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09-25-2012, 12:29 AM   #1
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Fact or Fiction _ Sigma 18-125mm f/3.5 DC OS HSM Pentax

Hello folks

i dont like changing lenses so often. And during my photo trips i am changing them often

pentax 18-55, and 50-200

So i am thinking i could buy Sigma 18-125. I found some markets and i am little bit confused. If someone could help and answer few questions, that would be so great!

appreciate so much

1)
Sigma 18-125mm f/3.5 DC OS HSM Pentax is fake? F/3.5 for 18-125? Its mistake? Should it be 3.8-5.6 or something? Because just 3.5 seems like fast lens

2)
Why i found Sigma 18-125mm with these different aperture values?
f/3.5
f/3.8-5.6
f/3.5-5.6

09-25-2012, 01:17 AM   #2
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There is two version of Sigma 18-135mm lens, an older discontinued version (18-125mm F3.5-5.6 DC) and a newer version (18-125mm F3.8-5.6 DC OS HSM), but the newer version do not include optical stabilization for Pentax.

Sigma has information on their lenses easily available at: Sigma Lenses Overview | SigmaPhoto.com
09-25-2012, 01:58 AM   #3
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thanks Fogel!

so older version does have OS?

Which multipurpose lenses from Sigma have OS for pentax mount? Is there any?

Last edited by romansolar; 09-25-2012 at 02:19 AM.
09-25-2012, 02:34 AM   #4
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QuoteOriginally posted by romansolar Quote
thanks Fogel!

so older version does have OS?

Which multipurpose lenses from Sigma have OS for pentax mount? Is there any?
The older version of 18-125 is without OS on all mounts.

Check specifycation on each lens on Sigma site, and you will find which one have OS for Pentax (or you can use the "lens finder" function on Sigma site).

09-25-2012, 02:35 AM   #5
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It appears that there is this lens - I would suspect that Sigma does not feel the need to include optical stabilization in the K mount lenses since Pentax has in-body shake reduction. If the lens has stabilization, you would only use either the in-body or the lens, but not both. If you were to use both, they would each cancel out the other. If you were to use both, the lens would sense the movement, and move the lens elements to cancel the movement thus stabilizing the light on the sensor. If the in-body shake reduction were also active, the in-body SR would sense the movement (the same movement sensed by the lens) and move the sensor in order to negate the movement - however since the light was essentially stabilized by the lens, the movement of the sensor essentially adds the movement back in thus counteracting the action of the lens. You would need to turn one of them off (OS switch on the lens or turn SR off in the body).

09-25-2012, 03:23 AM   #6
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ouch, really

someone told me that its great to have body with stabilization, because i can use lens without OS, but also i could benefit from having OS lens and also body stabilization

hmm, strange. So new lenses for pentax are always without OS?

thank you guys for response

ps: i also thought that OS lens is better then body stabilization
09-25-2012, 04:14 AM   #7
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Sigma seems to have changed their policy a few times over time.
- At first they made two different versions of the lens, one more expensive version with OS, and a cheaper version without OS. OS version of the lens was only available for CaNikon.
- Then they made one version of the lens including OS for all mounts.
- Now they make one version of the lens, but remove OS function for Pentax. And Pentax user have to pay the same price as on OS version, and the size of the lens is bigger than it has to be.

Last edited by Fogel70; 09-25-2012 at 04:21 AM.
09-25-2012, 05:18 AM   #8
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Thanks Fogel!

i would like to know your opinion, should i look for multipurpose zoom lenses from different company? because looks like there is no reason to buy OS lens

Roman.

09-25-2012, 05:52 AM   #9
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IMO the best budget choice is a used Pentax/Tamron 18-250. Small size, good IQ for this type of lens and cheap.
SMC Pentax-DA 18-250mm F3.5-6.3 ED AL [IF] Reviews - DA Zoom Lenses - Pentax Lens Reviews & Lens Database
09-25-2012, 09:33 AM   #10
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thank you for your suggestion
09-25-2012, 07:18 PM   #11
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Although more expensive, if you can wait you might want to consider the not-yet-released 18-250 sigma - or at least wait to read some comparative reviews of it.

Paul
09-26-2012, 12:02 AM   #12
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thanks Paul, will consider it. I would like to have new lens as soon as possible but i am not gonna buy it today.
09-26-2012, 01:01 AM   #13
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I wish Pentax or Sigma DID in fact make a 18-125mm f3.5 or even a f4. Or better a 2.8. Would be a great gig lens.

Something akin to the Canon 24-105 f4L or Nikon's 24-120mm f/4.

Or Pentax should just do an AF update of the A 35-105 f3.5. That would be cool.
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