Reviews and Problems with Sigma 18-200mm f/3.5-6.3 II DC OS HSM
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Soft as a babies...
Rob, B&H Photo
19 June 2014
Excerpt: I've found that I have better results using time value (started using TV because of this lens) rather than aperture value (how i usually shoot). It's just too blurry otherwise. The first time I took it for a spin, I went to the park where they have lots of geese around all the time. This thing was putting the auto focus points on the grass, on the sidewalk, anywhere but on the geese...
Excerpt: In general terms it's a good "walking around" lens. The adjustment range is great. However the sharpness of the lens is simply far less than I expected. I well understand the fact the certain compromises in quality are to be expected when the zoom range is so great but many shots almost appear to be in "soft focus", particularly in low light situations. Focus seems a bit slow and is sometimes poor in very low light situations. Overall quality seems good.
Summary: I used this lens for the last year or so and have taken approx. 15k images with it. Mostly portraits, but some action shots. I've noticed at first when you turn the camera on it's side to get a vertical picture, the image would "shake" in the viewfinder. Give it a second or two and it will settle down. This started only on the vertical pictures, but it has now spread to the horizontal pictures too.
Summary: This is an older lens and doesn't always work well with my Nikon D5100. The autofocus often gets 'confused' and goes more out of focus than in, forcing the use of manual focus. Does not fire nearly as fast as my Nikon lenses when shooting sporting events. If I had it to do over again, I'd put the money towards a lens designed for a DSLR, the electronics in this lens don't seem to be able to keep up, whether it's due to age or design I don't know.
Summary: I am somewhat pleased... Lens kinda slips down when focusing in and out. Like its dropping. I ordered 2 filters which were suppose to fit it and one if them was too big. Thought I was getting a 62 but sent a 72. Other than that I feel the lens is pretty good. I wanted a lens that served the purpose of not having to change lens as much this solved the problem but feel a Canon would have been a better choice but money wise this was a good investment for right now
Excerpt: Optics are good. Focus speed is acceptable. Big problem is that the lens will slide out of the chosen focal length when you tip the lens down.This happened in less than 5 days shooting. Very irritating to pull the lens up to shoot and miss a wide angle shot because the lens had adjusted itself to telephoto! My Nikon 75-300 took several years(5 or more) to develop this problem. At $ still a useful purchase.
Pros: Consistent Output, Fast / accurate auto-focus, Lightweight
Summary: The picture it took is sharp and the focus is good. But it needs some efforts to zoom the lens. It feels like something stuck (I released the lock switch) inside. I can not do a continues zoom smoothly. Since it works well with this little defects, and my hands are strong, I will keep the lens instead of going through the replacement.
Excerpt: The HSM is quiet. The optics of this lens is OK. I compared the bokeh of this lens with my Pentax DA* 50-135mm at f=2.8, the Pentax one's bokeh is significantly smoother than this Sigma. The biggest problem I had with this lens is the slow focus at 50mm when aperture is opened to 2.8. I have to shot a indoor wedding, the focus speed of this lens for sure cannot help me catch the most important moments for my clients. I return it in exchange for a FA 77mm limited.
Pros: Easily Interchangeable, Strong Construction
Cons: Blurry Focus, Heavy, Poor in Low Light, Slow Focus