Celestron - 9.25" EdgeHD (Optical Tube)
Celestron - 9.25" EdgeHD (Optical Tube)
Celestron - 9.25" EdgeHD (Optical Tube)
Celestron - 9.25" EdgeHD (Optical Tube)
Celestron - 9.25" EdgeHD (Optical Tube)

Celestron - 9.25" EdgeHD (Optical Tube)

822210X

Regular price€3.341,69
/
incl. VAT

  • Express delivery within the EU
  • Item Available, ready to ship
  • Item Available, shipping soon

The EdgeHD optics (Edge High Definition) combine the compact design of a Schmidt-Cassegrain with significantly improved imaging at the edge of the image. This optical system not only offers the properties of astrographs, but also produces completely undistorted, sharp images right up to the edge of the large visual and photographic field of view.

Not only is the coma outside the optical axis corrected - as with other "coma-free" optical designs available on the market - but also the field curvature!

Many optical systems are promoted as "astrographs"; however, they produce the coveted "pinpoint" star image along a curved image plane. On images taken with modern CCD cameras, the result is a noticeable field curvature that increases towards the edge of the image field and becomes stronger the larger the chip is; i.e. the stars remain round, but are blown up into small rings ("donuts") towards the edge.

With the Celestron Edge HD telescopes, this field curvature is corrected right up to the edge in addition to the coma, so that even images taken with large CCD chips are completely sharp, with a uniformly large star image across the entire chip - right into the corners of the image field.

This also significantly improves the resolution and limiting magnitude compared to competing optical systems with a similar aperture. The Celestron XLT multi-coating also helps the Edge HD optics to achieve a significant increase in performance compared to similar systems on the market.

The EdgeHD optics produce images three times flatter in the image field plane than a standard Schmidt-Cassegrain. The stars are imaged diffraction-limited across the entire chip of a Nikon D3 or Canon 5D !

Spec:

  • Optical design: EdgeHD
  • Optical coating: Starbright XLT (Fully multi-coated)
  • Telescope aperture: 235mm (9.25")
  • Focuser size (inches): 3.3" + 2" SC thread, 1.25"
  • Tube (material): Aluminum
  • Tube weight: 9.53kg
  • Tube length: 22 in (559mm)
  • Aperture ratio: f/10
  • Resolution (DAWES): 0.49 arcseconds
  • Resolution (RAYLEIGH): 0.59 arcseconds
  • Focal length: 2350mm (93 in)
  • Secondary mirror obstruction: 8.5cm
  • Secondary mirror obstruction relative to diameter: 36.20%
  • Secondary mirror obstruction relative to surface: 13.00%
  • Limit size: 14.4
  • Highest useful magnification: x555
  • Light gathering capacity (compared to the human eye): x1127

Whats included:

  1. Focal length eyepiece: 23mm
  2. Incl. accessories: 9.25“ EdgeHD telescope with 3“ rail (Losmandy style) 9x50 finder, 2“ star diagonal, 1.25“ adapter, 23mm Luminos wide angle eyepiece.
  3. Viewfinder: 9x50
  4. Zenith prism: 2" with 1.25" adapter
  5. Dovetail compatible: CGE (3“ Losmandy style)

 

Please Note: The estimated delivery times below are calculated from when your order is dispatched (eg. when you receive your 'Order completed' email and tracking number). If an item is a special order item (eg. its not in stock but we can order it in) then it will usually require an additional 1 - 2 days before being dispatched. 

All orders are shipped using our reputable courier partners DHL to ensure your items arrive safely and promptly. All items are fully tracked and we currently only ship within the EU.

REPUBLIC OF IRELAND


 

Est. Delivery Time:
5 - 7 Working days after dispatch

Standard Tracked Delivery:
Republic of Ireland Nationwide: from €8.95 upwards

Note: The exact shipping charge will depend on the size of your order and will be calculated at the checkout. Some large and bulky Telescopes may also be shipped to you directly from our Manufacturer. This is a special agreement we have with our suppliers to ensure our customers enjoy the cheapest possible shipping rates for large bulky Telescopes.

For some very large Telescopes over 45kg, it may require special handling instructions and you will be asked at the checkout to contact us for a special delivery quotation.


Mainland EUROPE (EU)



Est. Delivery Time:
3 - 5 Working days after dispatch

Standard Tracked Delivery:
Mainland Europe: from €4.95 upwards

Note: The exact shipping charge will depend on the size of your order and will be calculated at the checkout. Some large and bulky Telescopes may also be shipped to you directly from our Manufacturer. This is a special agreement we have with our suppliers to ensure our customers enjoy the cheapest possible shipping rates for large bulky Telescopes.

For some very large Telescopes over 45kg, it may require special handling instructions and you will be asked at the checkout to contact us for a special delivery quotation.

EU Additional Info:

If your country is not listed below please contact us for a specialised quote.

Standard EU Delivery Regions:
Germany, France, Belgium, Poland, Luxembourg, Netherlands, Denmark, Portugal, Spain, Austria, Italy, Poland, Croatia, Malta, Greece, Monaco.

 



IMPORTANT
: It is essential when placing an order, that you include a valid 'Contact Telephone Number' for the delivery address or for the person receiving the item. This is necessary to avoid potential delays, return delivery costs or problems with your delivery.

Shipping Disclaimer: All of our parcels are sent via a 3rd party registered courier service to ensure safe and prompt delivery. While we endeavor to ensure that all parcels are delivered within the specified time frame, 'Horizon Astronomy' can not be held responsible for delays due to adverse weather conditions or other courier/technical related issues outside of our control.

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