
Sky-Watcher Skymax 90 (S11500)
If you’re seeking crisp, contrasty views with high levels of detail, look no further than the Skymax series, Sky-Watcher’s premiere line of Maksutov-Cassegrains. Generally regarded as producing a sharper image than Schmidt-Cassegrains, Maksutovs offer astronomers a large visual aperture, high contrast and long focal length in a compact package.
Description
These telescopes deliver higher levels of planetary detail due to a focal length that is 5-7 times longer than your average Newtonian or refractor telescope.
Skymax Maksutovs feature mirrors constructed of borosilicate, polished and coated with our proprietary Radiant™ Aluminum Quartz™ (RAQ™) coatings, which produce a remarkable 94% reflectivity. All Maksutovs use a corrector plate to help reduce chromatic aberration, which is then coated using our signature Metallic High-Transmission Coatings™ (MHTC™), producing professional grade optics at an affordable price.
Quick Overview
- Maksutov-Cassegrain optical design
- Primary and secondary mirrors feature proprietary Radiant™ Aluminum Quartz™ (RAQ™) coatings
- Corrector plate featuring Metallic High-Transmission Coatings™ (MHTC™) virtually eliminates chromatic aberrations
- 90mm aperture, 1250mm focal length, f/13.8 focal ratio
- Aluminum tube coated with glossy, black diamond metal-flake finish
- Included accessories: two 1.25-inch eyepieces, red dot finder, 1.25-inch diagonal, ¼-20 mounting plate, and a soft carrying case
What's In the Box
- Two 1.25-inch eyepieces
- Red dot finder
- 1.25-inch diagonal
- ¼-20 mounting plate
- Soft carrying case
Specifications
Optical Info | |
Optical Design | ED Triplet Refractor |
Lens Coatings | Fully Multi-Coated |
Glass Type | BK7 (2)/FPL-53(ED) |
Primary Aperture (mm) | 150 |
F/Ratio | 7 |
Focal Length (mm) | 1040 |
Observational Info | |
Dawes Limit | 0.77 |
Rayleigh Limit | 0.93 |
Limiting Mag. | 13.4 |
Minimum Magnification | 21 |
Maximum Magnification | 295 |
Light Gathering (compared to next size down) | 56% |
General Info | |
Focuser | 3.4" Dual Speed R&P |
OTA Length (Retract/Ext.) | 36.9"/40.5" |
OTA Outer Diameter | 7.9" |
OTA Weight (with accessories) | 32 |
Accessories | |
Included Finder | 8x50 RACI |
Included Diagonal | 2" Dielectric |
Mounting Accessories | Rings/D-Rail |
Included Eyepieces | None |
Included Case | Yes |
Corrector | Yes |