- 4" / 102mm Aperture
- 1300mm Focal Length, f/12.7 Focal Ratio
- Limited-Diffraction Optical System
- Anti-Reflection Fully Multicoated Optics
- Internal Primary Mirror Focusing System
- 25mm & 10mm 1.25" Eyepieces
- 1.25" 90� Star Diagonal
- Red Dot Finderscope
- Vixen-Style Dovetail Plate
Similar to their Schmidt cousins, this 4" f/12.7 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 1.25" back focus and to get users started, Sky-Watcher includes a 25mm eyepiece with a 1.25" barrel that produces 52x power, a 10mm for 130x, 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
-
- 4" / 102mm aperture
- f/12.7 focal ratio
- 1300mm 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
-
- Requires user-supplied mount and tripod
- Vixen-style dovetail plate
- OTA and accessories weigh 4.6 pounds
- Focuser
-
- Internal primary mirror focus
- 1.25" diameter visual back accepts larger eyepieces
- Large rubberized focus knob
- Optical Accessories
-
- 25mm 1.25" eyepiece yields 52x power
- 10mm 1.25" eyepiece yields 130x power
- Red dot finderscope
- 1.25" 90� star diagonal
UPC: 050234115100
In the Box
Sky-Watcher 4" f/12.7 Maksutov-Cassegrain Telescope (OTA Only)
- 90� Star Diagonal, 1.25" Barrel
- 25mm Eyepiece, 1.25" Barrel
- 10mm Eyepiece, 1.25" Barrel
- Red dot Finderscope
- Limited Two-Year Warranty
| Optical Design | Maksutov-Cassegrain |
| Aperture | 4" / 102 mm |
| Focal Length | 1300 mm |
| Focal Ratio | f/12.7 |
| Eyepiece Barrel Diameter | 1.25" |
| Diagonal | 90� star |
| Finderscope | Red dot |
| Tripod | None |
| Mount Type | Vixen-style dovetail plate |
| Power Source | N/A |
| Optical Tube Dimensions | Not specified by manufacturer |
| Weight | 4.6 lb / 2.1 kg |
All product and company names are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.
