First Timer High Resolution Objective Recommendation

[WilliamW]

These two posts seem to reference the same lens:

40x Objective Can’t Focus

I just got my microscope camera working with the “High Resolution Optics”. I am trying to scan droplets of algae culture on slides, looking up from underneath with a 40x plan objective (link below). I have used many inverted scopes before for this without difficulty, but I am finding that when I try to get the objective close enough to focus on the algae in the droplet, even those sitting on the top surface of the slide, the objective bumps against the bottom of the slide before the image come…

Objective supplier

You can find affordable and decent enough objective lenses from North American suppliers. Here’s an example: Since you’re not totally sure what to look for, I can’t recommend either Aliexpress or eBay. You can get good deals on eBay but you really have to know what you’re doing.

I don’t know if they were actually used.