Photoshop Becker

CELESTRON RASA 8" - Rowe-Ackermann Schmidt Astrograph Telescope 203/400mm f/2

CELESTRON RASA 8" - Rowe-Ackermann Schmidt Astrograph

  • Flat field free of optical aberrations like field curvature, coma, astigmatism and chromatic aberration across an entire APS-C sensor.
  • Unlike the larger RASAs that work with DSLR and large CCD cameras, the 8” model was designed with color astronomical CMOS cameras, smaller CCD cameras, and mirrorless cameras in mind. The telescope does not work with standard DSLR cameras.
  • Ultra-Stable Focus System – precision linear ball bearing virtually eliminates image shift.
  • Integrated air cooling system –12V DC MagLev fan reduces cooldown time and provides optimal air flow while filtering out dust.
  • Internal filter mount – seamlessly accommodates a Light Pollution Imaging Filter into the optical path.
  • CGE dovetail mounting rail.
  • Performs over a wider spectral range than most telescopes, from 390-800 nm, so more of the light passing through the astrograph is in sharp focus.
  • Made by Celestron, USA

Includes or respectively is compatible with the following Celestron-Technologies:

StarBright®-XLT-Systems - High Performance Coatings CELESTRON RASA


Description

Capture spectacular wide-field deep sky images in seconds with Celestron’s portable astrograph, the 8” Rowe-Ackermann Schmidt Astrograph (RASA). This incredibly fast f/2.0 system is the perfect companion to today’s color astronomical CMOS cameras, smaller CCD cameras, and mirrorless cameras. Thanks to its fast focal ratio and patented optical design, you can produce sharp, detailed images and, in many cases, skip the autoguider completely. Weighing in at just 17 pounds, it’s easy to transport your 8” RASA to the most remote dark sky locations.

 

RASA Performance Made for Everyone

The 8” RASA is an imaging telescope that delivers a flat field without optical aberrations for razor sharp stars across a wide field of view. It can capture stunning deep-sky astronomical images without the challenges typically presented by longer focal length instruments at a fraction of the cost of those systems.

The latest addition to the RASA family, this 8” version is a much more portable and affordable version of the heralded RASA 11, which was introduced to much acclaim in 2014. With the 8” RASA joining the lineup, a wider range of astroimagers can enjoy the benefits of the RASA design. It has many of the same thoughtfully designed features as its “big brother” RASA 11, including the integrated air-cooling system, internal filter mount, and sturdy CGE dovetail mounting bar.

Purely designed for imaging, the 8” RASA cannot be used visually. The prime focus focal plane is located at the front of the optical system, so it cannot accommodate a traditional eyepiece.

Shorter Exposure Times and Virtual “Real-Time” Observing

Since it is an F/2.0 optical system, imagers can use shorter exposure times to capture detail in faint objects. When combined with sensitive cameras and the proper “live stacking” software, the 8” RASA can provide an almost real-time observing experience. View images on a computer instantly that are brighter and more detailed than can be seen in much bigger telescopes with the naked eye.

Because shorter exposure times are possible, your equatorial mount won’t need to accurately track over extended periods. The 8” RASA’s relatively short 400mm focal length also lessens equatorial tracking demands. In many cases, autoguiding will not be required. Weighing only 17 lb, this optical tube pairs perfectly with a wide variety of mounts.

Ultra-Stable Focus System

With the launch of the 8” RASA, Celestron is unveiled a focuser design that mitigates lateral movement of the primary mirror when focusing, slewing, or tracking with the astrograph. Focusing is easier, more accurate, and more stable than ever. The key to the Ultra-Stable Focus System is a precision linear ball bearing, which is tested during assembly to ensure optimal results.

 

Built for Today’s Latest Cameras

Unlike the larger RASAs that work with DSLR and large CCD cameras, the 8” model was designed with color astronomical CMOS cameras, smaller CCD cameras, and mirrorless cameras in mind. The telescope does not work with standard DSLR cameras. It is optimized for sensors with up to a 22mm diagonal, but performs well with sensors up to 32mm diagonal. The APS-C sized sensors used in many mirrorless cameras are a good choice. 42mm full frame sensors will also work, but performance will be poor at the edges of the sensor and field illumination will be reduced. Additionally, we do not recommend pairing RASA 8 with any camera body more than 4” in diameter. See the chart below to determine if your camera is compatible with RASA 8.

