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Thread started 23 Feb 2014 (Sunday) 14:04
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Extension tubes pricing

 
cleewag
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Feb 23, 2014 14:04 |  #1

I am ready to take the plunge into macro using extension tubes.
I use a 60D with a variety of lenses.
I am finding that there are basically two choices when it comes to rings with fully auto functionality. Those two being Canon and Kenko, which are quite pricey.
I have stumbled across a third-party 3 ring set on fleaBay for a third of what the exact same thing in Kenko costs, and would like some(any) input about their quality.

If I may, here is the link for them:
http://www.ebay.com …Tubes&hash=item​3a8173cef1 (external link)

As can be seen in the listing photos, they have metal mount plates and decent looking electrical connections just like the Kenko ones. Why would anybody pay $190 for Kenko, when those are available for $61??

Any and all thoughts will be greatly appreciated...




  
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CAPhotog
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Feb 23, 2014 18:33 |  #2

There is also one branded as Vivitar for about the same price point. It looks like this:
https://photography-on-the.net …/showthread.php​?t=1348124

They work and can offer enjoyable results as an introduction to macro photography without the expense of a dedicated macro lens. The difference between the more expensive extension tubes is primarily overall image quality and build quality. These tubes with their own lens elements reduce the amount of light passing through, causing softer focus and some vignetting. Less light also means auto-focus is more difficult in low light situations. Auto-focus for macro work is often not effective anyway, but on the sharper Canon or Kenko lenses will offer more utility. Still, flowers and bugs look pretty cool if that's what you are after.




  
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Jon
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Feb 23, 2014 18:59 |  #3

CAPhotog wrote in post #16711854 (external link)
There is also one branded as Vivitar for about the same price point. It looks like this:
https://photography-on-the.net …/showthread.php​?t=1348124

They work and can offer enjoyable results as an introduction to macro photography without the expense of a dedicated macro lens. The difference between the more expensive extension tubes is primarily overall image quality and build quality. These tubes with their own lens elements reduce the amount of light passing through, causing softer focus and some vignetting. Less light also means auto-focus is more difficult in low light situations. Auto-focus for macro work is often not effective anyway, but on the sharper Canon or Kenko lenses will offer more utility. Still, flowers and bugs look pretty cool if that's what you are after.

Extension tubes don't have any optics. They just move your existing lens further away from the camera (same as turning the focusing ring does, only more extreme. So the only difference will be build quality. Just remember, you may be hanging a fairly expensive (and heavy) object at either end of the tube; you really don't want to find out the hard way that the tubes you bought aren't up to the load.

You will lose light with any extension tube, but that's because increasing the distance between the lens and the sensor plane changes the actual f/stop (your marked f/ stop is only the "correct" reading when your lens is at infinity, but for "normal" use the change in f/stop is negligible). The actual f/stop you'll see with tubes or macro lens is (fl+ext)/(aperture opening). So a 50 mm f/1.8 lens with 32 mm of extension tubes on it will give you a working aperture of f/3.


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CAPhotog
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Feb 23, 2014 20:43 |  #4

Jon wrote in post #16711943 (external link)
Extension tubes don't have any optics.

Yep, you are right. I was incorrectly referring to an extender or teleconverter rather than extension tubes... the one in the link was even mine. :oops:




  
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LV ­ Moose
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Feb 23, 2014 21:06 |  #5

CAPhotog wrote in post #16712197 (external link)
Yep, you are right. I was incorrectly referring to an extender rather than extension tubes... the one in the pic was even mine.

You mean teleconverter? Your picture is of a set of extension tubes.


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CAPhotog
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Feb 23, 2014 21:12 |  #6

Right pic, wrong answer.




  
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jbrackjr
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Feb 24, 2014 07:51 |  #7

FWIW, I also bought a set from ebay. They appear to be the same set as the OP linked. But are even less expensive. See this: http://www.ebay.com …Tubes&hash=item​4acb4df6f1 (external link)
They take about two weeks to come in from China, had no problems with the seller.

They fit great on my 60D, each rings fit is perfect (not to loose, not to snug). The bodies are plastic as already indicated but appear to be very sturdy. I have no concerns about them breaking under the weight of my lenses. Full disclosure, I am not planning on using my 150-600 Tamron with them!


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Feb 24, 2014 11:09 |  #8

I have long discovered that my own interest in macro work is non-existent. So I use extension tubes merely to permit a bit closer focus distance than a lens' internal focus mechanism permits, but not macro work. As such, I decided to try a very inexpensive($50 set 13mm/21mm/31mm) no-name extension tube set which has the electrical pass-thru but COMPOSITE mount (not metal mounts). I have found theses to be more than satisfactory, and even if I stack all three they maintain continuity between lens and body!


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Feb 24, 2014 16:14 |  #9

Is that a tripod mount on the extension tubes?

IMAGE: http://i.ebayimg.com/00/s/NjAwWDYwMA==/z/D5MAAOxy0QtR8jeo/$(KGrHqJ,!lgFHPLvUVbwBR8jeohgCg~~60_3.JPG

IMAGE: http://i.ebayimg.com/00/s/NTAwWDUwMA==/z/dxwAAMXQS6pRvthx/$(KGrHqV,!nUFGmnr-JYDBRvth)CCwg~~60_3.JPG

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LV ­ Moose
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Feb 24, 2014 16:17 |  #10

msowsun wrote in post #16714269 (external link)
Is that a tripod mount on the extension tubes?

Well, that's kinda different.

And no markings.


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jbrackjr
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Feb 24, 2014 20:18 |  #11

Yes, the set I linked to has the tripod mount on the two largest tubes. I have not used that function but it appears to be sturdy.

There is no brand name, even on the box they come in. The tubes (13mm, 20mm & 36mm) are marked EF/EFS Electronic Macro Extension Tube and electric continuity is good using one, two or all three tubes between lens and camera.


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peeaanuut
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Feb 24, 2014 20:24 |  #12

they also sell the quick release tripid mounts if needed - same company
http://www.ebay.com …&ttype=price&ta​lgo=origal (external link)


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CanonCameraFan
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Feb 24, 2014 21:29 |  #13

If using heavy lenses, use the Lens Tripod Collar if available.

I bought my daughter a set of Xit XTECT Brand for EF/EF-S for about $50 and am well pleased with the quality of the metal mounts, releases and fit and finish. Vivitar appears to be the same unit as the style f the release tabs is the same.


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Feb 24, 2014 21:50 |  #14
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cleewag wrote in post #16711215 (external link)
[...] Why would anybody pay $190 for Kenko, when those are available for $61??

Any and all thoughts will be greatly appreciated...

Because there are certain rings that spontaneously detach and either the camera or the lens ends up on the ground, with varying degrees of damage.


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jbrackjr
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Feb 24, 2014 22:57 |  #15

^^ Which ones?


Jim
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Extension tubes pricing
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