No, it has nothing to do with sparkly vampires (thankfully).
Here are what all those terms you hear being bandied about actually mean.
It's not quite as simple as it sounds...
When people talk about "aberrations" in relation to gun optics, here's what they mean.
The next in our series about optical sights.
The basic knowledge that will let you know what's what when discussing riflescopes.
We answer the questions you were too embarrassed to ask.