CameraCompatible with RASA 8?Adapter required
Astronomical CMOS/CCD camera with C-mountYesC-mount adapter (included)
Astronomical CMOS/CCD camera with M42-thread mountYesM42 adapter (included) with M42 extension tubes (not included)
Astronomical CMOS/CCD camera with other mountYesCustom camera adapter
Canon mirrorless with APS-C sensorYes

Canon mirrorless adapter

(sold separately)

Sony mirrorless with APS-C sensorYes

Sony mirrorless adapter

(sold separately)

Canon mirrorless with full frame (42mm) sensorYes, but not optimized across the full sensor

Canon mirrorless adapter

(sold separately)

Sony mirrorless with full frame (42mm) sensorYes, but not optimized across the full sensor

Sony mirrorless adapter

(sold separately)

DSLRNo--

Unique Optical Design

RASA’s optical design is patented (US 2016/0299331 A1). The design consists of a Schmidt corrector, primary mirror, lens group, and optical window. The lens group contains 4 elements and utilizes rare-earth elements. Unlike many telescopes that only perform well over the visible spectrum (400-700nm), the 8” RASA’s optics are designed to perform over a wider spectral range, from 390-800nm. This allows more of the light emitted from the astronomical object to be sharply focused in the image.

With many imaging systems, adding an extra piece of flat glass such as a filter does not change optical performance. However, that is not the case with super-fast optical systems like the RASA. Our engineers addressed this by designing the RASA with a removeable optical window, so you can maintain peak optical performance if a filter is added or if a camera has its own optical window. Celestron offers a Light Pollution Imaging Filter designed specifically for the 8” RASA, which mounts in place of the optical window.

All refractive optical surfaces are coated with StarBright XLT coatings, while the primary mirror uses enhanced aluminum coatings. This maintains high light transmission through the entire optical system.

When compared with “Hyperstar SCT” systems, the RASA 8 provides better optical performance and field illumination.


Videos

RASA 8 F/2 Has ARRIVED (Astrophotography)

The video opens in a new window.

Chasing The Andromeda Galaxy - Celestron RASA 8"

The video opens in a new window.


Optical Tube Info

Optical DesignRowe-Ackermann Schmidt Astrograph
Aperture203mm (8")
Focal Length400mm (15.74")
Focal Ratiof/2.0
Central obstruction diameter93mm (3.66") (46% of aperture diameter)
Light Gathering Power (Compared to human eye)843x
Resolution (Rayleigh)0.68 arc seconds
Resolution (Dawes)0.57 arc seconds
Image Circle22mm (.86") Ø, 3.15°
Useable field32mm (1.26") Ø, 4.6°, only minimal performance loss at edge of FOV
Wavelength range390 - 800 nm
Spot size< 4.6 µm RMS across image circle
Optical CoatingsStarBright XLT
Off-axis Illumination93% at 11mm (.43") off-axis
Optical Window46mm (1.81") Ø
Back focus with included camera adapter25mm (.98")
Back focus from top of threaded collar29mm (1.14")
Optical TubeAluminum
Optical Tube Length628mm (24.7") length | 235mm (9.3") diameter
FocuserUltra-Stable Focusing System
FinderscopeNot included
Optical Tube Weight17 lbs (7.7 kg)
Other FeaturesAir-cooling system, integrated filter mount
Included itemsM42 camera adapter, C-thread camera adapter, fan battery pack
DovetailCGE Dovetail Bar


