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Sigma 18-250mm F3.5-6.3 DC HSM Optical Stabilised Lens for Pentax Digital SLR Cameras

by Sigma

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1 new from £295.00 1 used from £299.00
  • A compact, lightweight super-zoom designed exclusively for digital SLR cameras with APS-C size sensors
  • Includes Sigma’s OS (Optical Stabiliser) technology
  • HSM (Hyper Sonic Motor) ensures very fast and quiet auto focusing
  • An ideal alternative to a standard zoom
  • Four SLD (Special Low Dispersion) glass elements and three aspherical lenses produce superior image quality
  • Multi-layer coating optimises quality for digital photography
  • Compact and lightweight
  • Non rotating front element makes it suitable for use with polarising filters and the included petal type lens hood

There is a newer model of this item:


Product details

  • Product Dimensions: 7.9 x 7.9 x 10.2 cm ; 630 g
  • Boxed-product Weight: 1.4 Kg
  • Item model number: 18-250mm Pentax
  • ASIN: B001PGXEIS
  • Date first available at Amazon.co.uk: 21 Feb 2009
  • Average Customer Review: 4.8 out of 5 stars  See all reviews (4 customer reviews)

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Product Description

Product Description

Sigma 18-250mm f/3.5-6.3 DC OS (Stabilised) - Pentax Fit Lens

Box Contains

  • Lens Hood
  • Front and Rear Caps
  • Instruction Manual
  • 1 Year Warranty Card

  • Customer Questions & Answers

    Customer Reviews

    4.8 out of 5 stars
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    Most Helpful Customer Reviews

    2 of 2 people found the following review helpful By Son of Sam on 7 April 2013
    I've recently bought one of these second hand for my Pentax Kr, also bought a decent quality Hoya UV filter to act a lens protector. I already had the 18-55mm kit lens and also Sigma's excellent 70-300mm APO lens. I am very happy with the performance and quality of these lenses, however it is a real chore changing these when out and about. This is particularly true when out in the country and you are constantly switching between wide field landscape shots and trying to capture more zoomed in pictures of the wildlife.

    I've used this over the last couple of weeks and have found it to be an ideal 'do it all' walkabout lens. The image quality is very good, it is not quite as sharp as the 70-300mm but it is very close. This lens also has a number of other features which for me make it an absolute joy to use. The hyper sonic drive is ultra smooth and extremely quiet, I hate going back to the screw drive lenses now. This lens real strength though is the speed of focussing which is very, very fast and means that I should have fewer missed opportunities. I found that surprising at this price point.

    Another surprise was the focussing distance. The stated distance is 45cm but I found that the lens focussed at less than 30cm when I tried some macro shots on insects.

    The lens also has optical stabilisation which is marginally better than the camera's own system and remember to switch off the Pentax in-built OS if you are using this. Also remember to switch both off if you are using a tripod.

    I've no hesitation in recommending this as a great all in one lens.
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    7 of 8 people found the following review helpful By Bryan Johnson on 30 April 2012
    Verified Purchase
    A superb adjunct to this excellent camera. A fairly wide angle and superb telephoto lens - all in one, with very few snags. A bit limited maybe in very poor light conditions, but for wildlife photography certainly fast enough. Recommend switching off the camera's inbuilt stabiliser whist using, as the lens has its own system.
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    1 of 1 people found the following review helpful By I MACKENZIE on 2 Mar 2013
    Verified Purchase
    Brilliant lens for my K 30D. Stable lens with good autofocus but best effects when using either camera stabilisation or the in built system on the lens but not both together
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    Verified Purchase
    Bought immediately before going on hols so have lots of pics to carefully scrutinise. However, to date the quality of image seems first class, although the exposure seems a little inconsistent compared to my kit lenses. Can't understand that but I'm sure that there's a very simple solution. Regarding 'mechanics' of the lens some small niggles. Firstly, it doens't seem to lock on to camera body absolutely tightly, hence when removing lens hood there is some slight movement. Secondly, the zoom mechanism is not as smooth as I'd expected, at times it almost seems to lock in position and there is quite a 'jerk' when zooming out further. Thirdly, and I may have to get used to this, the autofocus is a little 'oscillatory' at times. insofar as it takes a while to 'log-on' to the point of focus. But, perhaps, that's an issue of the focus programme. Overall very satisfied with the lens and I'm sure with time that my concerns will resolve themselves (I hope)
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    Most Helpful Customer Reviews on Amazon.com (beta)

