by BAW0343 » Sat Jun 20, 2009 1:26 am
Don't let that 15x zoom fool you, that's only means 270mm is 15x more then 18mm. If your comparing it to a 15x zoom point and shoot then your not going to get what you think you are.
Don't get me wrong, 18-270 is a pretty sweet range, but its not as much as you think it is, as they list that 15x zoom to attract buyers. For example, I have a 75-300mm zoom lens. The formula for a lens' zoom is: longest MM setting / shortest MM setting=Zoom. So, 300/75=4 So essentially I have a 4x zoom lens, however my lens is 30mm longer then that one which means it has more "zoom."
Now don't get me wrong, the Tamron AF 18-270mm f/3.5-6.3 Di II is probably a fantastic lens. Its just some companies like to tack on these labels that will help sell the lens.
One more note. Make sure you read some professional reviews on the lens' performance. These superzooms often suffer from a decrease in image quality as they require more glass (internal lenses) to accomplish their focal length. More zoom = more glass, more glass = less image quality.
Just my $.02
Last edited by
BAW0343 on Sat Jun 20, 2009 1:29 am, edited 1 time in total.