Editing Objective (optics) (section)

===Mounting threads===
The traditional [[screw thread]] used to attach the objective to the microscope was standardized by the [[Royal Microscopical Society]] in 1858.<ref>{{cite journal|url=https://www.biodiversitylibrary.org/item/18835#page/276/mode/1up|journal=Journal of the Royal Microscopy Society|page=230|year=1915|title=Objective Screw thread|access-date=2021-12-01}}</ref> It was based on the [[British Standard Whitworth]], with a 0.8 inch diameter and 36 threads per inch. This "RMS thread" or "society thread" is still in common use today. Alternatively, some objective manufacturers use designs based on [[ISO metric screw thread]] such as {{nowrap|M26 × 0.75}} and {{nowrap|M25 × 0.75}}.