Summary: This is a very good lens for fullframe cameras, works well on subframes that have drive-motors as well...just one caveat with it, it's not light. Very sharp and reasonably fast and clear for a superzoom but it's a pocket full of change. you can check the specs on slrgear.com this lens is 550g vs 430g for the Tamron 18-250 which is the equivalent lens on a Sony with body-IS And that extra 120 grams is really noticeable on a light camera.
Summary: I started by looking at the Tamron 70-300mm and then thought about the many times I've lost shots while switching lenses. No need to switch with this lens and I ended up spending less than if I'd bought two. Eventually, I will buy a dedicated f/2.8 lens in the 15-50mm range; but for now, the flash takes care of those problems.
Pros: Consistent Output, Fast / accurate auto-focus
Summary: This is a very good lens to carry if you have a smiple project and you don't want to carry many lenses. It is exactly why I got this lens. Now there are some good things and some not very good things about this lens. Pro: 1. Versatile and lightweight 2. Wide range between wide angle and tele (mostly if you're doing full frame or film cameras) not so much in APC and small digital. 3. Good camera manufacturer 4.
Summary: I have used this lens for three weeks. It is a good alternative for carrying around multible lenses. I was looking for a good all around lens and this one is it. There are a few things that could be improved. The lens will hunt while in auto mode. The optics are not as good as compaired to my Canon 28-135, but overall it was worth the money.
Summary: Nice multipurpose lens. Easy to use, consisitent images, great range. It is on the heavy side, but that is to be expected. This has become my primary lens and coupled with a CP filter is perfect for outdoor shots of my kids exploring their world.
Summary: This lens is spectacular as an general walk-around lens. I take it out on hikes and to sporting events--the range of zoom is spectacular. The aperture is not great for low-light photography, but you're fine as long as you know that. Otherwise, the lens is a little noisy (sound-wise) but not too terrible at all. A great lens for a very reasonable price.