- 5" / 127mm Aperture
- 1540mm Focal Length, f/12.1 Focal Ratio
- Limited-Diffraction Optical System
- Anti-Reflection Fully Multicoated Optics
- Internal Primary Mirror Focusing System
- 28mm LET 2" Eyepiece
- 2" 90° Star Diagonal
- 6x30 Straight View Finderscope
- Vixen-Style Dovetail Plate
Similar to their Schmidt cousins, this 5" f/12.1 Maksutov-Cassegrain Telescope from Sky-Watcher exchanges the front corrector plate with a convex meniscus lens which not only eliminates the need for periodic collimation, but the nature of the lens requires a smaller secondary mirror which limits obstruction and increases contrast. The Mak-Cass optical path results in a slower focal ratio and narrower field of view versus a similar Schmidt-Cass, but the optical benefits makes this an ideal scope for planetary and double-star observation.
The scope is outfitted with a 2" back focus and to get users started, Sky-Watcher includes a 28mm eyepiece with a 2" barrel that produces 55x power and a 90° star diagonal for viewing with the OTA pointed at or near the celestial zenith. The OTA is offered here without a mount or tripod for users that have a platform, or want to use it as part of a dual-OTA set up for star-parties or observation/imaging rigs. It is outfitted with a Vixen-style dovetail plate for use with compatible equatorial or alt-az mounts. This OTA's compact form-factor belies its observation power and resolution and is ideally suited as a grab-and-go option for quick observation sessions or heading out to remote locations.
- Optical Performance
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- 5" / 127mm aperture
- f/12.1 focal ratio
- 1540mm focal length
- Front convex meniscus lens corrects spherical and chromatic aberrations, and comas (off-axis aberration) across the entire field of view
- Smaller secondary mirror versus Schmidt-Cassegrains reduces obstructions and increases contrast
- Anti-reflection fully multicoated optics reduce light loss for increased image brightness
- Mounting
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- Requires user-supplied mount and tripod
- Vixen-style dovetail plate
- OTA and accessories weigh 9.7 pounds
- Focuser
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- Internal primary mirror focus
- 2" diameter visual back accepts larger eyepieces
- Large rubberized focus knob
- Optical Accessories
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- 28mm 2" LET eyepiece yields 55x power
- 6x30 straight view finderscope
- 2" 90° star diagonal
UPC: 050234115209
| Optical Design | Maksutov-Cassegrain |
| Aperture | 5" / 127 mm |
| Focal Length | 1540 mm |
| Focal Ratio | f/12.1 |
| Eyepiece Barrel Diameter | 2" |
| Diagonal | 90° star |
| Finderscope | 6x30 straight view |
| Tripod | None |
| Mount Type | Vixen-style dovetail plate |
| Power Source | N/A |
| Optical Tube Dimensions | Not specified by manufacturer |
| Weight | 9.7 lb / 4.4 kg |
| Packaging Info |
| Package Weight | 12.8 lb |
| Box Dimensions (LxWxH) | 28.1 x 9.7 x 9.2" |
In the Box
Sky-Watcher 5" f/12.1 Maksutov-Cassegrain Telescope (OTA Only)
- 90° Star Diagonal, 2" Barrel
- 28mm Eyepiece, 2" Barrel
- 6x30 straight view Finderscope
- Limited Two-Year Warranty
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