| Latest Review Posted | Sigma DC OS HSM 18-250mm F3.5-6.3
I bought this lens for a family trip to Paris as I was fed up having to change lenses. I wasn't expecting fantastic results but have been pleasantly surprised and very happy with the convenience of using just one lens. I was particularly pleased with the auto focus capability, which is fast, almost silent and accurate. Another surprise was the in lens OS, which us Pentax users are not particularly used too. You have to remember to switch off the in camera OS, which I forgot do on one occasion and ended up with a batch of unusable images. There is a zoom lock, which is a very useful addition as the lens extends quite a long way when fully open. The main downside is the slow aperture when zoomed out, however I did not find this to be a problem for daytime shots, especially with the K5's ISO capabilities. To combat this downside I simply packed a small fast prime lens for low light situations. These two lenses provided a very versatile travel kit.
When purchasing I was able to compare the Sigma to the Pentax and Tamron lenses of similar focal ranges. In terms of build quality and specification there was no question the Sigma was far superior, but larger and slightly heavier.
A few sample images from our trip. I have edited these in Aperture, however they indicate the lens capabilities.
https://www.pentaxforums.com/forums/members/57893-richii67/albums/7158-paris-2013/picture63124.jpg
https://www.pentaxforums.com/forums/members/57893-richii67/albums/7158-paris-2013/picture63123.jpg
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