Ex Display Moonlite CHL EdgeHD 11" & 14" Large Format Dual Speed Crayford Focuser In Black

Please note this listing is for the Moonlite 2" CHL EdgeHD 11" - 14" model in black with dual rate shaft lock and it comes with the low profile mirror lock and focus knob replacements as per the image. This listing is for a manual focuser.  This is an ex display focuser but it's not been mounted or used. The item condition is A1 new. 

The new CHL 2.5” large format focuser features a low profile hybrid design to allow focal reducers to be used inside the focuser. N

We make 3 versions: one for EDGE 8” using the .7” EDGE reducer; one for EDGE 9.25” using the Lepus Telecompressor #19410; and for the EDGE 11” / 14” using the large EDGE .7 Celestron brand reducer. All CHL focusers will work with out the reducer installed as well.

CHL focusers for EDGE 8" and 9.25" scopes include a special short profile replacement knob kit. The machined aluminum knobs replace the stock plastic mirror lock and focus knobs. The knob design along with a tapered bottom focuser flange shape allows the CHL 2.5” large format focusers to thread on to the visual back in a very low position. This super low profile along with the reducers fitting up in the large format focuser’s drawtube provide much needed back focus for imaging set ups. We also include a special 68mm to Recessed T-thread adapter along with the normal 2” and 1 ¼” comp ring thread in tops. All 3 thread in tops come standard with any of these CHL model focusers.

CHL focuser for EDGE 11"/14"inch scope includes:

3 ¼” threaded flange Fits both the 11" and 14" EDGE OTAs, with or with out a reducer installed in front of the focuser.
Special 68mm to- recessed T-thread with lock ring adapter included free.
No Knob kit is needed with the 11" and 14" EDGE scopes as the stock knobs are away from the focuser and do not pose any limitations.

The CHL focuser for the 11”/ 14” EDGE scope can use the Large EDGE .7 reducer. The reducer needs threaded on to the visual back first, then the focuser threads on to the reducer. The 146mm back focus specs allows enough room for both the focuser and camera in most configurations. However adding an OAG may place the spacing to far out. Note the Lepus reducer at 101mm spacing does not work with the CHL EDGE focuser on the 11/14", Please use the correct .7 EDGE reducer from Celestron that provides the 146mm back focus space.

Standard -The standard CHL comes with our heavy-duty 1.5" Tri-knob option. It is a dual rate (2 speed) configuration using our extremely smooth 8 to 1 reduction unit. It uses large 1.5" OD knobs and has both a coarse and a fine knob on one side and a coarse on the other. The larger tri-knob option is a heavy-duty version of the regular dual rate system found on our smaller CS focusers and has increased lifting capacity to 6 lbs. The fine focus adjustment knob is on the right by default, but can be made a lefty if needed.
Tri-knob w/Lock ($25) - The Tri-knob with LOCK knob option adds the shaft lock system to the coarse side. The shaft lock option uses a unique mini brass compression ring clamp sub system that allows the user to lock the shaft with out deflecting the drawtube. This type of focus lock is much better then the old "thumb screw against the draw tube" style that would shift the image when pressed against the draw tube. The shaft lock ability along with the 6 lb heavy-duty reduction unit make this option ideal for heavy demanding loads for both visual and imaging requirements.
DC Motor ($195.00) – The DC motor with slip clutch option uses our Dual channel battery operated hand controller. It allows adjustable speed control for focus on the first channel, and the 2nd channel is available for running a 2nd focuser, or our rotating flange option. The Slip clutch feature on the motor allows both manual operation using the knobs and electronic hand controller operation at the same time. The DC gear head motor and controller combination are ideal for operation of the focuser when a Computer is not going to be used. The DC motor is ideal for visual or imaging and provides a 8 lb lifting capacity when installed on the focuser.

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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