I stumbled across a broken Sigma 45mm f/2.8 Art lens for a very cool $58.65 USD that I simply could not resist. I've been eyeing an AF lens in the 50mm range for my recent endeavors with L-mount cameras and this looked like the perfect fit. This lens is commonly found as a kit with the very excellent full-frame Sigma FP camera series. Here is my comprehensive guide to bringing the lens back into service. I delve into the nitty-gritty details of lens PCB repair and lens disassembly techniques.