Canon 100-400 IS II – Aperture Vs. Focal Length

It’s rare that I go anywhere without the Canon 100-400 f/4.5-5.6 L IS II in my bag. It’s a versatile and extremely sharp lens that’s just as capable at capturing detailed landscapes as it is with wildlife. One of the reasons I love it is that it fits such a large zoom range into a relatively small package, although at 5.1lbs you’ll definitely notice it in your bag after a long day. The reason that it’s possible to get such a wide range into a small lens is of course because this lens has a variable aperture. At 100mm, the