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03-22-2019, 07:49 PM   #1
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About to pull the trigger on Sigma 17-50, but found much cheaper OS version...

So according to my research, they used to make the lens for pentax with stabilization still built in, which is redundant. These lenses are $30 cheaper on amazon, but is there a down side that I am not seeing? Maybe a little extra weight?

03-22-2019, 08:19 PM   #2
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are these the lenses ?


Sigma 17-70mm F2.8-4 DC Macro HSM (Contemporary) Lens Reviews - Sigma Lenses - Pentax Lens Review Database

The Sigma 17-70mm F2.8-4 DC Macro HSM is the first of the new "Contemporary" Sigma zoom lenses. This new version of the 17-70mm includes improved optics and an all-new build which incorporates Thermally Stable Composites.

The Pentax version of this lens does not come with an in-lens stabilizer, as one is not needed due to the Pentax in-body Shake Reduction.


Read more at: https://www.pentaxforums.com/userreviews/sigma-17-70mm-f2-8-4-dc-macro-hsm-c...#ixzz5ixgRjEFR



____________________________________

Sigma 17-50mm F2.8 EX DC OS HSM Lens Reviews - Sigma Lenses - Pentax Lens Review Database


The Sigma 17-50mm F2.8 is a high-performance standard zoom lens. In our in-depth review (see seal below), we found it to outperform the Pentax DA* 16-50mm.


Read more at: https://www.pentaxforums.com/userreviews/sigma-17-50mm-f2-8-ex-dc-os-hsm.html#ixzz5ixgoNE2B

In the Pentax digital system we have a number of normal zooms to choose from, both manufactured by Pentax and by third-party manufacturers. In this review, we'll examine the most important aspects of three of the most popular fast normal zooms for the Pentax system, including the Pentax DA* 16-50mm f/2.8, the Sigma 17-50mm f/2.8 OS, and the Tamron 17-50mm f/2.8.

Read more at: DA* 16-50mm vs. Sigma and Tamron 17-50mm F2.8 Comparison Review - Introduction | PentaxForums.com Reviews
03-22-2019, 08:23 PM   #3
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QuoteOriginally posted by aslyfox Quote
are these the lenses ?
No, they are both 17-50. I will post the links:

amazon.com : Sigma 17-50mm f/2.8 Ex Dc Hsm Lens for Pentax DSLR Camera : Camera Lenses : Camera & Photo?tag=pentaxforums-20&

https://www.amazon.com/Sigma-17-50mm-Aperture-Standard-Digital/dp/B003A6NTIG...DT9KB968RAEJKY

The second one is an older model, and has a link to a newer model which is the other one without "OS" in the name.
03-22-2019, 08:28 PM   #4
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Personally I've been wanting to grab the OS version myself for video work. I don't think there's any difference optically.

03-22-2019, 08:29 PM   #5
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my bad, sorry

this is the newest one

Sigma 17-50mm F2.8 EX DC HSM

This compact and fast (F2.8) zoom is designed for APS-C size sensors. The lens is equipped with Sigma's Hyper-Sonic Motor (HSM) which provides for fast and quiet autofocusing. The lens has no provision for screw-drive autofocus. The lens focuses down to 11" (28cm).

This lens is identical to the earlier Sigma 17-50mm F2.8 EX DC OS HSM except for the removal of in-lens optical stabilization.


Read more at: Sigma 17-50mm F2.8 EX DC HSM Lens Reviews - Sigma Lenses - Pentax Lens Review Database


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03-22-2019, 08:40 PM   #6
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I would get the newest version of the lens. You don't have to use the OS.

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03-22-2019, 10:52 PM   #7
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I had the old version and it is a fine lens. My wife took it. You cant go wrong with that lens, new or old version.
03-23-2019, 06:13 AM   #8
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QuoteOriginally posted by catfishjohn Quote
I had the old version and it is a fine lens. My wife took it. You cant go wrong with that lens, new or old version.
Either version is good, but I think the newer one has better coatings for less flare ups...as an aside, when I see or hear "Catfish John" it reminds me of an old traditional of that name. Allison Krause and the Nitty Gritty Dirt Band do a fine version, but my favorite "Catfish John" rendering is by Jerry Garcia, the late, great front man of the Grateful Dead.

03-23-2019, 10:07 AM   #9
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It has been documented that you can't use both OS and SR at the same time, but maybe OS would be better for video with SR turned off, if you use video very often. I can't vouch for the older model as I have the latest one, which I like very much.
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