The Konusmotor 90 equatorial refractor telescope is an impressive telescope for a very reasonable price. At about 30 pounds, this is an adult-size telescope. The orange and black optical tube is 40 inches long, and the sturdy equatorial mount and tripod stands nearly 5 feet tall. The very complete accessory package includes a 6x30 finder scope, two plossl eyepieces, an electronic tracking motor, and even a large-format lunar map and moon filter.
Refractors are known for their sharp, high-contrast views of the moon and planets, and the Konusmotor 90 includes everything I need to get sharp views of the moon right out of the box. The low-power 17mm plossl eyepiece (58x) shows a nice overall view of the moon, while the 10mm plossl (100x) can be used to zoom in for more detail. When the quarter moon is in the sky, I like to look for detail along the "terminator," the dramatic boundary between bright sunlight and dark shadow. At 100x, the Konusmotor 90 shows me a great view of the "straight wall" in Mare Nubium. The straight wall lies between the craters Birt and Thebit, numbers 179 and 181 on the Konus moon map.
Brighter deep space objects also show up nicely in the Konusmotor 90. On a moonless night, I like the way the 17mm plossl eyepiece frames the ghostly glow of the Orion nebula. Zooming in with the 10mm eyepiece, I can easily pick out all four stars of the Orion nebula's embedded multiple star, the Trapezium. The moons of Jupiter and the rings of Saturn are easy to see with the 10mm plossl eyepiece (100x). With careful focusing, I was even able to detect the Cassini division in Saturn's rings using my own Ultima 7.5mm eyepiece. Low-cost refractors like the Konusmotor 90 can be troubled by false color and spherical aberration, but I find these effects are well controlled at moderate powers. When I look at Jupiter and Saturn at magnifications over 100x however, the images are not as sharp as I see with my C102HD refractor.
The standard equipment plossl eyepieces are a good match for the optical quality of the Konusmotor 90. I'd suggest adding a low-power 25mm plossl to take in the full view of deep space highlights like the Andromeda Galaxy, the Pleiades, and the Double Cluster in Perseus. The electronic motor drive included by Konus comes in handy when sharing the telescope view with others without having to constantly adjust the slow-motion knobs by hand. I find the motor to be a mixed blessing because the slow-motion knobs and the motor cannot be used at the same time. In practice, when observing by myself, I often don't use the motor. --Jeff Phillips
Pros:
- High-contrast views of the moon and planets <li>Durable, low-maintenance design
- Everything is included, even the batteries
Cons:- Equatorial mount wobbles a bit while focusing <li>Planet views could be sharper at powers over 100x ul>