3.5X-90X Simul-Focal Trinocular Zoom Stereo Microscope with LED Ring L – AmScope
PA-1AFZ-IFR07-3609NS Simul-Focal Trinocular Zoom Stereo Microscope - 0.7X-4.5X Zoom Range, 0.5X & 2.0X Auxiliary Lenses, 144-LED Ring Light, 2MP High Definition Digital Camera - Industrial Microscopes - Microscopy
Confocal microscopy - Wikipedia
Microscope World Blog: Microscope Focal Length
Amazon.com: AmScope 3.5X-90X Simul-Focal Stereo Zoom Microscope on Boom Stand with 144-LED Ring Light and 18MP USB3 Camera, White (SM-4TPZ-144-18M3) : Electronics
Solved In a microscope of the type shown in the figure, the | Chegg.com
Confocal microscopy - Wikipedia
7X-45X Simul-Focal Stereo Zoom Microscope on Boom Stand + LED Ring Light + 10MP 840979121920 | eBay