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Old Nov 17, 2006, 7:22 PM   #1
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Hey everyone. I've recently been looking at trying to find some extension tubes for use with my Canon 30D and 50mm f/1.8 EF lens. Someone mentioned a brand called Pro Optics. I've done some research but the sites I've visited do not say specifically that they can be used with EF lenses. Do the Kenko DG tubes work with Canon Ef lenses? Can someone provide some insight to using kenko or other extension tubes. Does the AF still work? Any and all advice is greatly appreciated. Thanks
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Old Nov 18, 2006, 6:11 PM   #2
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I have the Kenko tubes...used them with my 20D and 30D. They work fine with any lens I've tried. I have to admit though, I have not really used it that much. Tried them out with a Canon 50mm f1.4 and 85mm f1.8 lenses.
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Old Nov 18, 2006, 9:08 PM   #3
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AlpineMan wrote:
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I have the Kenko tubes...used them with my 20D and 30D. They work fine with any lens I've tried. I have to admit though, I have not really used it that much. Tried them out with a Canon 50mm f1.4 and 85mm f1.8 lenses.
Thanks for the info Alpineman. I have the 50mm f1.8 and 85mm f1.8. Just wanted to make sure they worked with the Ef lenses. Thanks again for the confirmation.
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Old Nov 18, 2006, 9:24 PM   #4
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Here is what little I know.
A friend of mine who is really good and has been shooting Canon film and then digital for a span of about 15 years tried the Kenko tubes and said they slowed down the AF of his EOS 1vHS.

Now, I have trouble figuring out *how* this happened.... really cheap quality electronics? I mean... really, there are no new optics involved here! I can't figure it out, but I trust him.

In my case, I own the Canon tubes and find they work perfectly with all the lenses I've used them on (600mm f4, 100-400, 28-135) on all the bodies I've tried (20D, 1D MkII N.)

I know someone who has used the Kenko tubes on Nikon bodies and they worked well.

Eric
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Old Nov 18, 2006, 11:23 PM   #5
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eric s wrote:
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Now, I have trouble figuring out *how* this happened.... really cheap quality electronics? I mean... really, there are no new optics involved here! I can't figure it out, but I trust him.
Very cheap indeed... :-)
It's a pass-through: just a conductive wire i.e. no active electronic involved and one can even Ohmed it out pins for pins (unlike a teleconverter)!

-> The slow down may be due to the AF not being able to work outside the lens limit such as @ infinity

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Old Nov 19, 2006, 3:45 PM   #6
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NHL are the Canon tubes made the same way as the kenko tubes (conductive wire)? Or is Canon really a better quality option?
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Old Nov 19, 2006, 9:43 PM   #7
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The Canon uses Super conductor instead to speed up the electrons!!! :blah:
-> I just don't know what they use for coolant though... may be the air inside the Canon tube is cooler than the Kenko :lol: :-) :G
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Old Nov 22, 2006, 4:45 PM   #8
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NHL wrote:
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The Canon uses Super conductor instead to speed up the electrons!!! :blah:
-> I just don't know what they use for coolant though... may be the air inside the Canon tube is cooler than the Kenko :lol: :-) :G
Anything with "super" in the description. . . . and I'm buying it :-)
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