Perfect for ST-80. I used it for a Borg 76ED grab and go, it was great, but I sold that scope so this can go. I bought it new in September, with three Quick release plates, spent over $200. Will sell complete package for $165 OBO. This is like new with box, no marks at all, a very convenient smooth mount that you can use with cameras with long lenses, or 90mm SCT, or ST-80s. Head only, no tripod.