Home > Zygo Tested Refractors
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Model: 10233Brand: SkywatcherDesign: RefractorSize: 4.75" (120mm)
Delivery: Courier Delivery
Availability:
Generally In Stock, Please Confirm Before Ordering
We are proud to introduce the new Sky-Watcher Professional ESPRIT 3-Element ED apochromatic refractors. These are instruments of the highest quality with optical performance rivalling or exceeding similar telescopes of even the most famous high-end telescope brands.
The ESPRIT Super Apo Triplets are designed for the most demanding astro-imagers but are also fine telescopes for visual observations. The premium, superbly-corrected optical systems deliver high-contrast images full of detail and zero detectable colour fringing, even on the brightest of objects.
An in house Zygo interferometer test & report is available with this telescope. Click here to read about the interferometer test in more detail. There are various packages available on this model. Please select from the packages above. The optical test and enhance includes a full inspection of the telescope, including optics, focuser, paintwork and other mechanical parts. A precise optical check is then performed then the scope is enhanced to ensure you get the best possible optical performance from your new instrument.
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. We will aim to provide 0.95 Strehl or higher.
MAIN FEATURES:
3-Element Objective Lens, Focal Length 840mm (one Ohara FPL-53 and 2 x Schott lenses)3” CNC Machined 11:1 Rotatable Dual-Speed Linear Power FocuserFull-frame Corrected Focal PlaneZero detectable Colour Fringing even on Bright ObjectsMetallic High-Transmission Lens CoatingsKnife-edge Baffled Optical SystemHigh-precision Mechanical ComponentsAluminium OTA material (superior to plain carbon-fibre for this application)Retractable Dew ShieldOTA Weight 9.61kg (without accessories), 12.13kg (with accessories)
3” DUAL-SPEED LINEAR POWER FOCUSER
3” LPF with 2” and 1.25” eyepiece adaptors and indexed scaleZero focus-shift during focusingHigh Load Capacity - holds up to 5kg of accessories whilst focusing and up to 10kg when locked.New drawtube with steel sheet held by four large bearings makes focusing smoother than everThe smooth focus motion and 11:1 fine focus wheel allows precision adjustment and critical focusing of eyepieces & camerasPatent-pending design
ACCESSORIES SUPPLIED:
2” Dielectric Star Diagonal, 28mm 2” LET Eyepiece, 9x50 Right-Angled Erect Image Finderscope, Tube Rings and Dovetail Mounting Bar
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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.
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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.
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Rother Valley Optics
01909774369sales@rothervalleyoptics.co.uk
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