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Old Oct 5, 2006, 8:45 PM   #1
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I purchased the 70 - 300 DO lens and am very satisfied with it on my Rebel XT. Of course I occasionally want a little extra reach so I purchased a Canon 1.4x extender. The extender does not fit between the lens and the camera. I am thinking I could buy a 12mm extension tube and put it in between. Has anyone any experience with this configuration? What would be the consequences of having an extension tube?
Thanks in advance, Dave - in Elk Grove, CA

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Old Oct 5, 2006, 9:43 PM   #2
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Well the 1st thing is this combo will have an effective f/8 so it won't focus too well with the Xt
... and the 2nd thing is you might lose the ability to get to infinity (i.e. far end) even on manual focus
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Old Oct 5, 2006, 10:16 PM   #3
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Shoulda gotten a Tamron 1.4X SP AF (the white one) TC instead of the Canon...that TC works with just about any lens. You may lose autofocus on certain lenses, but you can "tape up" 3 pins on the TC to make AF work again. I've read that a "taped" Tamron focuses faster than a "taped" Canon TC.

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Old Oct 6, 2006, 2:16 AM   #4
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The 70-300 DO is certainly not designed to work with a TC, I'm pretty sure it says so in the manual. :-)

But good luck anyway and post some samples if you ever do get it to work.

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