When I'm not lugging my Gyno lens around in the summer I usually pack this. F4 isn't fast but so what. It doesn't need a hood and is very sharp and easy to use. Macro's make excellent all round lenses. Why stick to the close up stuff. This isn't a 1:1, very few macros actually are, but it does the job. You don't have to get too close to butterflies which is rather handy
James tried with his autofocus 400mm and failed, I walked up, focused and one snap later!
Why stick to the small stuff
Another relatively cheap one to get, under £60 as they aren't that popular. Good all rounder to have at hand. Not my favourite length, I prefer 50's and 35's but still nice.