A phone call or email is all it takes, no instructions required it is an objective lens, you screw it into the hole where the other three objectives are fitted............. Seriously you left a 3 star review for this?
“An excellent acquisition, my 100x oil objective works well but makes it impossible to swap back to a HPF (40x) when surveying a slide. Now I can go between 40x and 100x as required.
The 100x is much longer than my oil immersion equivalent which requires care re-focusing in a change-over. I note that the 100x dry has a retractable front lens so that damage to the slide is minimised if focusing is extreme and touches the cover slip.”
