Celestron Nexstar 130 SLT Telescope

Affordable entry to mid level computerized GOTO telescope

This Scope comes with the following items.
The Sky Level 1 planetarium software and NSOL Telescope Software.
Red dot finderscope
25mm Eyepiece
9mm Eyepiece

Designed to be an affordable entry level to mid-level computerized GoTo telescope, the NexStar Star Locating Telescope (SLT) refractors and reflectors are available in the most popular sizes and are loaded with valuable design features. With pre-assembled, adjustable stainless steel tripods, and quick release fork arms and tubes, NexStar SLT telescopes can be set up in a matter of minutes — with no tools required! You can see details of the lunar surface, Venus and its phases, Mars resolved as an orange disc, Jupiter and its four moons, Saturn with its rings plainly visible and much more!

Intelligent Design

Powered by 8 AA user supplied batteries or an optional AC adapter (#18773) these NexStar GoTo`s love to travel. The internal battery compartment provides power to the high precision servo motors for rigid low-vibration performance while eliminating cord wrap issues associated with external battery packs. With the NexStar`s ergonomically-designed hand control, the user is free to remove the hand control from its holder for remote use or leave it cradled for hands-free operation. With a touch of a button you can select the object catalog, change the slew speed, view fascinating information about an object, or simply know if a desired object is visible in the sky.

Celestron`s Revolutionary SkyAlign

Using Celestron`s patented SkyAlign* (patent pending), simply input the date, time and location into the hand control then slew the telescope to any three bright celestial objects in the sky. You do not need to know the names of the stars — you could even pick the moon or bright planets!

To assist in the star alignment, the NexStar uses a lightweight StarPointer Finderscope. The StarPointer is the quickest and easiest way to point your telescope exactly to the desired object in the sky. It`s like having a laser pointer that you can shine directly onto the night sky. No need to worry about the inverted images you see through traditional finders, just align the red dot seen through the StarPointer with the desired star in the sky. It`s that easy.

The popularity of our NexStar 114 models inspired us to go bigger! We are proud to introduce NexStar 130 SLT. The NexStar 130 SLT has 30% more light-gathering power than our 114mm telescope. And the 114 SLT, like the other models in the SLT Series, comes with a fully computerized hand control. The computerized hand control gives you the ability to automatically slew to any of its 4,000+ objects, including over 600 galaxies, 300 clusters and dozens of beautiful binary stars. With its pre-assembled, adjustable steel tripod, the NexStar 114 SLT can be up and ready to use in a matter of minutes. Our new SkyAlign alignment technology and the included StarPointer Finderscope with a red LED makes aligning a breeze.

View the details of the lunar surface, the rings of Saturn, the polar ice caps on Mars, the cloud belts on Jupiter or a number of the Messier objects such as the globular cluster in Hercules (M13), or the Great Nebula in Orion (M42). Begin to explore some of the fainter Messier objects using the additional light-gathering capabilities of the 130 SLT`s 5" primary mirror. Because of the Newtonian design, the mirror gives fully color-corrected views that are best suited for astronomical use.

Optical Design Newtonian Reflector
Aperture (mm) 130 mm (5.12 in)
Focal Length (mm) 650 mm (26 in)
Focal Ratio 5
Eyepiece 1 (mm) 25 mm (0.98 in)
Magnification 1 26 x
Eyepiece 2 (mm) 9 mm (0.35 in)
Magnification 2 72 x
Finderscope StarPointer
Mount Motorized Altazimuth
Accessory Tray No Tool, Quick release CD ROM The SkyX First Light Edition astronomy software and NexStar Observers List (v2.6.4c) Tripod Steel
Weight (lbs) 18 lbs (8.16 kg)
Highest Useful Magnification 307 x
Lowest Useful Magnification 19 x
Limiting Stellar Magnitude 13.1
Resolution (Rayleigh) 1.07 arc seconds
Resolution (Dawes) 0.89 arc seconds
Photographic Resolution 400 line/mm
Light Gathering Power 345 x
Angular Field of View (deg) 1.7 °
Linear Field of View (@1000 yds) 91 ft (28 m)
Secondary Mirror Obstruction 1.7 in (43 mm)
Secondary Mirror Obstruction by Diameter 33 %
Secondary Mirror Obstruction by Area 11 %
Optical Coatings Aluminum
Slew Speeds Nine slew speeds: 4°/sec, 2°/sec, 1°/sec, .5°/sec, 32x, 16x, 8x, 4x, 2x
Tracking Rates Sidereal, Solar and Lunar
Tracking Modes Alt-Az, EQ North and EQ South Alignment Procedures SkyAlign, Auto 2-Star Align, 1-Star Align, 2-Star Align, Solar System Align
Computer Hand Control Fully Computerized / Flash Upgradeable
GPS Optional SkySync GPS Accessory (93969)

Please note that stock levels do fluctuate so please call or email to check today's stock before placing your order.

Some items that are showing as in stock are in stock at our holding warehouses, not at the shop. To double check the stock levels at the shop, please contact us on 01909774369 or sales@rothervalleyoptics.co.uk.

