iOptron 'Bosma' 6'' Rumak Maksutov-Cassegrain Telescope
iOptron 'Bosma' 6'' Rumak Maksutov-Cassegrain TelescopeiOptron 'Bosma' 6'' Rumak Maksutov-Cassegrain TelescopeiOptron 'Bosma' 6'' Rumak Maksutov-Cassegrain Telescope
iOptron 'Bosma' 6'' Rumak Maksutov-Cassegrain TelescopeiOptron 'Bosma' 6'' Rumak Maksutov-Cassegrain Telescope

iOptron 'Bosma' 6" Rumak Maksutov-Cassegrain Telescope

  (1 Review)
✓ 2 year warranty


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About this product

Model:  iop_mak_6101
Part Number:  6101

150mm f/12 Rumak Maksutov-Cassegrain Telescope

An excellent choice for observing or imaging the Moon and planets. 

Fully multicoated f/12 Rumak Maksutov optics and interior baffles deliver high-contrast views similar to a 5-inch apochromatic refractor, at a fraction of the cost! 

The only Maksutov telescope of its kind that includes a dual-speed focuser for fine-tuning focus.  

It also includes a solar filter that fits over a sub-aperture integrated into the front cap. 

Gregory vs Rumak


Most Maksutov telescopes available today (i.e. from Sky-Watcher, Celestron & Meade) are Gregory Maksutovs, where the secondary mirror is a simple aluminised circle essentially glued onto the interior surface of the corrector lens. Therefore the curvature of the secondary mirror is always the same as the curvature of the corrector lens. From an optical design perspective, this is a compromise that enables high-contrast Maksutov optics to be manufactured at lower prices. 


The Rumak Maksutov, named after its designer Harry Rutton, is more sophisticated. A Rumak's secondary mirror is distinct and separate from the corrector lens, so the optical designer has more freedom to enhance performance. Typically, for the same focal length, a Rumak Maksutov has a flatter field and tighter stars when compared to a Gregory Maksutov. This makes the Rumak Maksutov an excellent choice for lunar/planetary astrophotography.

NOTE: Photos show the earlier iOptron branded version manufactured by Bosma. The telescope supplied is the same but branded Bosma. This version no longer includes the dew shield mentioned in the manual.



  • Rumak-type Maksutov-Cassegrain optics
  • BK-7 optical glass primary mirror, Rumak-type secondary mirror, and Maksutov meniscus corrector lens
  • Aluminised and quartz-overcoated primary and secondary mirrors
  • Moving primary mirror focusing via a dual-speed focuser
  • Vixen-style dovetail mounting rail
  • 8x50 straight-through finderscope in a quick-release mounting bracket
  • Solar filter (fits over a sub-aperture integrated into the front cap)
  • T-ring adapter is included for attaching a camera
  • Adapter Ring for Schmidt-Cassegrain Accessories
  • Two-year limited warranty
  • Optional iOptron Electric Focuser


Telescope Field of View Simulator

What's in the box

  • iOptron MAK 150mm f/12 Rumak Maksutov-Cassegrain Telescope (OTA)
  • Threaded Accessory Holder
  • 2" Eyepiece Holder
  • 2" to 1.25" Adapter
  • 8x50 Finderscope with Bracket
  • Solar filter (fits over sub-aperture in front cap)
  • Front Lens Cover
  • T-Ring Adapter
  • Fitted Vixen-type dovetail bar


Optical Design Catadioptric Rumak style Maksutov-Cassegrain
Clear Aperture 150mm
Focal Length 1800mm
Focal Ratio f/12
Resolving Power 0.77 arc seconds
Limiting Magnitude 12.8
Highest Useful Magnification 300x 
Finder scope 8x50 w/ finder ring
Focuser Dual-speed 10:1 Crayford 
Tube Length 21 3/4”
Tube Weight 13.4 lbs (6.1 kg)
Astrophotography T-ring adapter included for attaching a camera
Other Accessories 2” to 1.25” compression ring accessory holders; 
Adapter Ring for Schmidt-Cass Accessories
Dust Cover Light reducing lens cover
Gross Weight     22 lbs (10 kg)
Warranty Two year limited

Downloads / Manuals


IOptron 150 Maksutov Instruction Manual

Collimation Instructions

Customer reviews

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6" Cassegrain
08 June 2020  | 

A really high quality product, well made and finished. Tested it on the moon which was the only bright object available, first class results! My main reason for purchasing was the difficulty in handling my 6" refractor, the Cassegrain is equal in performance and much much easier to handle. FLO are a first class company to deal with, they did everything as stated and on time!


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