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Old Jul 26, 2005, 1:18 PM   #1
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I have a 20D. I've been experimenting with the Tamron TC with my lenses. Interestingly, I don't lose any stops when I use it with a Tamron 28-75mm Xr Di f2.8 lens. I do lose 1 stop when paired with a Sigma 70-200mm EX HSM f2.8. I haven't had a chance to try it out with the rest of my lenses though:

Canon 50mm mkII f1.8

Canon 75-300mm IS USM f4-5.6

Canon 18-55mm kit lens



Shouldn't I be losing 1 stop for all lenses?
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Old Jul 26, 2005, 1:55 PM   #2
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AlpineMan wrote:
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I have a 20D. I've been experimenting with the Tamron TC with my lenses. Interestingly, I don't lose any stops when I use it with a Tamron 28-75mm Xr Di f2.8 lens. I do lose 1 stop when paired with a Sigma 70-200mm EX HSM f2.8. I haven't had a chance to try it out with the rest of my lenses though:

Canon 50mm mkII f1.8

Canon 75-300mm IS USM f4-5.6

Canon 18-55mm kit lens



Shouldn't I be losing 1 stop for all lenses?
That "SP" TC is a very good TC. I use the Kenko Pro 300 version, which is absolutely identical. You lose 1 stop for all lenses with this TC, regardless of which lens you put it on. Some lenses will communicate the light loss, others won't. But you are always shooting with 1 stop less with that TC. That said, you should stop down another 1 stop at least for better IQ. I wouldn't use the TC on any lens other than your 70-200. Enjoy.
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