Lens Comparison: Canon 100-400mm Vs Sigma 150-500mm

I've recently bought myself a new lens, the Canon EF 100-400mm f4.5-5.6L IS USM, to use instead of my trusty Sigma 150-500mm f5-6.3 DG APO OS HSM.  I love the Sigma lens, so why the desire to change ...??

Look Mom - I'm Blogging!

Well, after many tests and trials to see what works and what doesn't, here we go - the big launch into the blogosphere! Is this going to revolutionise blogging and become one of the best read blogs out there? Absolutely NOT! Then why do it you ask (I'm sure you thought it even if you didn't actually ask it - besides, it'd be a bit strange if you did sit there and actually say it out loud - I can't hear you after all). Well, . . . .