  • » photoshop-becker.de « Item No. 13067 | EUR 2.399,00

Delivery status: in stock Condition: new

Manufacturer: CELESTRON EAN: 50234910736
More Items from this Category Similar items Bestseller
CELESTRON StarSense Explorer LT 70AZ Smartphone App-Enabled Telescope 70/700mm
CELESTRON StarSense Explorer LT 70AZ Smartphone...
239.00 EUR
CELESTRON StarSense Explorer LT 127AZ Telescope Smartphone Control 127/1000mm
CELESTRON StarSense Explorer LT 127AZ Telescope...
329.00 EUR
CELESTRON StarSense Explorer DX130AZ Smartphone App-Enabled Telescope 130/660mm
CELESTRON StarSense Explorer DX130AZ Smartphone...
649.00 EUR
CELESTRON Astro Fi 5 Wi-Fi SCT Schmidt-Cassegrain GoTo Telescope 125/1250mm
CELESTRON Astro Fi 5 Wi-Fi SCT Schmidt-Cassegra...
889.00 EUR
CELESTRON Focusing Motor for SC/EdgeHD Teleskopes Tubes
CELESTRON Focusing Motor for SC/EdgeHD Teleskop...
339.00 EUR
CELESTRON NexStar SLT 127 MAK 127/1500 GoTo-Telescope 127/1500mm
CELESTRON NexStar SLT 127 MAK 127/1500 GoTo-Tel...
945.00 EUR
CELESTRON NexStar 6 SE Goto-Schmidt-Cassegrain Telescope 150/1500mm
CELESTRON NexStar 6 SE Goto-Schmidt-Cassegrain ...
1,659.00 EUR
CELESTRON StarSense Explorer DX 102AZ Smartphone App-Enabled Refractor Telescope
CELESTRON StarSense Explorer DX 102AZ Smartphon...
625.00 EUR
Konus Konusmotor-130 Newtonian Telescope 130/1000mm motorized + Software
Konus Konusmotor-130 Newtonian Telescope 130/10...
439.00 EUR
CELESTRON StarSense Explorer LT 114AZ Smartphone-Controlled Telescope 114/1000mm
CELESTRON StarSense Explorer LT 114AZ Smartphon...
295.00 EUR
CELESTRON Cometron FirstScope 76 Dobson/Newton Telescope 76/300mm
CELESTRON Cometron FirstScope 76 Dobson/Newton ...
116.90 EUR
CELESTRON C5 Schmidt-Cassegrain Telescope 50x Magnification 127/1250mm
CELESTRON C5 Schmidt-Cassegrain Telescope 50x M...
909.00 EUR
CELESTRON NexStar SLT 127 MAK 127/1500 GoTo-Telescope 127/1500mm
CELESTRON NexStar SLT 127 MAK 127/1500 GoTo-Tel...
945.00 EUR
CELESTRON StarSense Explorer DX 102AZ Smartphone App-Enabled Refractor Telescope
CELESTRON StarSense Explorer DX 102AZ Smartphon...
625.00 EUR
CELESTRON NexStar 4SE Goto Maksutov-Cassegrain Telescope 102/1325mm
CELESTRON NexStar 4SE Goto Maksutov-Cassegrain ...
1,045.00 EUR
CELESTRON PowerSeeker 127EQ-MD Motor Drive incl. SmartPhone Adapter 127/1000mm
CELESTRON PowerSeeker 127EQ-MD Motor Drive incl...
359.00 EUR
CELESTRON StarSense Explorer LT 70AZ Smartphone App-Enabled Telescope 70/700mm
CELESTRON StarSense Explorer LT 70AZ Smartphone...
239.00 EUR
CELESTRON StarSense Explorer LT 127AZ Telescope Smartphone Control 127/1000mm
CELESTRON StarSense Explorer LT 127AZ Telescope...
329.00 EUR
CELESTRON StarSense Explorer DX130AZ Smartphone App-Enabled Telescope 130/660mm
CELESTRON StarSense Explorer DX130AZ Smartphone...
649.00 EUR
CELESTRON Astro Fi 5 Wi-Fi SCT Schmidt-Cassegrain GoTo Telescope 125/1250mm
CELESTRON Astro Fi 5 Wi-Fi SCT Schmidt-Cassegra...
889.00 EUR
CELESTRON Focusing Motor for SC/EdgeHD Teleskopes Tubes
CELESTRON Focusing Motor for SC/EdgeHD Teleskop...
339.00 EUR
CELESTRON NexStar SLT 127 MAK 127/1500 GoTo-Telescope 127/1500mm
CELESTRON NexStar SLT 127 MAK 127/1500 GoTo-Tel...
945.00 EUR
CELESTRON NexStar 6 SE Goto-Schmidt-Cassegrain Telescope 150/1500mm
CELESTRON NexStar 6 SE Goto-Schmidt-Cassegrain ...
1,659.00 EUR
CELESTRON StarSense Explorer DX 102AZ Smartphone App-Enabled Refractor Telescope
CELESTRON StarSense Explorer DX 102AZ Smartphon...
625.00 EUR
We accept all eBay payment options.
For UK residents only: UK Import duties and taxes, if any, have to be paid by the recipient prior to delivery. The logistics partner will inform you prior of delivery.

