Pros: Great for long distances and approaching difficult subjects.
Cons: 5.6 aperture may be difficult at times, but still a great value.
I purchased the Tamron 70 300mm lens about two years ago, and it is still a big part of my photographic work. The lens works well for close up shots that are not easily approached. Ive used this lens to achieve superior shots of beautiful birds, animals and stunning air show jets. Along with my Minolta Maxxum 7, this lens focuses fast and accurately. Although the largest aperture is 4.0 at 70mm and 5.6 at 300, Ive had no trouble gaining proper exposure in all situations. I found this lens offers a greater value for the money, as it is considerably less than a lens with a wider aperture at 2.8 for example. Zoom lenses are commonly found with 4-5.6 and 3.5-5.6 apertures, so I have come to work with what I have to use, rather than finding a lens with one extra stop. My budget felt a lot better after the purchase of this lens, and I am definitely happy with my results. Its also great to have a lens with a macro setting, as this lens offers. The macro setting gives spectacular results with portrait close-ups. I also enjoy shooting rare butterflies and other insects in my spare time, and again, the macro setting really comes in handy when focusing that close-up. Im not saying I could live without my 28-105mm lens, but this lens is a must have for anyone who enjoys getting detailed results from beautiful subjects. (My 28-105 lens is also a Tamron)