Firsts are always an exciting thing. Now, world’s first? That's another category in and of itself. At Fstoppers, we had the pleasure of testing Sigma's brand new 28-45mm f/1.8 DG DN Art lens for Sony E mount. A behemoth of specs in a tiny package. So, of course, we had to take it somewhere epic—and what better place than the lush, dark, and moody ancient forests of central Pennsylvania?