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02-20-2010, 07:38 AM   #1
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Questions about dual clutch focusing system (Tamron 70-200):

I've got some questions regarding Tamron's focus clutch system - but this may also apply to Sigma's 20-28mm f/1.8 Macro primes.

If both camera and lens are set to AF I have no manual control over focusing - right?
When I set the camera to MF but leave the lens on AF the lens can't be focused at all.
And if I set the lens to MF and the camera to AF the focus ring will just rotate like any other screw driven lens.

Is this correct?

02-20-2010, 09:17 AM   #2
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QuoteOriginally posted by Egg Salad Quote
I've got some questions regarding Tamron's focus clutch system - but this may also apply to Sigma's 20-28mm f/1.8 Macro primes.

If both camera and lens are set to AF I have no manual control over focusing - right?
When I set the camera to MF but leave the lens on AF the lens can't be focused at all.
And if I set the lens to MF and the camera to AF the focus ring will just rotate like any other screw driven lens.

Is this correct?
1. Yes, see next point
2. Yes, you would roll focus ring, but distance scale wont rotate (if lens set to AF).
3. Yes, your could burn your AF motor. Also focus ring will rotate when camera does AF.
02-20-2010, 09:33 AM   #3
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http://www.tamron.com/assets/pdfs/A001_70200.pdf
02-20-2010, 10:38 AM   #4
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Original Poster
Ok, thanks. Just wanted to have it confirmed.

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