Camera lens material?

ludzon

How can I achieve the kind of material like on this picture? I mean the glass of the lens

https://www.marmoset.co/posts/physically-based-rendering-and-you-can-too/ 

Thanks in advance.

EarthQuake

You can add this material by going to the material preset dropdown and selecting Glass Simple. This method is a bit outdated though.

In Toolbag 3.02, we added a refraction shader, which can be used by changing the transparency method to refraction. We don't have a tutorial for using this yet but you can see it in action here: https://www.marmoset.co/posts/toolbag-302-now-available/