Our logistic partner are:

Wir versenden mit DPD Wir versenden mit DHL Expess Wir versenden mit GLS Wir versenden mit Deutscher Post
We accept all eBay payment options.
For UK residents only: UK Import duties and taxes, if any, have to be paid by the recipient prior to delivery. The logistics partner will inform you before delivery.

Our logistic partners are:

Wir versenden mit DPD Wir versenden mit DHL Expess Wir versenden mit GLS Wir versenden mit Deutscher Post

    Batterieentsorgung

    Der nachfolgende Hinweis richtet sich an diejenigen, die Batterien oder Akkus oder Produkte mit eingebauten Batterien oder Akkus nutzen und in der an sie gelieferten Form nicht mehr weiterveräußern (Endnutzer):

    1. Unentgeltliche Rücknahme von Altbatterien und Altakkus: Batterien und Akkus dürfen nicht über den Hausmüll entsorgt werden.

    Sie sind zur Rückgabe von Altbatterien und Altakkus gesetzlich verpflichtet, damit eine fachgerechte Entsorgung gewährleistet werden kann. Sie können Altbatterien und Altakkus an einer kommunalen Sammelstelle oder im Handel vor Ort abgeben. Auch wir sind als Vertreiber von Batterien und Akkus zur Rücknahme von Altbatterien und Altakkus verpflichtet, wobei sich unsere Rücknahmeverpflichtung auf Altbatterien und Altakkus der Art beschränkt, die wir als Neubatterien und Neuakkus in unserem Sortiment führen oder geführt haben. Altbatterien und Altakkus vorgenannter Art können Sie daher entweder ausreichend frankiert an uns zurücksenden oder sie direkt bei uns unter der folgenden Adresse unentgeltlich abgeben:

    Photoshop Becker
    Breslauer Str. 2c
    D-65307 Bad Schwalbach

    2. Bedeutung der Batteriesymbole

    Batterien und Akkus sind mit dem Symbol einer durchgekreuzten Mülltonne (s.u.) gekennzeichnet. Dieses Symbol weist darauf hin, dass Batterien und Akkus nicht in den Hausmüll gegeben werden dürfen. Bei Batterien und Akkus, die mehr als 0,0005 Masseprozent Quecksilber, mehr als 0,002 Masseprozent Cadmium oder mehr als 0,004 Masseprozent Blei enthalten, befindet sich unter dem Mülltonnen-Symbol die chemische Bezeichnung des jeweils eingesetzten Schadstoffes – dabei steht "Cd" für Cadmium, "Pb" steht für Blei, und "Hg" für Quecksilber.



    Spirallampenentsorgung

    Was bei Lampenbruch zu tun ist

    Energiesparlampen enthalten eine sehr geringe Menge an Quecksilber. Aber es gilt: Bei normaler Anwendung sind Energiesparlampen völlig ungefährlich. Vor, während und nach dem Betrieb kann kein Quecksilber aus der Lampe entweichen. Die einzige Kontaktmöglichkeit ergibt sich, wenn Ihre Sparlampe zerbricht. In diesem Fall entweicht das Quecksilber langsam in die Luft, da es bei Raumtemperatur verdampft. Die Konzentration ist dabei aber sehr gering und liegt deutlich unterhalb der in Deutschland geltenden Grenzwerte. Für zerbrochene Sparlampen gelten – wie für intakte oder nicht länger funktionsfähige Energiesparlampen auch – spezielle Empfehlungen zur Entsorgung. Beachten Sie daher bitte folgende Hinweise:

