The lens of this is adjustable by simply moving the body of the lens round manually to increase or decrease the zoom depending on the distance of the subject. The lens will slowly increase in length showing the plain plastic inside of the lens as it is extended to its fullest length. The focus can be manually adjusted by simply moving the dial at the base of the lens, or you can, as I prefer to do make the lens automatically adjust by simply selecting the appropriate option on the camera body itself.
It is amazing to me the quality of the image when looking at objects there are a good 10m away. To test this theory, I first used the lens on the bird feeders in our garden and got some very good images of the Gold Finches feeding from a good 6m away.
As with any piece of camera equipment the most important aspect is the quality of the pictures that it produces. This lens has undoubtedly provided me with my best images to date, with 99 % of them being of a high resolution and completely in focus. It also has the ability to capture subjects close up and retain the background as a hazy blur, thus adding to the depth of the photograph.
Overall this camera lens has given me and my family a great deal of timeless and beautiful images. I would therefore highly recommend it as a useful investment piece of equipment in any photographers collection, be it for professional of hobby means.
As a result I am scoring this lens 5 starts out 5 for quality.