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Thread started 18 May 2005 (Wednesday) 11:35
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AI Servo 'tricks' and Sigma 70-300 APO

 
sf_1857
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Location: Round Rock, Texas
     
May 18, 2005 11:35 |  #1

Will the AI Servo "tricks" for the 300D work with the Sigma 70-300mm APO lens?

I am thinking about buying the lens but from reading the posts I see that USM is required on the Sigma for the AI Servo tricks to work.

Is the Sigma 70-300 APO a USM lens? I don't think it is.


Canon 20D
Canon 18-55mm
Canon EF 100-300 USM
http://www.samuelfowle​r.com (external link)

  
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Jon
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May 18, 2005 11:38 |  #2

If I read them correctly, what's required for one of the tricks was full-time manual, not just USM (micro USM doesn't generally support full-time manual). And the other two didn't require playing directly with the focus, but either zooming or moving the camera to fake it out. So, if you can get methods 2 & 3 to work, the lens shouldn't matter.


Jon
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spin180
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May 18, 2005 18:12 as a reply to  @ Jon's post |  #3

I just took possession of my new Sigma 70-300 APO today. Sigma's version of USM is called HSM, but this lens doesn't have it.

However, the AI Servo tricks do work with this lens; by moving the focus point and by changing the focal length, with the shutter half pressed.

;)




  
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AI Servo 'tricks' and Sigma 70-300 APO
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