Protecting Lens

Some times, when you are working with a microscope over heat, steam and particles, you need a ring adapter with a glass for protecting the microscope lens.
When you use an Ring Adapter, you can use a Ring Adapter with Glass.
When you use an auxiliary lens, you can use a clear cover of protecting the Auxiliary lens.

(#2331) Protecting Lens For all of OD 49.5mm auxiliary lens.