Logitech C920 Wide Angle Adapter

This is a wide angle adapter for a Logitech C920 Webcam.

The camera is touted as a wide angle but it's not really wide enough for my taste. We use this camera in my living room to Skype with family and with kids running around it never captures everyone.

I bought this lens off of Amazon: https://www.amazon.com/gp/product/B003UKRJG0

And with this adapter it makes it's VERY widescreen. The only downside is that it will create a vignetting effect (a black circle) around the outside of th