PlaneWave CDK20 ASTROGRAPH F/6.8 WITH FUSED SILICA OPTICS

PlaneWave CDK20 ASTROGRAPH F/6.8 WITH FUSED SILICA OPTICS

PlaneWave CDK20 ASTROGRAPH F/6.8 WITH FUSED SILICA OPTICS

PLANEWAVE

The 20" CDK is a revolutionary new telescope optical system that is designed to excel at imaging on large format CCD cameras while remaining an excellent instrument for visual use.

Διαθέσιμο με Προπαραγγελία

Διαθέσιμο με Προπαραγγελία

Στην περίπτωση αυτή περιλαμβάνονται προϊόντα που συνήθως δεν κρατάμε σε στοκ και για κάποιους λόγους -που δεν εξαρτώνται από την εταιρία μας- δεν μπορούν να είναι διαθέσιμα σε διάστημα μικρότερο των 14 ημερών.Στην κατηγορία αυτή περιλαμβάνονται και προϊόντα που προδιαφημίζονται από τους κατασκευαστές αλλά δεν άρχισε ακόμη η επίσημη διανομή τους στην ελληνική αγορά. Πιθανόν για τα είδη αυτά να παρέχεται δυνατότητα προπαραγγελίας με ειδική προνομιακή τιμή. Αν γνωρίζουμε ήδη την πιθανή ημερομηνία άφιξης του συγκεκριμένου προϊόντος, στις αποθήκες μας, τότε αυτή θα αναγράφεται ξεχωριστά και επάνω από την ένδειξη «Διαθέσιμο με Προπαραγγελία»

Διαθεσιμότητα: Σε απόθεμα
SKU
BA-1323220Q

PlaneWave CDK20 ASTROGRAPH F/6.8 WITH FUSED SILICA OPTICS

The 20" CDK is a revolutionary new telescope optical system that is designed to excel at imaging on large format CCD cameras while remaining an excellent instrument for visual use.

One of the unique features of the CDK design is its ease of collimation and achievable centering tolerance for a telescope of its class. This assures the user will get the best possible performance out of the telescope. The end result is a telescope which is free from off-axis coma, off-axis astigmatism, and curvature of field, yielding a perfectly flat field all the way out to the edge of a 52mm image circle.

  • CDK 20 Astrograph, 20 inch with Fused Silica Optics
  • modified to Dall-Kirkham, with fully corrected image field
  • with 8" Dovetail, focal length 3.454 mm (f/6,8), 52 mm field of view
  • Delta T Ready, 3,5" Hedrick Focuser and EFA Kit separately available

Features


Carbon Fiber Truss Design:

Minimizes thermal expansion which causes focus shift as temperature changes during an imaging session. Carbon fiber also reaches ambient temperatures quickly and is extremely lightweight and rigid to help ensure excellent imaging data is produced.

3D Printed Baffles:

PlaneWave uses digital 3D printing technology to produce lightweight baffle tubes. 3D printers add successive layers of material to construct a baffle system with precision positioned internal stray light baffles to minimize vignetting and maximize image contrast. Quality baffling makes an incredible difference in overall image quality, so we ensured an optimal design was created for our telescopes.

Dovetail Expansion Joint:

Allows for the difference in thermal expansion between carbon fiber and aluminum. The expansion joint allows the aluminum dovetail to expand and contract without stressing the carbon fiber lower truss. This results in images that are not distorted due to expansion, or contraction of the optical tube materials.

Delta-T Ready:

For added dew prevention, the CDK20 is internally wired with polyimide film heater pads and temperature sensor, which is ready to be controlled with the Delta-T via PlaneWave Interface 3 software.

Cooling Fans:

Three fans on the backplate of the optical tube pull air through the telescope and by the primary mirror. Three fans on the side of the optical tube also blow air across the primary to ensure a boundary layer of air does not distort images. These fans help the telescope reach thermal equilibrium quickly, further reducing any distortion in images due to temperature variations. The fans are controlled by a switch on the optical tube, or can be controlled by via PWI3 software if a PlaneWave Electronic Focus Accessory (EFA Kit) is purchased.

Fused Silica

Fused Silica is a synthetic amorphous silica glass of the highest purity and one of the most transparent glasses made. The optical and thermal properties of fused silica are superior to other types of glass due to its purity. Its transmission and homogeneity exceed those of crystalline quartz without the problems of temperature instability inherent in the crystalline form. Fused Silica has a coefficient of thermal expansion six times lower than Borosilicate (Pyrex) glass, which means that as fused silica cools down, it preserves its shape to a high degree of accuracy. This translates into consistent optical performance and unchanging focus over temperature changes. With its high melting temperature ()~ 1.600 degree Celsius), a very low coefficient of thermal expansion and resistance to thermal shock, fused silica is the material of choice for professional observatories as well as various scientific applications.

Spot Diagram

To the right are two simulations showing the CDK's stunning performance. The first is a diffraction simulation and the second is a spot diagram.

In both simulations the small squares are 9x9 microns, about the size of a CCD pixel. In the diffraction simulation the star images on axis and off-axis are nearly identical. In the spot diagram 21mm off-axis the spot size is an incredible 6 microns RMS diameter. For 26mm off-axis, a 52mm image circle, the RMS spot size is 11 microns. This means the stars across the entire focal plane are going to be pinpoints as small as atmospheric seeing will allow.

The spot diagram was calculated at 720, 585, and 430nm. Many companies show spot diagrams in only one wavelength, however to evaluate chromatic performance multiple wavelengths are required. Both of the simulations take into consideration a flat field, which is a more accurate representation of how the optics would perform on a flat CCD camera chip.


ΣΗΜΑΝΤΙΚΟ:

Για την αποστολή του τηλεσκοπίου, απαιτείται η μεταφορά του από το εξωτερικό, με έξτρα κόστος ειδικής συσκευασίας και μεταφορικών. Τα κόστη αυτά αφορούν την μεταφορά του τηλεσκοπίου από το εξωτερικό στην Ελλάδα και είναι ανεξάρτητα από το κόστος μεταφορικών εντός Ελλάδας. Παρακαλούμε, επικοινωνήστε μαζί μας για το συνολικό κόστος.

 

Τεχνικά Χαρακτηριστικά
Καθ.Βάρος (γρ.) 64000
Οπτικός Σχεδιασμός Κατοπτρικό Dall-Kirkham
Διάμετρος (mm) 508
Εστιακή Απόσταση - F (mm) 3454
Εστιακός Λόγος (f/) 6.8
Στήριξη Δεν περιλαμβάνεται στήριξη ή τρίποδας

In the box:

  • Heating elements for dew prevention – The heating pads on the primary and secondary mirror require the #1329110 Delta-T controller and sold separately
  • OTA cover – To protect the primary mirror and inside of the optical tube
  • Flash Drive – Contains software and instructions for collimation and spacing the primary to the secondary mirror
  • Wrench Set(5812A35) – Standard hex wrenches (European orders only)
  • Soft cover for secondary mirror
  • 12v AC adapter

Specifications:

Optical Design

Corrected Dall-Kirkham (CDK)

Aperture (mm)

20" (508 mm)

Focal Length

3.454 mm (135.98 inch)

Focal Ratio

f/6.8

Image Field

52 mm

Back Focus Distance

5.8" (147 mm) from Racked in Focuser

Central Obstruction

39% of the Primary Mirror Diameter

Substrate

Fused Silica

Optical length

47 inch (1.194 mm)

Optical Tube Weight

140 lbs (64 kg)

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