Hi,
On the picture of the darkfield 0.8 condenser in Wolgang's website it shows a small black hat/cap.
https://www.leitz-ortholux.de/komponenten_kondensoren.php
What is it and what is it used for: thank you.
Best, Maarten
Ha found the answer in an old thread: apparently the cap is an insert to use the condenser with objectives with higher na.
https://www.mikroskopie-forum.de/index.php?topic=14181.0
Best Maarten