Field Performance
The TPO 180 Ultra Wide (identical to the Askar FMA180) is a marvel of miniaturization. At its core is a 40mm triplet objective using two ED glass elements. What makes this system special is its modularity; in its native state, it is a 220mm f/5.5 triplet, but when you attach the included dedicated three-element reducer, it transforms into a 180mm f/4.5 sextuplet astrograph with a perfectly flat field.
Weighing less than a pound, this is the ultimate 'travel scope' that fits in a coat pocket. Despite its size, it provides an impressive 44mm image circle, making it compatible with full-frame sensors. While the helical focuser requires a delicate touch compared to a rack-and-pinion, the stars remain remarkably tight across the field. It is the perfect companion for ultra-portable mounts like the ZWO AM3 or Sky-Watcher Star Adventurer.
- Ultra-portable (only 395g)
- Modular design (Visual, Guiding, or Imaging)
- Full-frame compatible 44mm image circle
- Includes dedicated reducer and extension tubes
- Helical focuser can be stiff in cold weather
- Small aperture limits reach on dim targets
- Sensitive to tilt due to short focal length