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09-18-2011, 06:57 PM   #1
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Sigma18-250

Just wondering if anyone here is using the Sigma 18-250 with a K5? Why does it have built in Image Stabilization? How does it do in low light? I've narrowed my search between the Sigma, and the Pentax 18-135mm.

09-18-2011, 07:03 PM   #2
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Sigma is starting to put OS in a lot of their lenses - it looks like people like it: Sigma 18-250mm F3.5-6.3 DC OS HSM Lens Reviews - Sigma Lenses - Pentax Lens Review Database

I wouldn't use this lens after sundown. Even the 18-135mm is a stretch for low-light photography. You'd need something faster for that, IMO (a prime perhaps).

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09-18-2011, 07:46 PM   #3
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The Sigma 18-250mm OS HSM is currently the only 18-250mm all-around lens available new for Petnax K-mount. Like all all-around zoom, the lens is a compromise and its weakness is the low-light.

In terms of IQ, there have been a few threads and the consensus is that the Sigma 18-250mm OS HSM IQ is on par with the IQ of the DA18-250mm/Tamron 18-250mm.

When comparing the Sigma 18-250mm OS HSM with the DA18-250mm/Tamron 18-250mm, the Sigma OS allows to see in viewfinder the image after stabilisation. On the other hand, the lens OS is redundant with the camera SR. In practice one, the camera SR or the lens OS, must be switched off. Myself, I do a lot of bushwalking and use my camera in rugged conditons. I regard HSM as a mechanical impedement and I value the simpler mechanics of the DA18-250mm.

Hope that the comments will help.
09-18-2011, 08:54 PM   #4
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QuoteOriginally posted by Adam Quote
Sigma is starting to put OS in a lot of their lenses - it looks like people like it: Sigma 18-250mm F3.5-6.3 DC OS HSM Lens Reviews - Sigma Lenses - Pentax Lens Review Database

I wouldn't use this lens after sundown. Even the 18-135mm is a stretch for low-light photography. You'd need something faster for that, IMO (a prime perhaps).
On a K5, do you really think it would be a problem?

09-18-2011, 08:57 PM   #5
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For low light, you need to use a fast lens: large aperture and low f. Like f1.4 or f1.8.

While the K-5 has great abilities at high ISO, the use of high ISO cannot replace the large aperture of these fast lenses.

Many 18-250mm lens users will travel with a small fast prime lens (in their pocket) for very low light conditions. I do.

Food for thoughts
09-18-2011, 09:06 PM   #6
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QuoteOriginally posted by hcc Quote
For low light, you need to use a fast lens: large aperture and low f. Like f1.4 or f1.8.

While the K-5 has great abilities at high ISO, the use of high ISO cannot replace the large aperture of these fast lenses.

Many 18-250mm lens users will travel with a small fast prime lens (in their pocket) for very low light conditions. I do.

Food for thoughts
Well I do have an old Super Takumar f1.4 50mm, but traving in Italy may present a problem changing lenses, especially with the fact that it's a screw mount, and will need the adapter.
09-18-2011, 11:09 PM   #7
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QuoteOriginally posted by Tony3d Quote
Well I do have an old Super Takumar f1.4 50mm, but traving in Italy may present a problem changing lenses, especially with the fact that it's a screw mount, and will need the adapter.
The trick there is to get a cheap clone adapter. Remove the screw and clip. Put a bit of metal tape on the lens base to safely short the mount contacts so you can use CIF (catch-in-focus). Use a rear lens cap as a wrench to tighten the adapter on the lens. Now you can treat the lens as a K-mount in Av mode. Easy to swap lenses when you go indoors or shoot at night.
09-19-2011, 10:00 AM   #8
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QuoteOriginally posted by Tony3d Quote
Just wondering if anyone here is using the Sigma 18-250 with a K5? Why does it have built in Image Stabilization? How does it do in low light? I've narrowed my search between the Sigma, and the Pentax 18-135mm.
I recommend a used DA/Tamron 18-250.

The reason is DxO: images treated with their lens module are two classes higher. Well, with enough light / low enough ISO at least. DxO has no lens module for the newer Sigma 18-250 and the IQ of the Pentax 18-135 seems to be weaker despite the more limited zoom factor.

09-19-2011, 06:10 PM   #9
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QuoteOriginally posted by Tony3d Quote
Well I do have an old Super Takumar f1.4 50mm, but traving in Italy may present a problem changing lenses, especially with the fact that it's a screw mount, and will need the adapter.
Youll be fine in low light with the K-5. I regularly shoot in low light with my Sigma 135-400 f4.5-5.6 using high ISO to get the shutter speed above the camera shake zone. Works really well even sometimes above ISO6400

of course a fast prime will always be be better at it's focal length of the fast prime. I have several fast primes and love the shallow DOF and low ISO usage these lenses get. but then the prime has one focal length and it won't be 250mm.
09-19-2011, 06:18 PM   #10
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QuoteOriginally posted by falconeye Quote
I recommend a used DA/Tamron 18-250.

DxO has no lens module for the newer Sigma 18-250 and the IQ of the Pentax 18-135 seems to be weaker despite the more limited zoom factor.
That Photozone test is bunk. I don't blame Klaus, he tried to have Pentax fix or replace the lens. I tested my 18-135 vs my DA L18-55 and DA 18-250. Wide open at 18, 55 and 135mm, it was sharper that the others across the frame. Mechanically it is in another league entirely.
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