Sigma lens help?

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Posted 11/21/2012 by 4carley in General Photography
 

4carley
PeaNut

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Posted: 11/21/2012 6:15:21 PM
My husband has a lens on his Christmas list and I was hoping someone could tell me the difference between the

"Sigma 150-500mm f/5-6.3 AF APO DG OS HSM Telephoto Zoom Lens for Canon Digital SLR Cameras"

and the

"Sigma 150-500mm f/5-6.3 APO DG OS HSM Telephoto Zoom Lens for Canon Digital SLR Cameras"?

Is the difference auto focus? The one he wants does not have the "AF". Any help would be greatly appreciated as I have NO idea what I'm buying. LOL!

bendedroad
Nicki

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Posted: 11/22/2012 9:09:38 AM
I have no clue with regard to Canon lenses - but it would appear that the first listed has AF - auto focus - which on a lens that size would be a must.


Nicki

Nikon stuff!

The more I know, the more I realize how much I don't know!

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gardencat
Jeepers PEApers

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Posted: 11/22/2012 9:47:06 PM
I don't think Sigma actually produces two lenses with identical focal lengths and apertures but one with AF and one without.
It may be that the one without AF is an older version of the same lens...if so it might be hard to buy new, might only be available used or, sometimes when stores or sites list lenses like that with a long string of attributes (APO, DG, OS etc. etc. ) they will just drop one of attributes off. In which case I suspect that those are both the same lens but one of the listings was lazy and left the AF off.
I could be wrong, I'm pretty new to this but, as bendedroad pointed out a lens like that would be hard to use without AF . Also now that I look again, I think HSM refers to the type of motor that is used to auto focus so, if the lens has HSM then it must have autofocus (ie. AF).

4carley
PeaNut

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Posted: 11/23/2012 6:58:28 AM
Thank you so much ladies! I found one with the AF on one website for about $400 less than another website that did not list AF in the description, and wanted to make sure they were the same lens. It is a new lens as well. Thanks again!

leonamccauley
PeaNut

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Posted: 11/23/2012 7:23:00 AM
Even I guessed they won’t come up with two lenses of same focal length and one with AF and other without it.
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