Ritchey-Chrétien
Telescopes
| Alluna Ritchey-Chrétien
telescopes convince two hyperbolic mirrors with outstanding universal Properties.
Compact design with low weight, color purity, planes, koma and astigmatism
free field of 65 mm in diameter. Very small spot diameter until the outer
edge of the image field. All components, optics, mechanics and software
meet
highest quality standards. |
Robust
CNC machined aluminium Carbon Truss Tube guarantees high stability and
easy handling. All major Tube components have a complex honeycomb pockets,
so could we carry an extremely light but highly stable tube. |
| Since the Ritchey-Chrétien
is a system with two mirrors, it has no chromatic aberration, therefore,
it can across the entire spectrum from ultraviolet to the be used long-wavelength
infrared (100nm-12mu). Through the excellent on-and off-axis image quality,
the large usable Field and the versatility of a Ritchey-Chrétien
system are our RC-telescopes especially designed for use in astrophotography
and the wide range of astronomical research. The RC telescopes are also
a great visual instrument and thus usable for Observatories serving the
public well suitable.
Despite the high quality
and the complete assembly of all components in Germany, it is us succeeded
in the price of our Ritchey-Chrétien Telescopes equal or even less
to maintain than other essential Telescope simpler systems of equal size.
This requires a Alluna Ritchey Chrétien telescope important components
such as the telescope control system already included. |
| Alluna
RC Optics |
| The optical design was from
one of the best European specialists in the field of telescope optics Developed
exclusively for Alluna Optics. In our own production of each single mirror
set with extreme precision and care, manufactured and tested. Of course,
each telescope is a detailed Certificate of using original Interferogram.
By using the double lens AFFC (Alluna Flat Field Corrector) is photographed
a plane koma and astigmatism free field of 65 mm diameter free of optical
vignetting be used. AFFC is Broadband coated 400-900
nm.
Spot diagrams composite
486-656 nm sample at 24 inches Alluna RC with AFFC
|
| Alluna
RC Truss OTA |
The optical performance,
the accuracy, reliability, and the demand for the highest Quality remain
with Alluna Ritchey-Chrétien telescopes not left to chance!
As in many other technical
areas of practice, we use specifically targeted at construction and design
of our systems, the indispensable support of modern CAD. Complex parts
and assemblies are accurately modeled as needed and in the run virtually
assembled.
OTA modeling in CAD |
Finite element analysis
Supporting components |
Thus, for example, in advance
all parts of the weight, stability and expansion behavior be optimized.
The extensive FEA (finite element analysis) helps In addition the process
of all structural elements due to stress-simulation analysis and is therefore
an important tool for targeted Construction.
The derived from CAD Design
data are "directly" in the currently most advanced CNC machines; overplayed
and it created the desired precision components for our OTAs. |
| Alluna
Telescope Control |
Attend to Your astro shots
or research work, the telescope-control control handles the basic functions
on the main telescope. On the one the air conditioning of the optical tube
and the main mirror, for the other focusing optics accepted.
 In
receive mode Climate they include accurate temperature information, the
control of the fan is fully automated, depending on the current delta between
ambient and primary mirror temperature. In the Foccusiermodus a large Display
the current focus position of digits, or inches specified. With the GoTo
function to stored positions focus position fast and precise automatic
hit, the so-called Focus-Drift is of course automatically compensated.
The Secondary-Focuser features
a resolution of 5904 digits per 1 mm, corresponding to a computational
step equivalent of 0.17µm rounded! The telescope control system has
additionally the mode CCD rotator. This includes all the functions for
a comfortable and precise control, for this Astrophotographers extremely
useful tool, is required.
A detailed explanation to
the functions of the telescope control system, please visit the appropriate
Product. |
| Basic
information all Alluna RC |
-
Available sizes: 16 / 18 / 20 / 24 inch f 8.1 System
-
Real Ritchey-Chrétien Telescope with two hyperbolic mirrors
-
Also available with glass ceramic Zerodur primary mirror
-
Interferometrically tested and certified optics min. 1 / 20 wave RMS /
633nm
-
High-quality aluminum 94% coating with plasma polymer protective layer
-
AFFC Field Corrector - flattened, koma and astigmatism free field of 65
mm diameter
-
AFFC Field Corrector - Broadband coated 400-900
nm
-
Future proof for even bigger CCD chip of the new generation
-
max. 1.5 micron rms spot radius of 25 mm off-axis / 486-656 nm
-
Available in the ultraviolet to infrared (coating depends)
-
large back focus area with 355 mm
-
heavy, stiffer CNC Truss carbon / Aluminum
-
easy adjustment and large adjust stable over a long time Info
-
vignetting free with large 4-inch connection
-
Secondary focus 5904 Digits / 1 mm! with position memory, automatic Focus-positioning,
auto-focus-drift-compensation
-
Temperature measurement directly at the mirror
-
OneView temperature monitor, automatic fan control
-
Telescope control system for automatic monitoring of Focus Temperature,
fan and CCD Bildfeldrotator on your PC Info
-
prepared for Instrumen Rotator Info
-
Mirror Baffle with internal knife-edge light stops
-
one USB cable is sufficient to control the entire telescope
-
ASCOM interface
-
short delivery
-
cheaper or slightly more expensive than, for example, a simple Dall-Kirkham
Telescope at much higher quality, features and better overall performance
of optical
-
absolutely high-quality optics, mechanics and software complete fabrication
'Made
in Germany " ! |
| Delivery |
-
Carbon Aluminum CNC Tube Truss
-
Losmandy or DDM85 Dovetail mounting plate, others on request
-
High quality Alluna Ritchey Chretien optics with Certificate
-
Telescope Control System more
info
-
Secondary focus, with drift compensation & position memory
-
ASCOM software interface |
| Price |
Alluna RC16 - Ritchey Chretien
telescope 16 inches f 8,1
Included Mounting Plate
& Telescope Control System
Price: EURO 20.925, ---
Alluna RC18 - Ritchey Chretien
Telescope 18 inch f 8,1
Included Mounting Plate
& Telescope Control System
Price: EIURO 24.286,--
Alluna RC20 - Ritchey Chretien
Telescope 20 inch f 8,1
Included Mounting Plate
& Telescope Control System
Price: EURO 28.487,--
Alluna RC24 - Ritchey Chretien
Telescope 24 Inch f 8,1
Included Mounting Plate
& Telescope Control System
Price: EURO 50.336,-- |
| Reference |
| are available for business
outside of Germany |
| Prices
in EURO without 19% German VAT plus shipping and crating |
| Delivery
times on inquires |
| trading
conditions |
Field corrector AFFC |
Takahashi Adjustable eyepiece
Diagonals |
| Optional
more |
- Either with glass ceramic
Zerodur or Astro Sitall primary mirror
- Large 100 mm CCD Bildfeldrotator
controllable from a PC -- more info
- Adapter 100x1 on 68x1
Zeiss
- Adapter 100x1 on 72x1
Takahashi System
- Adapters of different
lengths
- AFFC (Alluna Flat Field
Corrector) planes, coma and Astigmatismusfreies Field 65 mm Field
- IR telescope, Gold instead
of aluminum coating for the high IR range
- Takahashi Collimator --
for easy adjustment. Thus the adjustment is faster than a Newton Telescope!
- 2 "Star Diagonal
- Case for worldwide shipping |
If
interested, please contact us at - Contact
|
Alluna Ritchey Chretien
Telescope
in motion
Ritchey
Chrétien or Dall Kirkham
...
the differences
Easy
collimation of a Alluna
Ritchey
Chrétien Telescope
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