Measures 3 inches in diameter and 4.6 inches long; weighs 15.3 ounces
Customer Reviews:
Great Lens for Price 
A significant improvement over the older Tamron units. Good to excellent when two or more f stops applied. Slight purple fringing on highly backlighted subjects but easily removed in post processing. Overall, highly reccommended.
lens for the money
I am really impressed with this lens for the money. I would like something faster and quicker focussing would also be an advantage as sometimes shots of wildlife are lost in the hunting for focus, it can be quicker to use manual.
The images are very sharp and the colours are very true with almost a Fuji film type effect - quite vivid and bright but remaining true to life. I really like this lens.
If you spend most of your time at the wide end and need a long telephoto less often but want sharp images when you do then this in one to consider. Its made me rethink Tamron as a serious contender again.
Monster Lens
Quality product, extremely versatile lens, moderately priced, a welcome addition for my Sony DSLR A-100.
Great dual function lens
I wanted a new macro and telephoto lens for my Sony Alpha 100 but couldn’t afford to buy both. But with this lens, a flip of the switch allows you to take some very nice close-up shots and the telephoto focus is very clear for a 300mm. I am very pleased with the performance and the price. I will try other Tamron lens now that I have seen what this one is capable of.
Awesome lens at a bargain price
When my old Sigma 70-300mm lens died this summer, I wondered if I’d be able to replace it with anything I liked as well. I’d used it with my Minolta SLR camera for years, and then for a couple of months with my new Sony DSLR, and it had performed beautifully. But this Tamron lens far exceeded my expectations. It is relatively lightweight, yet feels sturdy enough to stand up to hard use. The focus is sharp and quick, and it works very well with Sony’s Super Steady Shot feature (essential for me since I don’t use a tripod). Pictures shot in macro mode are gorgeous, once I got used to the minimum focal distance. And the price of the Tamron lens is a real bargain when compared to other lenses that work with Sony DSLRs. I’m a pretty good amateur photographer, and I’m picky about the quality of my equipment, but I don’t want to spend more than I need to. This lens is just what I needed.
