Why Purchase from All-Star Telescope?
Free Expert Support
Whether you are a first timer needing help with setting up or an enthusiast that can't quite make that one thing work, our expert staff are ready to support your needs. With decades of knowledge and first hand experience we've been there and we can help you through it!
Stress Free, Secure Transactions
You can trust purchasing and delivery with All-Star Telescope. All of our transactions are 100% secure and Level 1 PCI DSS compliant thanks to Shopify's ShopPay platform. For additional protection, we insure 100% of the value of every shipment we make. If it get's lost during shipment, we replace it. If it gets damaged during shipment, we replace it. We make sure your product arrives exactly as you would expect it to; we promise.
We also ensure privacy protection. We never keep any of your credit card information on file and any of your personal data is stored according to our policies.
30 Day Return Policy
Buy with confidence knowing that we accept returns up to 30 days after purchase. We want you to have something you will actually use and we are confident that we keep good quality products in our store with No Junk.
Price Match Promise
Shipping around for the best price is tough, we make it easier by offering the best pricing in the market. But if you find a better price on an in-store item somewhere else we will match it!
Product Description
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.
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.
What can I see with a Sky-Watcher Skymax 90 (S11500)?
Here are some simulated views of common objects. Results with your telescope will vary with viewing conditions, obrits, equipment and more.
Jupiter with
25mm Eyepiece - 50x Magnification
(Included with This Telescope)
Jupiter with
10mm Eyepiece - 125x Magnification
(Included with This Telescope)
Jupiter with
5mm Eyepiece - 250x Magnification
Sold Separately
Moon with 25mm Eyepiece
50x Magnification
(Included with This Telescope)
Moon with 10mm Eyepiece
125x Magnification
(Included with This Telescope)
Moon with 5mm Eyepiece
250x Magnification
Sold Separately
Andromeda with 36mm Eyepiece
35x Magnification
Sold Separately
Andromeda with 25mm Eyepiece
50x Magnification
(Included with This Telescope)
Andromeda with 10mm Eyepiece
125x Magnification
(Included with This Telescope)
What's in the Box
Specifications
| Optical Info | ||
| Optical Design | Mak-Cass | |
| Mirror Coatings | Radiant Aluminum Quartz (RAQ)? coatings with 94% reflectivity | |
| Lens Coatings | Fully Multi-Coated | |
| Glass Type | BK7/Borosilicate | |
| Primary Aperture (mm) | 90 | |
| F/Ratio | 13.9 | |
| Focal Length (mm) | 1250 | |
| Secondary Diameter | 29mm | |
| Secondary Obstruction (by diameter) | 32% | |
| Secondary Obstruction by Area | 10% | |
| Observational Info | ||
| Dawes Limit | 1.29 | |
| Rayleigh Limit | 1.55 | |
| Limiting Mag. | 12.3 | |
| Minimum Magnification | 13 | |
| Maximum Magnification | 177 | |
| Light Gathering (compared to next size down) | 27% | |
| General Info | ||
| Focuser | Primary Mirror | |
| OTA Length (Retract/Ext.) | 11" | |
| OTA Outer Diameter | 4.125" | |
| OTA Weight (with accessories) | 3.6 | |
| Accessories | ||
| Included Finder | Red Dot | |
| Included Diagonal | 1.25" Star Diagonal | |
| Mounting Accessories | 1/4-20" Foot | |
| Included Eyepieces | 25/10 Wide Angle | |
| Magnification w/ Included Eyepieces | 50x/125x | |
| Included Case | Yes | |
| Corrector | No | |