    Was Sie tun sollten:

    • Wenn die Lampe in einer Leuchte zerbrochen ist, trennen Sie zuerst die Leuchte vom Stromnetz, um Stromschläge zu vermeiden.
    • Stoßlüften Sie den Raum für 10 – 15 Minuten und verlassen Sie diesen.
    • Schneiden Sie sich nicht an den Glasscherben. Tipp: ziehen Sie Einweg- oder Haushaltshandschuhe an.
    • Sammeln Sie alle Teile der Lampe auf, möglichst durch Aufkehren.
    • Nutzen Sie ein angefeuchtetes Einweg-Haushaltstuch oder auch ein Klebeband, um kleine Stücke und Staub aufzunehmen.
    • Wenn die Oberfläche keine andere Wahl lässt (Teppich), verwenden Sie einen Staubsauger.
    • Entsorgen Sie den Staubsaugerbeutel bzw. den Inhalt im Anschluss.
    • Verpacken Sie Lampenreste, Einwegtuch, usw. in einen festverschließbaren Plastikbeutel oder ein Schraubglas.
    • Entsorgen Sie sowohl zerbrochene als auch nicht-funktionsfähige Lampen bei der nächsten Altlampen-Annahmestelle.


    Was Sie wissen müssen:

    Das Einatmen von Quecksilberdampf ist die häufigste Aufnahmeart von Quecksilber in den Körper. Sie haben aber Zeit genug, alles in Ruhe zu reinigen, denn bei Raumtemperatur verdampft flüssiges Quecksilber nur sehr langsam. Bei einer zerbrochenen Lampe kann das Quecksilber an den Bruchstücken haften und über die Zeit in der Wohnung verdampfen. Das können Sie durch die oben genannten einfachen Maßnahmen verhindern. Wenn Sie die Lampenbruchstücke sorgfältig aufnehmen, in einem Plastikbeutel dicht verschließen und bis zur Entsorgung außerhalb Ihrer Wohnung lagern, ist das Quecksilber nicht im Raum.

    Wie Sie Lampenbruch vermeiden können: Egal ob Glüh-, Halogen- oder Energiesparlampe – der Bruch einer Lampe lässt sich nie ganz ausschließen. Vor allem beim Auswechseln der Lampe kann es zu Glasbruch kommen.

    Folgende Tipps sollen helfen, Missgeschicke zu vermeiden:


    • Stellen Sie – um Stromschläge zu verhindern – beim Lampenwechsel unbedingt sicher, dass die Leuchte vom Stromnetz getrennt ist.
    • Wechseln Sie die Lampe erst, wenn sie abgekühlt ist.
    • Fassen Sie die Lampe beim Wechsel am Kunststoffsockel oder ggf. am Hüllkolben an, nicht an den Glasrohren.
    • Wickeln Sie nicht mehr funktionsfähige Lampen bis zur Rückgabe in ein weiches Tuch oder legen Sie sie in einen sicheren Behälter.
    • Nehmen Sie die neue Lampe erst unmittelbar vor dem Eindrehen in die Fassung aus der Verpackung.
    • Durch den Gehalt geringer Mengen giftigen Quecksilbers dürfen Spiral-Tageslichtlampen gemäß Elektro- und Elektronikgerätegesetz (ElektroG) nicht im Hausmüll entsorgt werden. Entsorgen Sie sowohl zerbrochene als auch nicht funktionsfähige Lampen bei der nächsten Altlampen-Annahmestelle.
You will receive automatically after each purchase to your eBay specified email address a mail to initiate the purchase.

In the checkout process, you can combine multiple purchases from us and save shipping costs, adjust your billing and shipping address, the payment method and delivery. You will also find all the information about the payment, such as our account in case of bank transfer.

