  
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Paulo ­ Roberto
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Hatchling
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Sep 15, 2013 00:03 |  #2

Hi everyone,

My question is: I've just bought a Canon Extension Tube EF 12 II. I have a 60D and a EFs 17-55mm . But, when mount the Extension to the lens, it does not focus at all! I cannot get any focus, no matter the distance. But, I get the extension tube working all right with a 75-300 lens. And yet, Canon says the this extension works ok with this lens.

Please, any idea about what's going on?

Many thank,

Paulo Roberto (Brazil)




  
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Canon ­ Bob
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Sep 15, 2013 03:03 as a reply to  @ Paulo Roberto's post |  #3

The range of distances are quite small when using this combination Paulo. At 55mm then the maximum distance you'll be able to focus at is around 160mm from the front of the lens. As you zoom out (towards 17mm) the distance will become shorter until in becomes impossible as the object plane moves into the lens.

Bob


1Dx2 (2), 5DSR, 1Ds3, 1D4, 5D2(590nm), 5D2(720nm) EF600 EF400 EF300-II EF300 EF200 EF200-II EF180L EF135L EF100 EF85-II EF50L TS-E17/4 TS-E24L-II TS-E45 TS-E90 MP-E65 EF70-200-II EF24-70/2.8-II EF16-35/4 EF8-15/4 EF11-24/4 Zeiss 15/2.8 21/2.8 25/2 28/2 35/1.4 35/2 50/2 85/1.4 100/2 135/2 T/C's L-SC & a WIFE!

  
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Paulo ­ Roberto
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Sep 15, 2013 13:21 |  #4

many thanks




  
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Paulo ­ Roberto
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Sep 15, 2013 14:05 |  #5

Canon Bob wrote in post #16297431 (external link)
The range of distances are quite small when using this combination Paulo. At 55mm then the maximum distance you'll be able to focus at is around 160mm from the front of the lens. As you zoom out (towards 17mm) the distance will become shorter until in becomes impossible as the object plane moves into the lens.

Bob

I did think I was getting an extension tube, as the one I had on an older Canon. The one that duplicated the lens rage. Is it still possible?
Thanks again




  
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NotBlake
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Sep 15, 2013 16:20 |  #6

Paulo Roberto wrote in post #16298615 (external link)
I did think I was getting an extension tube, as the one I had on an older Canon. The one that duplicated the lens rage. Is it still possible?
Thanks again

I think what you want is a Teleconverter, which magnifies the image. Canon makes them in 1.4x or 2x magnifications.

Edited to note that Canon's teleconverters are not compatible with any of the lenses you mentioned.




  
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Canon ­ Bob
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Sep 15, 2013 16:22 as a reply to  @ Paulo Roberto's post |  #7

I think you're talking about an "Extender" and not an "Extension tube". An Extender (it has optical elements in it) will increase the focal length, typically 1.4x or 2x, whilst an Extension tube (no optical elements) adjusts the range of achievable focus.

In simple terms, an Extender appears to bring the subject closer whilst an extension tube allows you to get closer to the subject and still focus.

Bob


1Dx2 (2), 5DSR, 1Ds3, 1D4, 5D2(590nm), 5D2(720nm) EF600 EF400 EF300-II EF300 EF200 EF200-II EF180L EF135L EF100 EF85-II EF50L TS-E17/4 TS-E24L-II TS-E45 TS-E90 MP-E65 EF70-200-II EF24-70/2.8-II EF16-35/4 EF8-15/4 EF11-24/4 Zeiss 15/2.8 21/2.8 25/2 28/2 35/1.4 35/2 50/2 85/1.4 100/2 135/2 T/C's L-SC & a WIFE!

  
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Paulo ­ Roberto
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Sep 16, 2013 08:47 |  #8

NotBlake wrote in post #16298938 (external link)
I think what you want is a Teleconverter, which magnifies the image. Canon makes them in 1.4x or 2x magnifications.

Edited to note that Canon's teleconverters are not compatible with any of the lenses you mentioned.

you're right, i've made a mistake. But, according to you, they are not compatible with any of the lenses I mentioned, right? Many thanks

Paulo




  
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Paulo ­ Roberto
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Sep 16, 2013 09:06 |  #9

Canon Bob wrote in post #16298944 (external link)
I think you're talking about an "Extender" and not an "Extension tube". An Extender (it has optical elements in it) will increase the focal length, typically 1.4x or 2x, whilst an Extension tube (no optical elements) adjusts the range of achievable focus.

In simple terms, an Extender appears to bring the subject closer whilst an extension tube allows you to get closer to the subject and still focus.

Bob

Ok, I made a mistake, but I was told the extender does not suit the EFs 15-77 Canon lens. Is it so?

many thanks




  
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Madweasel
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Sep 16, 2013 11:18 |  #10

Paulo Roberto wrote in post #16300521 (external link)
Ok, I made a mistake, but I was told the extender does not suit the EFs 15-77 Canon lens. Is it so?

many thanks

The Canon extenders have optical elements that stick out forward of the mount where the lens goes, so will only work with lenses that have recessed rear elements - this is mainly L series telephotos and telephoto zooms. Teleconverters made by Sigma and Kenko etc. don't do this so they can be mated to any lens. They still work best with longer lenses though.


Mark.

  
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jimewall
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Sep 16, 2013 17:48 |  #11

Paulo Roberto wrote in post #16297216 (external link)
Hi everyone,

My question is: I've just bought a Canon Extension Tube EF 12 II. I have a 60D and a EFs 17-55mm . But, when mount the Extension to the lens, it does not focus at all! I cannot get any focus, no matter the distance. But, I get the extension tube working all right with a 75-300 lens. And yet, Canon says the this extension works ok with this lens.

Please, any idea about what's going on?

Many thank,

Paulo Roberto (Brazil)

Madweasel wrote in post #16300833 (external link)
The Canon extenders have optical elements that stick out forward of the mount where the lens goes, so will only work with lenses that have recessed rear elements - this is mainly L series telephotos and telephoto zooms. Teleconverters made by Sigma and Kenko etc. don't do this so they can be mated to any lens. They still work best with longer lenses though.

Except the OP has an EF-S lens. There is no teleconverter (for dSLRs of any brand) that fits EF-S lenses.

If the OP really bought the Canon Extension Tube EF 12 II, it would fit the EF-S. But if he is wrong and bought a TC, then it should not even mount on any EF-S lens.

He has stated he bought a "Canon Extension Tube EF 12 II" and implies that it mounted to the camera, by saying it just doesn't focus at any distance. If it mounts to the lens, then he has an ET and the mark II ETs should work with his lens. Either he is not getting close enough or something is wrong.

But if the OP is wrong and has a TC, then it just is not going to work on an EF-S lens, it would not even mount to the lens. Though if somehow he got it to mount on his lens and camera (like he mentioned), then it should work (and I want to know how he got them together).


Thanks for Reading & Good Luck - Jim
GEAR

  
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Extension Tube EF 12 II
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