I have an old SWIFT 15-60x zoom spotting scope/telescope, built like a brick outhouse. They were used by the military back in the sixties. It uses T-mount system to mount cameras. I finally got around to testing it on a rock solid tripod and solid alt-az mount, using a fence grille as a target, in the distance. I hade to put my Nikon in live view mode to stop camera shake from mirror bounce. Sad to say its only a fair result at 15x and get softer and more purple as one goes up to 40x. Beyond that its getting too dark. So this scope won’t be used for photography.