Video gallery: Field diaphragm (iris diaphragm), microscope part for the Steindorff Berlin Model C.Y.N. microscope
This page collects every video recording of the item: Steindorff Berlin microscope field diaphragm (iris diaphragm). Each recording can be opened on its own page.
All of it refers to one particular item, listed in the microscopeparts.eu catalogue under index 00797. The same item is also shown in photographs - the photo gallery holds 10 photos.