Focus Stacking and Photogrammetry Course: Introduction and Overview 

Thank you Mark for sharing your wealth of knowledge and experience

I commented on a different video, I know your gear now, Thanks!

Re: 14:15 A trick I recently learned is to put the lens and camera body inside a plastic bag to prevent dust contamination when you install a lens.

Any thoughts on the OM 90mm Macro? It just came out. With the 2x teleconverter it is 4X zoom with autofocus.