I assume this is an accessory that temporarily replaces one objective and displays some sort of centering reticle/target which one can use to center the field and aperture stops of an epi illuminator. It probably also includes a mirror or prism. I don't know whether one needs an additional reticle/target placed in one of the illuminator filter slots, but the Olympus page did not mention this.
- What is this accessory called?
How does it work?
Is eBay item 264008030066 this kind of tool, or something else? (The description says it is only for use with Nikon inverted scopes)
What about eBay Item 152988679737?
Is it really necessary, or is there another way to accurately center an epi illuminator?