So you would like to use your iPhone to capture videos of your samples in the lab? The iDu LabCam Microscope Adapter for iPhone 7 Plus has you covered. It fits Nikon, Olympus, and other popular microscopes and lets you capture high quality images. This 10X iPhone microscope adapter lens fits into the eyepiece slot for easy adjustment.
Thanks to this adapter, you can mount your iPhone onto a microscope more conveniently.[Source]