    Amazon.com: 223 reviews
    602 of 627 people found the following review helpful
    Sigma vs. Tamron 3 Feb 2010
    By J. Olliphant - Published on Amazon.com
    I would not give much credence to reviewers who compare lenses they have not actually used, or have only used one of them. We bought both This Sigma and the Tamron 18-270 and used them for a week in Mexico. We have a Nikon D70s and a D300, and exchanged the lenses after a few shots at the same time and place. We shot about 75% RAW and examined severe crops of the images on our 30" Apple Cinema Display before and after correction with Photoshop. Here is our opinion:

    The Tamron is noticeably sharper. The Sigma is very soft except at the low-medium zoom range, and it's still softer than the Tamron over its best range. The higher distortion of the Tamron is much less noticeable and easily corrected with software. The CA is about the same for both. Image stabilization was clearly more effective with the Tamron, especially at the long end where you really need it.

    The Tamron is noticeably slower in focusing than the Sigma, which is very fast for this class of lens. However, the Tamron often was more accurate and we missed several shots when the Sigma balked and did not focus at all. Over 5% of the shots we took with the Sigma were significantly out of focus, but only a few with the Tamron.

    With superzooms, you pick the weaknesses that bother you less. It was a close, but fairly easy decision. Though it was sometimes annoying to use, we got obviously better pictures with the Tamron. We both agreed to return the Sigma.
    166 of 176 people found the following review helpful
    All around winner for an all around lens. 28 May 2009
    By D. P. Murray - Published on Amazon.com
    Verified Purchase
    I just recently bought this lens primarily for its Optical Stabilization technology.
    My past lens the Sigma 28-300 was a great all around lens but it didn't have the image stabilization that this lens does. This lens with the range of 18-250 actually works better for an all around lens. I was a bit skeptical about the OS (IS Canon) technology but after using a Canon 70-200 2.8 IS. I couldn't go back to my sigma 28-300 without OS. I mean the difference was and is well worth the extra cost. I zoomed in all the way with the OS and without the OS on a rusted mailbox. The OS showed all the rust particles, the Non-OS showed blurred particles. That convinced me it was worth it. That extra crispness makes all the difference. Also, the price for this lens was outstanding when compared to the closest competition. I didn't really want the Tamron, and I wasn't about to pay 2,300 for the Canon 28-300 IS 3.5-5.6 that's nuts. Closer to 1,000 I might have. But this lens as far as I can tell is just as good as the Canon for a lot less expensive. I have NEVER and I repeat never had a problem with my previous Sigma lens. I had the 28-300 for about 3 or more years. And the image quality was always right up there with my Canon lens. I work with a 24-70 2.8L and a 70-200 2.8L IS, as well has 16-35 2.8L, my sigma photo quality kept up with if not is equal to them. Though the L series are built very heavy duty and are really great lens all around. The image quality is not all that superior if any. With the OS on this new lens the only advantage to a L series Canon would be the better build and better dust and weather resistance. But by all means the Sigma 18-250 is a all around winner for anyone wanted an all around lens.
    209 of 228 people found the following review helpful
    Excellent Lens... 11 May 2009
    By Gus - Published on Amazon.com
    Actually my review is somewhat similar to the previous review by W. Cooper. I, like him, didn't find much resources about this lens, but was confused between the Tamron & the Nikon long range lenses, I was about to go with the Nikon 18-200mm because I felt that the Tamron 18-270mm lens didn't really get good reviews and I didn't like the fact that it was slow in focusing. And boy am I glad that I waited for this one. I think I gambled (being an early adopter) and it worked.

    Its really a great all around lens which is exactly what I was looking for (I hate changing lenses). The best thing about it is that its really pretty fast in focusing at 250mm, maybe even faster than my D90 kit lens the Nikon 18-105mm. It really is a HSM equipped lens, I saw a few threads in forums about ppl debating this fact, so rest assured it has a motor. The OS is working as it should at maximum zoom as well so no issues here. I have been using it for a couple of days only to be fair, but I'm very excited about it and about the quality of the images I have took so far. I'm taking it out for a full test in the next few days, if I feel that things weren't perfect I will update this review. I didn't notice a lens creep (yet!), but in any case there is a lock switch on the lens, this switch will only work when the lens is at 18mm. I noticed that when you are trying to shoot close-ups at 250mm, the lens wont focus properly if you are too close to the subject, manual focus will still work though and you can take a clear sharp picture. The make and the body of the lens feels nice and durable as well, it doesn't feel cheap at all.

    In the end I have to say that this baby will beat the Tamron 18-270mm lens hands down, and surely the Nikon 18-200 if you want a bigger zoom. And the price is surely worth it and acceptable.

