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05-10-2010, 05:55 PM   #1
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Sigma HSM?

Is HSM anything like SDM? and is it worth the extra $$$ to get it?

Also... does it even work with Pentax?


Last edited by NecroticSoldier; 05-10-2010 at 05:57 PM. Reason: Extra
05-10-2010, 06:14 PM   #2
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Yes, depends and yes.

I think it's really only worth it if you need silent focusing. Weddings for example. I also find that the AF is a bit quicker and a bit more accurate.

I only have one HSM lens, the 50-150mm and I find that the extra $$$ is worth it.
05-10-2010, 06:18 PM   #3
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Picked up the Sigma 70-200 HSM II a few weeks ago - Fast Accurate focusing!

Well worth the $$

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05-10-2010, 07:15 PM   #4
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Yes, HSM operates on the same principal as SDM - it uses a 'ring-type ultrasonic' motor.

I have the new 17-70 F2.8-4 with HSM and like others have said it is nearly silent and fast... Personally I think where HSM really shines is continuous AF, its just able to change much faster, although that is partially dependent on the body.

05-10-2010, 07:22 PM   #5
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A $600 difference on the Bigma...:-(
05-11-2010, 10:25 AM   #6
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I only have to lenses to compare: Pentax' 16-50 and Sigma's 70-200 (HSM Macro bla bla II). But out of these two the Sigma totally destroys the Pentax - focusing is not only faster and more reliable, it also feels much better. Where the Pentax has ~45 of turning action, the Sigma has 140 - but only for MF - actual rotation is around 70, it has some kind of gears that doubles the range.
One several occasions the Pentax pissed me off royally because it so often doesn't find anything to lock on or if it does it's totally off my desired focus spot.
The Sigma didn't disappoint till now.
05-12-2010, 08:03 AM   #7
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QuoteOriginally posted by AdamJ Quote
Yes, HSM operates on the same principal as SDM - it uses a 'ring-type ultrasonic' motor.
I believe HSM uses an ultrasonic ring motor whereas SDM actually uses a ultrasonic micro motor.

I have one experience with HSM, my 70-200mm F2.8 HSM II, and I have not been disappointed yet, not with the speed, the quietness nor the accuracy.
05-12-2010, 08:17 AM   #8
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I have the Sigma 18-250 OS HSM. Fast, accurate, and quiet focus. Great IQ, too.

05-12-2010, 09:08 AM   #9
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QuoteOriginally posted by Parallax Quote
I have the Sigma 18-250 OS HSM. Fast, accurate, and quiet focus. Great IQ, too.
Yup. It's almost at the point where I might be ditching my Sigma 17-70 except for situations where I need the fast aperture...
05-12-2010, 10:30 AM   #10
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QuoteOriginally posted by pop4 Quote
I believe HSM uses an ultrasonic ring motor whereas SDM actually uses a ultrasonic micro motor.
The only 'non-ring type' ultrasonic motor drive I'm aware of is Canon's "Micro Ultrasonic Motor" which is essentially a normal winding motor just built smaller. While it is quieter then normal gear driven motor AF, it is still nowhere near the nearly silent ultrasonic ring-type motors.

From my limited experience with the 16-50 and 50-135, they sounded and behaved precisely like an ultrasonic ring-type of motor, including the ability for instant manual focus over-ride.

I admit that I may be wrong - but until I can see an exploded view or breakdown of an SDM lens, I will tend to believe otherwise...
05-12-2010, 10:37 AM   #11
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QuoteOriginally posted by AdamJ Quote
The only 'non-ring type' ultrasonic motor drive I'm aware of is Canon's "Micro Ultrasonic Motor" which is essentially a normal winding motor just built smaller. While it is quieter then normal gear driven motor AF, it is still nowhere near the nearly silent ultrasonic ring-type motors.

From my limited experience with the 16-50 and 50-135, they sounded and behaved precisely like an ultrasonic ring-type of motor, including the ability for instant manual focus over-ride.

I admit that I may be wrong - but until I can see an exploded view or breakdown of an SDM lens, I will tend to believe otherwise...
Well I was wrong, I did find comments online by someone who took apart and SDM lens and confirmed its based on a micro motor, which was surprising.
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