Orion Apex 127mm Maksutov-Cassegrain Telescope

Orion Apex 127mm Maksutov-Cassegrain Telescope
Item # OR-9825
4 Questions(s)

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  • The Orion 127mm Apex is a compact Maksutov-Cassegrain telescope that can be used in the daytime use as a versatile spotting scope capable of high magnification views, but works great for astronomy as well.
  • During the night, the Orion Apex 127 provides sharply detailed views of the Moon, brighter planets such as Mars, Jupiter, and Saturn as well as open and globular star clusters and cloudy nebulas.
  • The Orion Apex 127mm OTA includes a 25mm Sirius Plossl 1.25" eyepiece, a 6x30 finder scope, a 45-degree correct-image diagonal, a soft carry case, Starry Night astronomy software, and more!


Orion Apex 127mm Maksutov-Cassegrain Telescope OTA

Usually in terms of what you can see, bigger telescopes are better. But bigger telescopes also require bulkier, heavier mounts and tripods to keep them stable, and consequently, an equally brawny owner to lug it around - not to mention more storage space.

Enter the Orion Apex 127mm Maksutov-Cassegrain Telescope. It boasts big 127mm (5")-diameter optics but in a telescope tube that's a fraction of the length (just 14.5" long!) and weight (8.6 lbs.) of a Newtonian reflector or refractor telescope of similar aperture and focal length. That's the beauty of the Maksutov-Cassegrain telescope optical design - it's so wonderfully portable.

It's those same high-performance optics that give the Orion Apex 127mm Maksutov-Cassegrain Telescope such outstanding image quality and such an incredible range of uses for the demanding observer. It gulps in 55% more light through its multi-coated, 5" meniscus lens than that of a 4" telescope, putting it in the big leagues for astronomical observation and advanced nature study. And the 127mm Apex's long 1540mm (f/12.1) focal length provides 62x magnification with the included 25mm Sirius Plossl telescope eyepiece (1.25"), and lets you push the power up to 250x with optional eyepieces! Bright views of star clusters and nebulas at low power, stunning lunar and planetary detail at higher power - it's all in a night's work for the Apex 127mm Maksutov-Cassegrain telescope.

As a daytime spotting scope, it would be hard to find a telescope that is more capable, especially in low-light conditions. It couples quickly to any sturdy equatorial mount or photo-style tripod. Thanks to a built-in threaded 1/4"-20 adapter plate, mounting and disassembly are a snap.

Quality is evident not only in the optics of the Apex 127mm Maksutov-Cassegrain, but also in the black-anodized aluminum front and rear castings, the smooth-turning focus knob, and the extruded aluminum tube, with a classy, metallic-burgundy finish. The included 6x26 achromatic, correct-image finder scope features a quick-release aluminum bracket with a dovetail base and two-screw X-Y alignment. For great daytime views with proper left/right and up/down orientation, the included 25mm Sirius Plossl telescope eyepiece slips into a 45° correct-image prism diagonal, which is also included. You might also be interested to know that the T-threads on the eyepiece adapter allow attachment of a 35mm camera body (with optional T-ring) to the telescope for powerful telephoto photography.

As if all that weren't enough, Orion also includes a fully padded, nylon/polyester telescope carrying case, which has plenty of room for additional accessories in the zippered side pockets.

Unencumbered with complicated gadgetry like you find on competing models, the Orion Apex 127mm Maksutov-Cassegrain Telescope offers hassle-free, big-aperture performance and convenient portability, at a price that's too good to pass up!

Orion 127mm Apex Specifications

  • Optical design: Maksutov-Cassegrain
  • Finder scope magnification: 6x
  • Optical diameter: 127mm
  • Finder scope lens diameter: 26mm
  • Focal length: 1540mm
  • Focal ratio: f/12.1
  • Eyepiece: Sirius Plossl 25.0mm (1.25")
  • Magnification with included eyepiece: 61x
  • Resolving power: 0.91 arc sec
  • Lowest useful magnification: 18x
  • Highest useful magnification: 254x
  • Highest theoretical magnification: 254x
  • Limiting stellar magnitude: 13.2
  • Optical quality: Diffraction limited
  • Finder scope: 6x26 Correct-image
  • Focuser: Internal
  • Diagonal: 1.25" 45° Prism Correct-image
  • Secondary mirror obstruction: 39mm
  • Secondary mirror obstruction by diameter: 31%
  • Secondary mirror obstruction by area: 9%
  • Mount type: Optical Tube without Mount
  • Astro-imaging capability: Lunar & planetary
  • Tube material: Aluminum
  • Length of optical tube: 14.5"
  • Weight, optical tube: 8.6 lb
  • Additional included accessories: Optical tube carry case
  • Warranty: One year

Additional Information

Additional Information

SKU OR-9825
Manufacturer Orion
Telescope Series Orion Apex
Optical Design Maksutov-Cassegrain
Mount Type None - Optical Tube Only
Warranty 1 Year Warranty
Telescope Aperture 127mm
Telescope Focal Length f/12.1
Telescope Focal Ratio 1540mm
Highest Useful Magnification 254X
Limiting Stellar Magnitude 13.2
Tube Color or Finish Orion Maroon Pearl
OTA Mount Type Photo Tripod Adaptable
Length of Optical Tube 14.5"
Optical Tube Weight 8.6 lb
Tripod Type Included None, Sold Separately
Eyepiece(s) Included 25mm Sirius
Case Included? Yes
Diagonal Included? Yes - 1.25" Erect Image Diagonal
Dew Shield Included? No, Sold Separately
Power Adapter Included None - Does Not Require Power
Finder Included 6 x 26 Optical Finder
Included Items

Included Items

  • Orion Maksutov-Cassegrain Telescope Optical tube assembly
  • 25mm Orion Sirius Plössl telescope eyepiece (1.25")
  • 45º correct-image diagonal
  • Orion 6x26 correct-image finder scope
  • Finder scope bracket with O-ring
  • Dust cap
  • Soft telescope carry case
  • Starry Night special edition software
Questions & Answers

Product Questions

What size (series) is the dovetail that comes with the Orion 127mm Apex? Thank you.
Hi, I purchased this telescope and didn't realize that it would not connect to the tripod that I use for my Nikon cameras. Could you recommend an appropriate tripod for this telescope?

Also, I plan to get a T mount to attach a Nikon D70 to the telescope. Do you know if I need to get a spacer as well?
Which dew shield fits this scope?
First, is the vixen mount same as the Celestron CG-5 mount (found on most nexstar OTAs) and Second, will the Orion Apex fit on the tripod used with a Celestron Evolution Nexstar 8" ?
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