Things are still a bit messy on the blog as it is imported from my old website. If you’ve ever done this, you know that these transitions never go as smoothly as they claim. A few links may still be broken. Thanks for your patience.
What is fast glass?
This post will explain what lens speed is all about. Lenses all have a maximum aperture. The maximum aperture is the widest opening the lens can have. The wider the lens opening the more light it will let in to the camera sensor. Here is a graphic representing apertures: