I've had good luck with molded plastic aspherical lens. Edmund Optics is an excellent source:

https://www.edmundoptics.com/optics/optical-lenses/aspheric-lenses/Precision-Molded-Aspheric-Lenses/

They have lenses as small as 1 mm diameter although there are more options around 5 to 6mm.

I've had good luck with molded plastic aspherical lens. Edmund Optics is an excellent source:

https://www.edmundoptics.com/f/Precision-Molded-Aspheric-Lenses/14752/

They have lenses as small as 1 mm diameter although there are more options around 5 to 6mm.

I've had good luck with molded plastic aspherical lens. Edmund Optics is an excellent source:

https://www.edmundoptics.com/optics/optical-lenses/aspheric-lenses/Precision-Molded-Aspheric-Lenses/

The have lenses as small as 1 mm diameter although there are more options around 5 to 6mm.

I've had good luck with molded plastic aspherical lens. Edmund Optics is an excellent source:

https://www.edmundoptics.com/optics/optical-lenses/aspheric-lenses/Precision-Molded-Aspheric-Lenses/

They have lenses as small as 1 mm diameter although there are more options around 5 to 6mm.