This has got to be the ultimate birding lens for use in the UK, where you can't generally get that close to your subjects or they are small. Images are fantastically sharp with superb detail on both FF and APS-C bodies. On an APS-C, it gives a immense...

I use this lens primarily for Wildlife, a step up from my trusty 400mm 2.8. It does make a difference and allows me to reach further into my subjects. Weight is always important but the difference is minimal for the focal length gain. Great lens...