The Shadowrun answer to this is that range of magic is infinite, as long as you see the original image. Therefore, telescopes, microscopes, optic lenses, even fibre optic cables are fine, as long as the image is purely "analog" optical and never digitized; but any kind of computerized or video system breaks the link.
The real bitch of this is that it directly leads to the idea of a security setup where a mage sits in a room somewhere in the building, with an optical (not digital) switch that links a pair of goggles or magnifying screen to fibre-optic cables running to fisheye lenses in the ceiling of every room in the building. So when a security guard watching his motion detectors or video banks notices movement, he tells the wizard what room it's in, and the wizard switches the goggles to that lense, and *poof* they're targetable. Cunning PCs will abuse this heartily.