Double Convex Lens, 50mm Focal Length, 1.5" (38mm) Diameter - Spherical, Optically Worked Glass Lens - Ground Edges, Polished - Great for Physics Classrooms - Eisco Labs

All the specs are right. Glass quality is good. Faintest bit of "Window Glass" iron-green to the glass, but zero problems for my application. The size diameter micrometers exactly at 38mm as listed. I wanted objective lenses for a diy FPV headset like project, and wanted something better than plastic for the eyepieces. The edge grinding is even, and has no major chips etc. If what I'm building works out, I'm going to buy more.

I used these with some 3D-printed stereoscopes, and they work wonderfully! They have a high quality of construction, consistent size (important for fitting into oculars), and a nice finish. Great part for your DIY project!

They work my I got a quantity of 2 and they where different thickness

Worked as intended for a monocular. Thanks.

We have this $22K Hanamatsu microscope camera at work, the kind you put on a $400K microscope (that we don't have). We're writing software for it, but so far only imaging the back of the lens cap. With this double convex lens I designed and printed a simple C mount single-lens optic for the camera so that the developer can image something slightly more interesting, like the side of a tissue box (get the pun?). The lens worked as expected and the price was right

There is a bad flaw directly center of the glass. Maybe a defect, but definitely not good quality.

Good quality lenses

I ordered some almost exactly one year ago that's ~5mm thick at the edge. I finally got the design finished and ordered more for demo models to send out.... and the thickness of the lenses changed and it doesn't fit in the design anymore. Besides that it works pretty well.

El lente es pequeño y tiene gran aumento. Me funcionó muy bien para mi proyecto casero de óptica.