Laowa 100mm f/2.8 2:1 Ultra-Macro APO Lens - Canon EF Mount
10X Infinity-Corrected Long Working Distance (M Plan Apo L) Apochromatic Metallurgical Microscope Objective Lens Working Distance 6.4mm | View Solutions Microscope Store
DULENS APO 85mm F2.0 Apochromatic Full Frame Lens for Canon EF | eBay
How to identify apochromatic or achromatic lenses in telescopes - Quora
I Made An Apochromatic Telescope With Old SLR Camera Lens - YouTube