Summary: I purchased this lens for greater Distance but when i spent the whole day on an excursion i had problems with this lens. It locked up on me at 200mm. I was able to get it lose but it did it again to me. also it doesn't do well with low light. This is a lens that needs a tripod to use ( which i figured that much anyways. It also has a built in colar for tripod which is a Pain getting around to adjust Distance. Also the lens hood is gigantic.