Well people we're back, and firstly, no leopard. For those of you who don't live in Africa, unfortunately the wildlife doesn't just hang around waiting for photographers. I have only seen 3 and photographed one leopard in my whole life. But I keep going back to the same area hoping
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Now for the lens... Wow! Fast (focusing), sharp, and definitely weather resistant. We had intermittent rain the whole day, and the lens wasn't fazed by the light drops that I had to wipe off all the time. I was very impressed with the image quality, and the focus limiter was also a useful feature. As soon as I've downloaded all the images, I'll add some to this thread.
Thank you for all the interest and encouragement!