You can facilitate your customers to zoom-in the product images of your e-store by using Magento 2 product zoom extension by Extendons. This extension enables you to select magnifier and lightbox zoom option to allow image zooming on your e-store. Magento 2 product zoom extension enables the variety of magnifier types which you can choose from the back office. Some of the types are the lens, zoom in or out, fade in/out etc. You can also enable light-box zoom which displays the images in a lightbox and customer can zoom in and out from there. It cost you only $59.