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Old Jan 31, 2008, 12:12 PM   #1
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Will this lens work on the KM 7D utilizing the HSM auto-focus?
Sigma APO 70-200mm F2.8 II EX DG MACRO for Pentax and Sony
Sigma says in their announcement:
"*If the camera body does not support HSM motor, AF does not work."

My first post here -- thanks in advance

Bert
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Old Jan 31, 2008, 12:49 PM   #2
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You're in luck your 7D body does support SSM (HSM).

If memory serves me correctly it was first supported on the Maxxum 7 which I'm assuming was released after the Maxxum 9 because there was an upgrade for the Maxxum 9 if the user purchased the Minolta 70-200 SSM lense.
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Old Jan 31, 2008, 1:10 PM   #3
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Thanks kberntsen:

Now the financial justification. $800-900 for a telephoto lens ???

Bert

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Old Jan 31, 2008, 1:18 PM   #4
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I'd sit tight and see what the reviews for the Tamron 70-200/2.8 say. Adorama is taking orders for it for $699, about $200 less than the Sigma. It's not HSM, so if you need 'quiet', then the Sigma and Sony are all there is.
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Old Feb 1, 2008, 11:55 AM   #5
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TCav

I have never owned an HSM lens. Speed of focus is my main interest. Noise not important. Is there any significant diffference in focusing speed between gear driven and HSM?
Also, the A700 may be in my future and SONY says the A700 has a higher torque focus motor. Maybe I do not need the HSM.

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Old Feb 1, 2008, 1:45 PM   #6
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hingarfi wrote:
Quote:
I have never owned an HSM lens. Speed of focus is my main interest. Noise not important. Is there any significant difference in focusing speed between gear driven and HSM?
Also, the A700 may be in my future and SONY says the A700 has a higher torque focus motor. Maybe I do not need the HSM.
The advantage of having a motor in the lens is that a it may be better able to shift the elements of the lens that adjust focus. The fact that these motors make noises that are too high in frequency for humans to hear, is just an ancillary benefit.

So the HSM/SSM motors in larger lenses will, in most cases,autofocus faster than the motors in camera bodies. But if the motor in a camera body is faster and/or stronger, then the only real benefit would be the quietness of the HSM/SSM motor.

One might have an advantage over the other, but I don't have the equipment necessary to determine which it might be.
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Old Feb 1, 2008, 4:31 PM   #7
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Thanks TCav:

I think I'll just sit tight and wait for some reviews of the Sigma and Tamron 70-200 f2.8 lens's. I have the Tamron 17-50 f2.8 as my standard lens and I am reasonably satisfied with the focus speed on my 7D. Hopefully it will be even faster if I get the A700.

Thanks kberntsen and TCav. I appreciate the information

Bert
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