Your search "mark" resulted in 3 Articles
The only problem with the great Holga-Lenses is that you can't see the focus-settings. I found a really easy way to mark it and resolve this issue.
DIY Project #43: Tape Marker Monster ended about 1 year agoAlong with our La Sardina DIY camera we’d like to present several DIY projects to inspire you. This project is a tutorial on how to make a tape marker monster by Onel. Have fun!
If you have a bad memory just like me, simply mark down which kind of film you have currently loaded.