Sky-90 is a short tube fluorite apochromat from Tak, focal ratio of f/5.6 & tube length of 350mm, which is ultra-portable & versatile. It is fully multicoated and uses knife edged baffles to produce highest contrast. The 2.5" focuser & newly designed compression ring adapter allows the use of any combination of 1.25" or 2" diagonal-eyepiece combinations.
When coupled with the f/4.5 flattener/ reducer, the Sky-90 can be used as an astro camera or ultra-wide field instrument. Besides star-gazing, its very short length makes it a portable high quality telescope for birding or for toal solar eclipse photography.
The Sky-90 fits easily into any airline overhead compartment. The optional rigid soft case provides protection for this 3.2kg instrument.

A Sky & telescope review called it "an ideal travelscope for mobile observers, providing maximum performance at minimum size." It makes a great traveler scope that you can stow away anywhere