AmScope PA4X 4X Plan Achromatic Microscope Objective

They flattened the field of view.

The Plans expand image sharpness from just the center, to the entire field of view. If youre strictly visual you probably dont need to buy these (though I would). If you image, these are a nice upgrade.

Bought the 4x, 10x, and 40x Plan objs. They are excellent. Much better focus towards the edges.

I really hate this rating system, if you do what you need to make a sale, and not piss off your customer you get praised!

I get a clear 228lp/mm or 2.19 line width (not line pair width) verified resolution [see image - chromium on glass test target, group 7 line 2 is 228 lp/mm) from this little guy using white light table (no condenser) - which is quite good given that the Rayleigh criterion for blue light (450nm) suggests resolution of 2.74 for NA of 0.1 as this objective is. Granted, Rayleigh criterion is not the strictest but for $24 this is pretty amazing.

Lo he usado y es muy buena óptica

This is OK. Not parfocal with other older objectives.

All very well, excellent article wrap ... Shipping arrived super fast

Storage container arrived cracked. Shipping package was a padded envelope and inadequate to protect contents.

Exactly what I wanted. No problems with delivery or quality. Thank you!