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Konus's MotorMax-90 90mm f/13.3 Maksutov-Cassegrain Telescope employs a front convex meniscus lens which not only eliminates the need for periodic collimation, but also requires a smaller secondary mirror when compared to a Schmidt-Cassegrain design. The Mak-Cass optical path results in a slower focal ratio and narrower field of view versus a similar Schmidt, but the optical benefits makes this an ideal scope for planetary and double-star observation.
The scope is outfitted with a German equatorial mount and features a Right Ascension motor to track objects during extended observation sessions. To make manual adjustments, there are also RA and Declination cables. Utilizing the RA motor not only frees you to concentrate on observation, it also greatly reduces vibration - especially at higher magnifications - for clearer viewing.
An internal flip mirror redirects the light path from the eyepiece holder on top of the OTA to the visual back, and for more comfortable viewing a 45° star diagonal is also included. The scope comes with two eyepieces that produce 70x and 120x power as well as a moon filter to safely observe the Moon.
3.5" (90mm) aperture
f/13.3 focal ratio
1200mm focal length
Compact Maksutov- Cassegrain optical design
Front convex meniscus lens helps to correct for spherical aberration for reduced distortion at the edges of the field of view
Anti-reflection multicoated optics to reduce light loss and increase contrast and image brightness
Internal flip-mirror directs optical path from visual back to upper 90° eyepiece holder
German equatorial mount
Right Ascension tracking motor, runs on one 9V battery
Manual RA and Declination slow motion cables
Bar and counterweight for proper balancing
Aluminum 2-stage tripod, adjusts from 29-48" high
10mm focal length, 1.25" diameter barrel, eyepiece: 120x power
17mm focal length, 1.25" diameter barrel, eyepiece: 70x power
45° star diagonal, 1.25" barrel, for viewing through the visual back
Moon filter for safe observation, especially during full phases
8x21 straight-view finderscope
In the Box
Konus MotorMax-90 90mm f/13.3 Maksutov-Cassegrain Telescope with RA Motor