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Takahashi FS-60CB F/5.9 Doublet Fluorite APO Refractor OTA With Zygo Interferometer Test Report

Takahashi FS-60CB F/5.9 Doublet Fluorite APO Refractor OTA With Zygo Interferometer Test Report
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Price:  £825.00(Inc. 20% VAT)Earn 825 Loyalty Points
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Model:  TSK06210ZYGO
Brand:  Takahashi

Availability:  

  

Generally In Stock, Please Confirm Before Ordering



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


This package is the FS-60CB OTA only. No accessories are included. 


A Zygo Interferometer test and report is included with this telescope. The test will show the optical quality of your lens and provide a comprehensive 2 page report showing the PV, RMS, Strehl ratio and much more information about your telescope! This will show you exactly the condition and quality of the lens. Please click the Zygo Test Report tab above for full details and a more in depth explanation about the Zygo Test Report!

The Takahashi FS-60CB apochromatic refractor features exceptional optical and mechanichal qualities (objective with Fluorite doublet) and an incredible compact design. All Takahashi is in it.

It's great versatility will charm all the observers. It can easily be used for the visual observation, as well as astronomical or terrestrial. For the photographers, it is transformed into wide field astrograph or guiding scope.

Apochromatic objective with Fluorite doublet
Its first quality comes from its apochromatic objective with Fluorite doublet of 60mm of aperture, as good as refractors with higher diameter. The FS-60 will astonish more than one purist. When one knows what one can obtain from an excellent short focal length optic (F=355mm, F/D 5,9) in imaging, we immediately understand all the advantage of this small compact and transportable telescope.

Exceptional mechanics
Excellent Takahashi mechanics propels the FS-60CB at the top of the refractors of this category. Its tighted rack-and-pinion focuser is designed for astrophotography and CCD imaging. A thumb screw maintains the focuser in position whatever the direction of pointing is.

Versatility and performances
Light and compact, the FS-60CB can be easily change into planetary telescope or wide field CCD imager or auxiliary instrument for guiding, and this, thanks to a vast range of accessories.

Takahashi FS-60CB refractor

CHARACTERISTICS TAKAHASHI FS-60CB REFRACTOR
Objective Fluorite doublet apochromat
Lens cell Air-spaced doublet. Fluorite on the front
Coatings Hard multicoatings
Diameter 60 mm
AT PRIME FOCUS
Focal length 355 mm
Focal ratio F/5.9
Metal Back Distance 162 mm
WITH FL-FS-60C FIELD CORRECTOR
Focal length 370 mm
OFocal ratio F/6.2
Image circle diameter 45 mm
Metal Back Distance 56.2 mm
WITH FC/FS MFL1.04X FIELD CORRECTOR
Focal length 370 mm
Focal ratio F/6.2
Image circle diameter 45 mm
Metal Back Distance 56.2 mm
WITH RD-C0.72X FOCAL REDUCER
Focal length 255 mm
Focal ratio F/4.2
Image circle diameter 40 mm
Metal Back Distance 56.2 mm
WITH 1.7XR FOCAL EXTENDER (FS-60Q)
Focal length 600 mm
Focal ratio F/10
Metal Back Distance 158.4 mm

Takahashi FS-60CB refractor

CHARACTERISTICS TAKAHASHI FS-60CB REFRACTOR
Length of the optical tube 440 mm
Diameter of the optical tube 80 mm
Diameter of the dew shield 80 mm
Weight 1.4 kg
Focuser

Rack-and-pinion

 

 

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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.

Rother Valley Optics now have a loyalty point scheme active on the website. As you can see from the products, every item has a point value. Each pound you spend with us, you will receive 1 loyalty point. 1 point is worth 1p. You can accumulate these points as you shop with us, then when you are over £5, you can spend them on the website! Easy as that.

Even if you collect most of your items from our shop, you can still order via the website and select the "shop collection" delivery option. Then you can come to our shop, collect your item and still get your points!

Please note this scheme is online only. Customers who order via the telephone can still be added to the scheme manually. Please ask for more details on this. Before placing orders online, please make sure you are registered with us first otherwise your points won't be allocated.

So happy shopping and if you have any questions about the scheme or any other queries, please get in touch.

Rother Valley Optics

01909774369
sales@rothervalleyoptics.co.uk

Finance is now available on most products above £250! We offer 12, 24, 36 and 48 months with a fixed 15.9% typical APR. Please note this can't be done through the website at this moment in time. You will need to email us or drop into the shop to sort out finance. As long as the item is above £250, finance is generally available!

Please note some items are NOT eligible for finance. Please contact us for eligibility first. 

Please get in touch with us today to find out if you're applicable.

You must be over 18 years to apply, live in the UK, have a valid UK bank account and not be bankrupt. Your credit file will be searched on application to see if you are eligible.

Rother Valley Optics Ltd is registered in England and Wales 04762707. Registered Office: 21 Station Road, Kiveton Park, Rotherham, S26 6QP. Rother Valley Optics Ltd acts as a credit broker only. Rother Valley Optics Ltd are authorised and regulated by the Financial Conducts Authority. Credit provided subject to age and status..

If you have any questions about this, simply give us a ring or drop into the shop for a chat.

- - - Rother Valley Optics Ltd

01909 774 369
sales@rothervalleyoptics.co.uk

We are extremely pleased to announce our Zygo Interferometer is now installed and ready for use! Staff training has been completed so we can now test refractor lenses 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.