Warranty conditions with 1/2/3/5 years warranty



Photoshop Becker takes over a first manufacturer warranty. The legal claims arising from the statutory warranty remain unaffected. The manufacturer's warranty is without prejudice to mandatory statutory liability, such as the product liability law, in cases of intent and gross negligence, for injury to life, limb or health by Photoshop Becker or its agents
"Consumer" for the purposes of this manufacturer's warranty is any natural person who is a first-time customer of the product and has not purchased it to resell it or install it as part of their commercial or self-employed professional activity with third parties. "First Customer" is the consumer who first purchased the product from Photoshop Becker.

Valid for products purchased by new customers from 01.01.2017 (invoice / purchase receipt):

Photoshop Becker guarantees first-time customers that its products are free of material, manufacturing and Design errors are. The product must already have the error that caused the damage this date. Claims for compensation for consequential damage or product liability exist only in accordance with the statutory provisions.

This warranty is valid for the period specified in the product description (if specified) from the date of purchase (invoice date) by the first customer. The warranty period shall not be extended due to the provision of services under this warranty, in particular for repair or replacement. The warranty period does not start in these cases.

The rights of this warranty can be claimed by the consumer by written error notification within the warranty period to Photoshop Becker. The prerequisite is that the consumer displays the error within two weeks after he has recognized it, or should have recognized it. It is the responsibility of the consumer to prove that the guarantee has not expired (eg by presenting proof of purchase).

Photoshop Becker is free to repair the product, make an exchange or refund the purchase price to the consumer. The costs of repair and replacement of own labor costs. When replacing the old product is replaced by a new product of the same type, same quality and same type free of charge. If the affected product is no longer produced at the time the error is reported, Photoshop Becker is entitled to supply a similar product. Transport, and / or dispatch to and from Photoshop Becker carries thereby the consumer.

If Photoshop Becker selects a refund of the purchase price and confirms this in writing, the consumer will return the product and Photoshop Becker will refund him the purchase price paid.

Further claims are excluded.

Condition for the effectiveness of this guarantee is the proper installation, use and maintenance according to the operating instructions and the recognized rules of technology.

The warranty does not extend to:

  • wear parts, such as Rubber coatings and gaskets
  • fragile parts, such as flash tubes, glass, incandescent lamps
  • consumables, such as Batteries
  • slight deviations of the products from the intended condition, which have no influence on the use value of the product
  • Improper use, operating and operating errors, damage due to aggressive environmental influences, chemicals, cleaning agents
  • Defects in the product caused by installation and transportation of the purchased item

The validity of the guarantee ends at:

  • Failure to follow the provided installation, care and use instructions
  • Installation, maintenance, repair or care by non-expert persons
  • Damage due to normal wear and tear or deliberate damage - in case of negligent cause of damage a contributory negligence will be credited mutually
  • improper installation or commissioning
  • lack of or faulty maintenance
  • Products that have not or will not be used for their intended purpose
  • Damage caused by force majeure or natural disasters, especially, but not limited to floods, fires


If a product defect is not covered by this warranty, the costs incurred in shipping and transporting the product shall be borne by the consumer. In addition, the consumer must bear the costs, including any labor costs, incurred in the examination of the product, as well as the costs of removal and reinstallation of the product. If the consumer desires to carry out the repair for information about the non-application of the guarantee and the anticipated costs of the repair, he shall bear the cost of replacement parts and labor costs. If the product has not already shown the defect on delivery, Photoshop Becker decides in individual cases whether an elimination by way of goodwill will be carried out. In this case, the consumer has no legal claim to the elimination of defects.

The consumer is entitled to legal rights in addition to the rights under the guarantee. These rights, which may be more favorable to the consumer, are not limited by the guarantee. The warranty also does not affect the rights of the primary customer and, if applicable, the consumer against the seller from whom the first customer purchased the product.

This guarantee is subject to German law, excluding the UN Convention on the International Sale of Goods (CISG) of April 11, 1980. Place of performance for the obligations under this guarantee is Bad Schwalbach, Germany. As far as permissible, the place of jurisdiction is Bad Schwalbach, Germany.

Photoshop Becker
Breslauer Str. 2c
D-65307 Bad Schwalbach
.::. Photoshop Becker .::. ©