Summary: I've owned the Tamron 200-500mm telephoto lens since 2010 and have used it several times at a zoo or landscape shots. Last night I used it for my grandson's baseball game on my Nikon D800 and was very impressed with how fast it focused which I thought was as fast, if not faster, than the Nikon 80-200mm which I usually use for his games.
Summary: At first i was disappointed that focus was more soft than expected at the extremes of zoom (200to 230. And 475-500) HOWEVER.. Between 240mm and 470mm of zoom it is one the finest pieces of glass in my lens stable! And it performs extremely well throughout that range in conjunction with a Tamron 1.4 teleconverter as well! Also, its performance with a 2x converter is very good between 2250mm and 425mm. It is absolutely an indispensible part of my regularly used kit!
Summary: I knew this when I bought it. I use it for getting the shot of dogs running Lure Coursing which is an outside event. I have several Tamron lens. I love the old ones best they seem more compatable with Canon bodies I have. Also they seem clearer and better lens in general. Not as happy with the newer ones.
Summary: Good response when focusing, needs plenty of light, you will need a tripod to use in wildlife. I am not super happy with it but I can't afford the Nikon product. The Tamron does the job, I am not happy since I do wildlife photography and not good when birds are in motion.
Summary: This lens is worth what they ask for it. That is, it does not compare with the sharpness one would expect from a brand Nikon lens but the picture quality is fair. Don't expect too much bokeh or low-light capabilities. For shooting outdoors at reasonable speeds, this is a great lens.
Summary: I'm sure one of the Canon big lenses would be sharper and faster, but this one isn't a bad lens at all. I will try, but not recommend it, with a 1.4x extender. So far, the 500mm photos do seem a little soft. But if you have your f/7 to 8 in daylight you should be good. No IS? Hey, you'd pay a lot more for that. You are going to use this on a tripod or monopod, so no IS isn't a problem at all.
Light weight, good price, sharp at F/7.1, slow autofocus, slow max aperture
Grant Brummett, Amazon
6 August 2010
Summary: See Nov 2008 Updates below for comparison between this lens and my new Canon EF 100-400mm f4.5-5.6 L IS Pros: Relatively light Great bang for the buck Pretty sharp at F/7.1 @ 500mm Small size when zoomed to 200mm Nice tripod mount that allows you to rotate the camera and lens Cons: Slow autofocus No Image Stabilization Cheap plastic build and feel Slow max aperture especially at 500mm Works best at long zoom settings on a tripod Not as sharp as my Canon EF 100-400mm...