    Update: I think I was wrong about close-up focus, it still focus pretty well and fast at close range while at maximum zoom.

    Update 2: I have uploaded some pics in Picasa, plz see comments for link. The images don't look good after uploading to Amazon.

    Update 3: I have to confirm again my initial statement that sometimes it fails to auto focus at close range (according to my tests), I would have to use manual focus. Going back to auto focus it would then work, it seems it needs a reset from time to time!

    Update 4: It weighs around 650g or 1.43 pounds.
    45 of 47 people found the following review helpful
    Sigma 18-250 Canon Mount - good quality/price 28 May 2009
    By Andrew S. Koenig - Published on Amazon.com
    I was hesitant when it came to this lens. I have had Sigma lenses for >10 yrs and liked them, but found little to know information about this lens and was leaning toward the Tamron 18-275. The Sigma was about $30 less and I have never had trouble with my 3 other lenses. I even had Sigma replace one whose chip did not play well with my 20D, so I feel some loyalty to them. On preliminary use, it is about a pound and feels solid, and well made. Some complained about the mechanism being tight about half way from 18-250, I did not find it any more tight then my 28-70 or my 70-300 both by Sigma. The images are sharp generally except for the extremes on either end, so I will just avoid the very end of each side of the zoom range. I have not put the stabilization to the test yet, from what I can tell it does add about 2 stops and makes the hand held shots passable at longer focal lengths that would not have worked with out it. The other bonus is the rapid focus and quiet operation of the HSM.

    The one trade off and the reason for 4 vs. 5 is the weight. I have an 18-200 that does not have stabilization and the images at full or near full zoom are not so crisp (not the fault of the lens, but my not so steady hands). I always keep a monopod with me to minimize the shake, but this is not so convenient, so theOS is the reason behind the new Sigma. I understand the trade off for sharp pictures is some extra mechanics, but, it Sigma is reading this, shedding a little weight in the next version will go a long way. My only other comment is the f6.3 make it a bit dark at the high end of the zoom, again, trade offs are needed. If you use this outside you should be fine, but inside at a school play you may still need the monopod (got mine from REI - it is walking stick that has a removable head where you can attach your camera for about $60! REI Hiker Shock Light Staff) Over all I am very happy with another Sigma lens. and my next lens will be a 30 mm f1.4 prime sigma!

    Follow up 30 May 2009 - I had some more time to use the lens and found the OS works very well. I will post some images, but hand held at 1/15 gives a nice crisp image at f5.6. I don't have the most steady hands in the world and these shots at 250 mm would never have been worth anything before the advent of OS for hand held shots. Other shots in the 18-80 range are nice and sharp from about f5.3 and up. Very happy and with 17th St. Photo as well, very fast shipping and easy to deal with. Great lens for the money
    29 of 29 people found the following review helpful
    so far, so good! 4 Sep 2009
    By A. Rubin - Published on Amazon.com
    Just got the Sigma 18-250mm and am happy with it so far. Tried a variety of indoor/outdoor shots, and all are very sharp. See no difference in sharpness compared to my Nikon lenses. Focuses very fast, feels very solid. Was worried it would be heavy (it is heavier than the Tamron 18-270 and Nikon 18-200, according to specs), but it barely seems heavier than the 18-105 lens that came with my D90. Not much bigger, either. I tried it on my D60, and with that smaller camera, the lens made the whole camera feel unbalanced (lens-heavy). But with the D90, it feels balanced. Notice very slight zoom creep in the 80-135 range so far, but no big deal. Hope I will still be happy with it after my upcoming travels.

    Decided on this lens (vs. Tamron 18-270 or Nikon 18-200) because of price, and also because the Sigma has less distortion at 18mm than the others. So far it seems like a great deal, especially given its price relative to the Nikon.

    If you have a D40 or D60, besides the unbalance issue mentioned above, be aware that if you use this lens with the built-in flash with a focal length of 18 to about 22mm, the lens will cast a weird shadow in your images. The D90 -- to my surprise -- does this too, though it is not nearly as bad and could be cropped (at 22mm it is very slight). This same problem would happen with the Tamron and Nikon with the D40/60, but not sure about the D90. The Nikon is about .2 inches shorter than the Sigma, and I bet this makes a difference.) Anyway, chances are, you will not be using this lens at 18mm with the built-in flash very often. If you use an external flash, then there will be no shadow.

    Do research, and you'll find that the Nikon, Sigma, and Tamron all have their strong points. For me, the distortion of the Nikon and its much higher price, as well as some negative reviews about the focusing of the Tamron, made me choose the Sigma.
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