Shop by Price
Shop by Brand

Celestron Inspire 90AZ Short Tube Refractor Telescope

Celestron Inspire 90AZ Short Tube Refractor Telescope
  Zoom
Celestron Inspire 90AZ Short Tube Refractor TelescopeCelestron Inspire 90AZ Short Tube Refractor TelescopeCelestron Inspire 90AZ Short Tube Refractor Telescope
Price  £199.00
List Price  £279.00
Saving Of  £80.00
(Inc. 20% VAT)
+
Add Accessory Bundle (Moon Filter, Planisphere & Smartphone Holder)

Model:  22407
Brand:  Celestron

Availability  

  

Generally In Stock, Please Confirm Before Ordering

       
2 Year Warranty On All New Items
(Excluding Batteries & Globes)




The Inspire 90 is a short refractor telescope perfect for terrestrial and celestial viewing on the go. The Inspire can view the planets, moon, star clusters and brighter deep sky objects like the Orion Nebula and Andromeda Galaxy at night and with the erect image star diagonal makes the optical tube ideal for using as a spotting scope during the day.

Setting up the telescope is a breeze and will have you observing in no time. Even on your first time out, you can assemble the telescope and its accessories in just a few minutes. The adjustable tripod legs allow you to customize the telescope’s height or place it on raised surfaces like a picnic table. The total telescope kit is lightweight and perfect for impromptu observing sessions or transporting wherever life’s adventures take you.

Manual Alt-Azimuth telescope

Navigate the sky with a panning handle Alt-Az control with clutch for smooth and accurate pointing. Move the clutch in an up/down, left/right fashion to track your object in the eyepiece.

Accessories Included

The Inspire 90 comes with two eyepieces (20mm and 10mm), a 90° erect image diagonal, an integrated smartphone adapter, a finderscope, and a red LED flashlight. The two eyepieces offer different magnifications to view your intended object. The erect image diagonal allows for right-side-up viewing ideal for terrestrial subjects but can also be used for celestial objects. The Star Pointer finderscope will help you quickly center an object in your eyepiece for easier observing. Illuminate your accessory tray with the built-in red LED flashlight. The flashlight can easily be removed from the mount to provide red light where you need it most.

Smartphone Adapter – Image celestial or terrestrial objects with this smartphone adapter! With its light, rigid frame, this accessory allows you to connect any smartphone to any telescope eyepiece with an outside diameter of 45mm or smaller. The additional magnification provided by the eyepiece allows your phone to capture great images of the Moon, planets, and terrestrial targets like birds and wildlife. This smartphone adapter installs easily by clamping over the top of an eyepiece. The smartphone is held in position with the help of bungee cords that securely lock your phone in place. While the vast majority of smartphones can be used with the case on, some very large and/or bulky phone cases (such as folio style cases) may need to be removed for the phone to fit in the adapter.

Starry Night Software

Download Celestron’s Starry Night Software and learn about the night sky, celestial objects, and how to plan your next observing session. Celestron Starry Night Software is the premier astronomy software package on the market, providing resources and knowledge to view our solar system and beyond.

OPTICAL TUBE INFO:
Optical Design Refractor
Aperture 90mm (3.54")
Focal Length 660mm (26")
Focal Ratio f/7.3
Focal Length of Eyepiece 1 20mm (.78")
Magnification of Eyepiece 1 33x
Focal Length of Eyepiece 2 10mm (.4")
Magnification of Eyepiece 2 66x
Finderscope StarPointer Pro
Star Diagonal Erect image 90° (1.25")
Optical Tube Aluminum
Highest Useful Magnification 213x
Lowest Useful Magnification 13x
Limiting Stellar Magnitude 12.3
Resolution (Rayleigh) 1.55 arc seconds
Resolution (Dawes) 1.29 arc seconds
Light Gathering Power (Compared to human eye) 165x
Optical Coatings Fully coated glass optics
Optical Tube Length TBD
Optical Tube Diameter TBD
Optical Tube Weight TBD
Dovetail Vixen/CG-5 Dovetail bar
MOUNT INFO:
Mount Type Manual Alt-Azimuth
Height adjustment range (includes mount and tripod) 1193.8mm (47") max height
Tripod Leg Diameter 31.75mm (1.25") Stainless Steel
Accessory Tray Yes
Tripod Weight TBD
Slew Speeds Manual
Dovetail Compatibility Vixen/CG-5 saddle plate
Software Celestron's Starry Night Basic Edition Software, SkyPortal App
Total Kit Weight TBD
Included Items Optical tube | Mount and tripod | Accessory tray | Two eyepieces (20mm and 10mm) | 90° erect image diagonal |Integrated smartphone adapter | Finderscope | Red LED flashlight

Be the first to Write a Review for this item!

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.

 


Related Products
Celestron Inspire 100AZ Refractor Telescope

Celestron Inspire 100AZ Refractor Telescope£299.00   £275.00

The ultimate telescope for the novice to intermediate astronomer, the Inspire 100AZ features the largest aperture in the Inspire family line and its short tube offers a wider field of view perfectly suited for larger, fainter deep sky objects.

Celestron Inspire 70AZ Refractor Telescope

Celestron Inspire 70AZ Refractor Telescope£199.00   £158.00

*Free Delivery*

*Special offer while stock lasts *

The lightest telescope in the Inspire series! The Inspire 70AZ is the ultimate telescope for the novice to intermediate astronomer, offers easier transport and storage, and is packed with features never seen before on entry level telescopes.

Celestron Inspire 80AZ Refractor Telescope

Celestron Inspire 80AZ Refractor Telescope£279.00   £165.00

*Special offer while stock lasts *

The ultimate telescope for the novice to intermediate planetary astronomer! The Inspire 80AZ offers the longest focal length in the Inspire line for higher power views of the planets and is packed with features never seen before on entry level telescopes.

 

 

 

Rother Valley Optics Ltd
Rother Valley Optics Ltd