Deep dive into repairing modern camera lenses reveals complexity beyond DIY

A detailed teardown of a Sigma 45mm lens shows why contemporary optics are nearly impossible for hobbyists to service—sealed construction, proprietary parts, and delicate calibration make repairs a specialized domain. For makers interested in hardware, it's a sobering look at how modern manufacturing and design priorities (cost, weather sealing) have eliminated the repairability margins that defined older gear.