More Information  · Supplied Accessories Price $299.00 $399.00 SAVE: $100.00 (25%) Shipping $30.00 Highest Useful Magnification 195x Visual Limiting Magnitude 12.3 Focal Length 1250mm Focal Ratio f/13.9 Resolution 1.29 arc seconds Aperture 3.5" Net Weight 12.65 lbs. Ship Weight 23 Heaviest Single Component 5.3 lbs. Warranty 1 year

• 90mm f/13.9 multicoated Maksutov-Cassegrain optics
• battery-operated go-to altazimuth mount with adjustable height tripod
• SkyScan computer hand control with 42,900 object database
• non-magnifying illuminated red dot finder
• 10mm (125x) and 17mm (74x) 1.25” Plössl eyepieces
• two soft carrying cases

This Konus Digimax-90 go-to Maksutov-Cassegrain telescope uses a lens and two mirrors to fold a high power 49” long optical system into a very compact 9” tube. This easily transported 90mm aperture Konus telescope is designed to automatically find and follow nearly 43,000 solar system and deep space objects for you – all the while showing you sharp detail in small bright objects, such as the Moon, planets, star clusters, and binary stars.

If you want to see more detail in faint nebulas and galaxies, however, the greater light-gathering capacity of a larger aperture reflector might be a better choice than this 3.5” aperture Konus specialist scope. For the solar system enthusiast, however, it’s hard to beat the sharply detailed and spurious color-free optics of a good Maksutov such as this Konus.

The Konus scope’s go-to equatorial mount has an adjustable height tripod. A convenient battery-operated dual-axis motor drive keeps the Moon and planets in the field of view for extended no-hands viewing sessions.

The 90mm Konus Digimax-90 go-to computerized Maksutov is not a scope for everyone. However, if you want to view the solar system in detail for not a lot of money, this may be just the scope for you.

This Konus Telescope’s Optical System . . .

• Compound optical design: 1250mm focal length 90mm aperture f/13.9 all-glass Maksutov-Cassegrain lens/mirror optical design. The optical tube weighs only 3.2 pounds, making it easy to transport and set up.

• Multicoated optics: The Maksutov corrector lens at the front of the scope has antireflection multicoatings on both sides of the lens for high light transmission and good contrast.

• Focuser: A knob at the rear of the optical tube moves the primary mirror back and forth internally to focus the telescope. The focuser is very precise, requiring twenty turns to go from its closest terrestrial focus to infinity, but only a few turns are required to move from solar system objects (such as the Moon) to objects at infinity (such as a star cluster).

• Star diagonal: A 90° viewing angle image-erecting 1.25” star diagonal provides a comfortable viewing position. The erect/right-reading image in the star diagonal is oriented the way you see the sky with your unaided eye, through the red dot finder, and on your star charts, making it easy to orient yourself to the heavens. There is no annoying reversed image as you find in conventional 90° star diagonals. The erect/right-reading images and the scope’s altazimuth mount also make the Digimax-90 a good choice for use as a terrestrial spotting scope.

• Two eyepieces: You get two good quality medium/medium high power 1.25” eyepieces – a 10mm (125x) and a 17mm (73.5x). Both eyepieces are a higher quality four-element Plössl optical design than you’ll find in most other telescopes in this price range. They have antireflection multicoatings on their lens surfaces for sharp images and very good contrast. Instead of providing low quality eyepieces that give unrealistically high (and often unusable) magnifications, Konus provides higher quality eyepieces with powers you can use and enjoy every night you take your Digimax-90 out to observe. Optional higher and lower power eyepieces are available to let you extend your magnification range significantly.

• Moon filter: You get a 1.25” green optical glass Moon filter that threads into the base of the eyepieces. It cuts the glare of the brightly lighted Moon and improves the contrast. This makes it is easier for you to see faint details that might otherwise be washed out by the brightness of the lunar surface.

• Red dot finder: An illuminated red dot finder attaches to the side of the optical tube. If properly collimated (aligned) with the view through the main telescope, the red dot of this non-magnifying finder will help you center distant objects in the telescope so you don’t have to search for them using the narrow eyepiece field of view.

The Digimax-90’s Mount . . .

• Go-to altazimuth mount: The sturdy Digimax single fork arm motorized altazimuth mount is designed for hands-free astronomical observing. It can be placed on a table top for backyard/patio use or mounted on its supplied adjustable height tripod for use in the field. Its supplied battery-operated dual motor drives automatically follow the motion of the planets and stars as they travel in curved paths from east to west across the sky. The single fork arm design is very stable and damps vibration of the lightweight optical tube quickly. The fork mount weighs only 5.3 pounds by itself, and a very transportable 8.5 pounds with the optical tube attached. There is a bubble level built into the mount base to improve the tracking accuracy.

• Dovetail tube mount: A dovetail foot on the optical tube slips into a dovetail slot in the mount’s fork arm, allowing fast set-up and take-down. There is a 1/4”-20 thread hole in the optical tube dovetail foot that lets you mount the optical tube on a conventional photo tripod for use as a terrestrial spotting scope.

• Motor drives: The supplied dual axis battery- or AC-operated right ascension and declination 12V DC servo motor drives can be set for a sidereal, lunar, or solar tracking rate to match the slightly different speeds at which the Moon, Sun, and stars move across the sky. This keeps objects from drifting out of the field during long observing sessions, or while several people in a row observe the same object. All drive gears, motors, and drive electronics are built into the Digimax mount body.

• Power requirements: The Konus Digimax-90 is powered by eight user-supplied AA batteries that fit into a compartment in the fork arm base. It can also be powered by an optional rechargeable 12V battery pack such as the 7 amp hour capacity Celestron Power Tank #4512V or by an optional AC power supply that is capable of providing a minimum of one amp 12V DC. The external DC input accepts a DC power cord that uses a 5.5mm female pin jack plug such as the 8’ long DC power cord provided with the Celestron Power Tank. There is a power on/off switch in the side of the base.

• Setting circles: There are no manual or analog setting circles to show you where in the sky the scope is pointing in right ascension (the east/west position of objects in the sky measured in hours and minutes) and declination (the north/south position measured in degrees). Instead, the hand control readout can display the celestial coordinates at which the scope is pointing whenever you are not using the computer to access its database. The digital readout is much more accurate than coarse and easily misread manual circles. The digital readout allows you to align the scope on the position of any object in the sky that is not in the database (such as a comet or asteroid). Simply use its r. a. and dec coordinates from the listings in magazines such as Astronomy and Sky & Telescope, rather than searching for it by star-hopping using the red dot finder and eyepiece. Setting circles can reduce the time it takes for you to find such interesting but ephemeral celestial objects.

• Slow motion controls: There are no manual slow motion controls on the Konus Digimax-90. Manual operation of the scope is done via the SkyScan hand control, using the built-in motor drives and the directional<