The delivery times for most items is 1 - 2 days but again, please double check stock levels on important orders before placing an order via the website.

The delivery costs for courier next day are for mainland UK only. If you live in the Scottish Highlands/Islands, Channel Islands or Northern Ireland, then a shipping surchage will apply. please contact us for prices. Smaller items can still go 1st class via Royal Mail.

Please note that if you are wanting to take advantage of our Saturday and Sunday timed services or next day pre 12 or pre 10:30 services, you MUST check that the stock is here at the shop before placing orders. Also, orders using the Saturday and Sunday services must be placed before 1pm the previous working day. Also, please remember to check that the stock is here at the shop before placing orders. If the stock is not at the shop, we won't be able to ship on any of the timed services. 

Please note International customers will need to contact us for a shipping price prior to ordering via the website. We don't ship all items internationally. It is at our discretion what we ship outside of the UK. This all depends on the size and weight of the items. Please get in touch with us for any postage costs. Please note we do NOT ship telescopes or heavy items outside of the UK. This is due to massive postage costs and problems regarding returns.

If you have any questions regarding stock levels or delivery, please get in touch.

Zygo Interferometer Testing For ED Refractor Telescopes!

We are extremely pleased to announce our Zygo Interferometer is now installed and ready for use! Our experienced staff can test refractor lenses up to 120mm aperture and provide a comprehensive 2 page report showing the optical quality and Strehl ratio, plus much more information. We are using the very latest Zygo MX software to provide a more detailed report compared to other standard reports.

The interferometer is essentially a measuring instrument. Within the interferometer is a calibrated laser that is pointed through the optical test surface, then onto a high quality reference sphere, then back through the test subject then to an internal camera which gives us the measurement on the screen. From this, we can adjust the position of the test optic and the reference sphere to obtain a perfectly calibrated system. The more central the laser to the test optic and then on return, the better and more accurate reading and measurement we can take. This takes a lot of adjustment to get the best results from the optical surface. Once the measurement has been taken, we are provided with a series of results that show the optical quality of the surface plus other information. Continue reading for an explanation of the individual values and you can also see a test report that was done on one of our RVO Horizon 60 OTAs. 

We are offering certain telescopes with a Zygo test at an extra cost. Mainly ED doublets and triplets. All available telescopes with a Zygo test report are listed here. Just select Zygo Test Report from the drop down box at the top of the listing and we will test the optics in house and provide a full 2 page report with your scope. This will show you the optical quality of your telescope optics. We can also offer this service on your refractor telescope. Please get in touch for more details about this. 

At Rother Valley Optics, one thing we pride ourselves on is customer service and quality of our equipment. When we test your telescope, we will ensure that it is of the highest quality otherwise, we will reject the scope under our strict quality control and test another model for your peace of mind. One of the main values to look at when testing a refractor is the Strehl ratio. The higher this number, the higher quality lens you have. At Rother Valley Optics, we will guarantee the highest possible Strehl ratio for your telescope.  We will aim to provide 0.95 Strehl or higher on Takahashi, RVO Horizon, William Optics and many more! Generally, the higher the Strehl ratio, the lower the Astigmatism and Coma meaning a better image quality from your instrument. 

Other measurements such as the PV and RMS are important too. With these measurements, the lower the number the better as it shows less curvature on the lens. The flatter an optical lens, the better it will perform. The PV rating (Peak To Valley) is a measurement from the highest point (Peak) to the lowest point (Valley). From this we get the RMS (Root, Mean, Square). This is a similar figure to the PV and measured exactly the same way. The RMS is basically an average height difference from the PV so again, the lower the better. As you can see form the example below, we measured an RMS of just 0.027 wave which is a very good value.

We also measure the Power with our systems which is essentially the error from the reference sphere to the test optic. The reference sphere we use on our system is a very high quality sphere so the closer to zero the Power, the less error between the 2 elements thus ensuring a higher quality optical surface. 

You will also see some more values such as Astigmatism and Coma. Again, these are measured by the interferometer when we take measurements of the optical surface after adjustment. These are values which ideally would be at 0 but as our test optics are all curved lenses, there will always be astigmatism and coma present. The lower the number, the less of these aberations you will effectively see but with most refractors, you can buy field flatteners which will compensate for the coma anyway. The astigmatisms value is explaining the error between the symmetrical curvature of the lens. Basically, no lens will be perfectly symmetrical, the lower the astigmatism, the more symmetrical the lens surface is. 

Once the Zygo test report has been completed, the optical alignment is thoroughly tested and tuned to ensure they are spot on before they leave us. 

All available telescopes are on the website at the link below and ones we've tested already that are available straight away are also listed.

https://www.rothervalleyoptics.co.uk/zygo-tested-refractors.html

Here is an example of the test what we provide. This was a test on one of our Horizon 60 ED OTA's.

For any questions about this amazing new service, please either call 01909774369 or email sales@rothervalleyoptics.co.uk.

Are you interested in this product but would like to speak to someone with some more information? Simply fill in the form below and we will get back to you as soon as we can!

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