The free SynScan Pro app that controls the GTi is available for both iOS and Android. Users connect their device to the mount through its internal Wi-Fi hotspot. A polar scope utility in the SynScan Pro mobile app displays exactly where to position Polaris (or stars in Octans in the Southern Hemisphere) for quick and precise polar alignment. Note that the app also has a red screen mode. The SynScan Pro app acts as an intervalometer for DSLR or Mirrorless camera users with the appropriate SNAP cable connecting the mount to the camera to fire the shutter. After connecting my Canon EOS Ra camera to the GTi's SNAP port and setting it to Bulb mode, it was easy to program a sequence of images. One caveat to this feature is that the app must stay running and connected to the GTi to execute the entire sequence - you can't have your device go into power-saving mode while firing exposures. Make sure the tablet or smartphone you're using is fully charged before starting an imaging session. The mount's unguided tracking performance was quite good with telephoto lenses up to 200-mm focal length. The mount consistently delivered round stars in exposures up to 90 seconds with this lens paired with my Canon EOS Ra. Stepping up to the FS-60 refractor and its 354-mm focal length, the mount's unguided tracking produced acceptable stars in exposures up to about 30 seconds duration. I also attempted unguided exposures with the 92-mm Stowaway at 494 mm and started seeing elongated stars in images longer than about 15 seconds. This scope is right up near the weight limit of the mount (and required a second counterweight). These might not sound like very long exposures, but they're more than adequate for live stacking many deep-sky objects (see page 58). To improve the Sky-Watcher mount's tracking, users can utilize ST-4-compatible autoguiders and issue corrections in both axes - another big advancement over the earlier Star Adventurer models. Autoguiding with a 50-mm guidescope on top of my FS-60 yielded perfectly round stars in exposures of any length The Star Adventurer GTi easily accommodates the author's Takahashi FS-60 refractor and piggybacked EvoGuide 50ED guidescope (reviewed in our June 2022 issue, page 70). The combination is well under the 5-kg weight capacity of the mount. sk yand tele scope .o r g * MAY 2023 67