I came across two Canon SX50 HS digital cameras in a junk box at work. Customers sometimes donate non-working electronics to use as parts, or to recycle. I was told by the boss that anything I wanted, and could repair I could have. I repaired both and took one home to use.
I had never worked on this model digital camera before, so I searched the internet for information. I found a video on YouTube of a near full disassembly, and repair of this model. Jay Gould made the video, and did an incredibly thorough job.
I am running the camera through its paces, and testing all the still and video functions. So far I have found the glass to be incredibly sharp throughout the zoom range. Canon incorporated its USM focus and image stabilization in this camera, and it works well even hand holding at 50X optical zoom. (See test images)
Video is 1080p and is sharp and clear, with no focus drift.
It is amazing what you can find in a junk box.