ODK14 f/6.8 Optimised Dall-Kirkham

OOUK

ODK14 f/6.8 Optimised Dall-Kirkham

Regular price
$ 9,299.00
Sale price
$ 9,299.00
Unit price
per 

This item is a Special Order from the Manufacturer

Special Order

Description

The full range is based on a focal ratio of f6.8, fast enough for some superb deep sky photo-visual 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 a Starlight Instruments FTF301B-A Feather Touch 3 Inch dual speed focuser included as standard - pictured below right. 
Good images need good optics, all fitted in reliable, stable and precise engineering.

Customers with heavier than normal (4kg+) CCD equipment can add features to the ODK tube to enhance stability.

ODK Light Path Diagram

To produce the photo-visual wide, flat field of the ODK range, we have designed and fitted integrally, a corrector lens system. which ensure both colour correction, coma and spherical aberration are optimised to achieve almost a perfect photographic and visual field. Adequate back focus allows all modern CCD cameras to be used with auxiliary equipment. Multi layer anti reflection coatings are applied to all lens surfaces to maintain brighter images.

CNC machined mono construction secondary spider and trim ensures stability in collimation. Our unique collimation adjustment system enables perfect collimation of the secondary mirror to be achieved, quickly and reliably.

All our ODK primary mirrors are made from Schott Borosilicate Low Expansion Suprax glass (virtually identical to Pyrex), as are all our 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, we don’t release one to our coating department unless it achieves a surface accuracy of 1/6 wave or better. How do we know when we have achieved that very high degree of accuracy? 
We 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 give accurate measurements of an optics’ or telescope’s performance. 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.

ODK 14

Because of the unusual demand we had initially for the ODK14 we had to take it out of our sales catalogue until we caught up with orders. We are now able to offer this amazing telescope again. Amazing in performance for planets, the moon, globular clusters, galaxies, virtually anything in the sky you can think of, the ODK14 will capture it and present you with stunning visual images and, incredible photographs. 

The excellent Starlight Instruments FTF301B-A 3 inch dual speed focuser (pictured below) is available as an add on to enable a strong focusing platform for a wide range of cameras.

Mid way between the compact and very portable ODK12 and the heavier, ODK16, usually the ODK14 is observatory based. Still manageable by one person yet enough light grasp to carry out serious imaging and research on some of the more elusive objects on offer in the sky.

This is a serious telescope and you will be more than pleased you chose one the first time you point it to the night sky.

Specifications

Specification

ODK14

Primary mirror diameter

350mm

Focal length

2380mm

Focal Ratio

f6.8

Tube Weight (inc. 
mount plate/dovetail)

26kg

Tube Diameter

400mm

Tube Length

700mm

BFD (Back Focal 
Distance) from cell face*

210mm

Tube Material

Carbon fibre sandwich

Secondary Size

136mm

Mirror Cell

Honeycombe CNC
machined alum. cell

Focuser

3" Add on Option

Corrector Design

Multi coated 3 lens

Flat Field Size

>52mm

Spot Size on Axis

2.1 microns

Spot Size at Field Edge

5.6 microns

Mirror / Tube Cooling

3 Controllable fans.
Heaters optional

Attachment Method

CNC machined alum.
dovetail with supports

Note: All USA AG 'scopes are supplied with adapters to connect to Starlight Instruments focusers. Focusers are NOT supplied with the telescope but are available as an 'add on'. Images used are for aesthetic appearance only.

Optional Dew Shield available - this is a matching, lightweight carbon fibre addition to help curb the onset of condensation in damp prone atmospheric climes. It is fitted or removed literally in less than a minute and greatly reduces the heavy dew precipitation which can so easily ruin what could be a classic imaging session.

 

Personal Upgrade Path

Buy risk-free: When it’s time to trade up you’ll get the most value for your used gear.