Manufacturer: Orion UK
Product number: ORODK10

EUR 5.397,00


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Orion Optics UK ODK10 - 10" F/6.8 Optimised Dall-Kirkham - Flat Field
The introductory model for the ODK range is the 250 mm model, the ODK10. As with all the ODK models, the ODK10 is fitted as standard with an ACU-3S, 3” focuser to enable a strong focusing platform for a wide range of cameras. Being both a photographic and visual telescope, you are assured of some spectacular views of the planets, the Moon and even faint nebulas and galaxies.

The field size is usable to over 50 mm, ensuring you have the choice of some higher power imaging and views on axis for the planets and moon etc., but also the capability to present to your camera some amazing fields of deep-sky objects, particularly those requiring a higher degree of magnification.

ODK Optimised Dall-Kirkhams from Orion Optics UK
The full range is based on a focal ratio of f6.8, fast enough for some superb photo-visual deep-sky use and still have enough focal length for high resolution planetary work both visual and CCD applications.

The tube is constructed from carbon fibre sandwich design. Very, very strong to avoid flexing and zero expansion to ensure the focal plane does not change over long photographic exposures. Being an open tube design and very short, cool down times are remarkably fast.

To assist cool down of the telescope, each model is fitted with three fans, all positioned behind the primary mirror.

Exact focusing across the ODK range is achieved with Orion´s Precision ACU-3S 3” Crayford Focuser featuring a 10:1 reduction drive included as standard - focuser shown as fifth image. Good images need good optics, all fitted in reliable, stable and precise engineering.

Optics
All Orion UK ODK primary mirrors are made from Schott Borosilicate Low Expansion Suprax glass (virtually identical to Pyrex), as are all Orion primary mirrors on all ranges of telescopes. The mirrors are all produced to exacting standards to an F4 paraboloid configuration. How exact are they? Well, the specialists don’t release one to their coating department unless it achieves a surface accuracy of 1/6 wave or better. How do they know when they have achieved that very high degree of accuracy? They use one of the worlds most exacting measuring devices, a Zygo Laser Interferometer. Take a few minutes and visit the Zygo page and be amazed at just how good this machine is at measuring optics, it can measure optical distances which are smaller than 2,000, yes, 2,000 times smaller than the thickness of a human hair.

Without a Zygo or similarly accurate and reliable measuring instrument, it is impossible to know the optics’ or telescope’s performance exactly. Only the best manufacturers in the business of making telescopes use them because they are not suitable for mass produced telescopes, they are slow to use and need highly skilled technicians to operate them, it just does not lend itself to anything other than the highest quality, hand figured optics, definitely not mass produced optics to a tight budget.

Primary mirrors are Hilux coated for the highest possible aluminium protected reflective surfaces available.

Tube Rings
To give maximum security and exactness, Orion Optics manufacture, on their own CNC milling machines, aluminium tube rings which are machined from solid pieces of aluminium and later black anodised to protect the surface which are felt lined to give a gentle but firm grip to the polished tubes. Pressure adjustment is made by the large knurled knob on each tube ring to give precise amounts of friction on the tube outer surface.

ACU-3S Focuser
The ODK series of Optimised Dall-Kirkhams is supported by a precision 3” focuser of short draw tube length. The top of the draw tube is threaded to accept many accessories, adaptors and spacing components. Silky smooth, incredible strength and attractive looks give you all the reliability and confidence in the ACU-3S you are ever likely to need. 3” draw tube (76.2 mm) enables wide fields to be achieved with vignetting not being a problem. Ultra accurate 10:1 slow motion control with a smooth, effortless motion which has got to be tried to be believed. Carrying capacity way beyond the requirements of all but the heaviest cameras.

The focuser is connected the telescope by means of a very accurate machined female dovetail which is held onto a male equivalent on the telescope tube or cell with stainless steel grub screws. The beauty of this arrangement is that these screws and dovetail coupling allow you to rotate the focuser through 360 degrees rotation. In other words, to put it in exactly the rotational position you want for the attached equipment fitted, CCD, filter wheels, guiders etc. It just makes it so easy to set things up perfectly to meet your needs.

Astrophotographic results obtained with this telescope on Astrobin
Here you can find some astrophotographs made with this telescope model: Link to Astrobin
Primary mirror diameter:250 mm
Focal length:1700 mm
Focal Ratio:f/6.8
Tube Weight (inc. mount plate/dovetail):12 kg
Tube Diameter:300 mm
Tube Length:475 mm
BFD (Back Focal Distance) from cell face:213 mm
Tube Material:Carbon fibre sandwich
Secondary Size:96 mm
Mirror Cell:Honeycombe CNC machined alum. cell
Focuser:3" Crayford with 10 to 1 reduction
Eyepiece side connector:Male thread M82x1
Adaptor from M82x1:To 2" and to 1.25" push fit
Corrector Design:Multi coated 3 lens
Flat Field Size:50 mm
Spot Size on Axis:3.5 µm
Spot Size at Field Edge:6.2 µm
Mirror / Tube Cooling:3 Controllable fans
Attachment Method:CNC machined alum. dovetail with supports
Optical tube assembly with focuser and fans
Tube rings
Dovetail bars
Adapter M82x1 to 2"
Adapter M82x1 to 1.25"
Cable for fans
Ronchi eyepiece

Astrophotographic results obtained with this telescope on Astrobin
Here you can find some astrophotographs made with this telescope model: Link to Astrobin

The surfaces of mirrors - Information from Orion UK
Manufacturing precision optical surfaces, (in this category we include both mirrors and corrector lenses), involves many specialised procedures to achieve the high degree of optical precision, some of which occasionally leave surface blemishes on the optic (mirror and/or lens).

If there are a few sleeks or scratches on the optics’ surface they in no way effect the performance of the lens or mirror either visually or photographically and cannot be considered as an acceptable reason for any complaint. Small pits are occasionally visible due to processing in the polishing and figuring process, these again cannot be accepted as reason for complaint. We endeavour to have blemish free surfaces but cannot guarantee such. Accordingly, we have set our cosmetic surface finish at a high standard production tolerance as is practical. We apply an optics industry standard to our surfaces of 80/50 scratch dig which is a measure of an acceptable level of surface blemishes per optic is acceptable.


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