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Alluna RC 望远镜

Ritchey-Chrétien telescopes with two hyperbolic mirrors convince with their outstanding universal properties. The compact design along with low weight, colour purity, planar field free of coma and astigmatism with 65 mm in diameter. Smallest possible spot diameter up to the outer edges of the image field. All components, optics, mechanics and software meet highest quality standards.
The robust CNC machined Aluminium Carbon Truss tube guarantees high adjustment stability and easy handling. All major tube components feature a complex honeycomb pocket structure, allowing us to realise an extremely lightweight yet higly stable tube.
Since the Ritchey-Chrétien is a system with two mirrors, it has no chromatic aberration, hence it can be used throughout the entire spectrum from ultraviolet to the long-wave infrared (100nm-12mu). Through the excellent image quality, on-and off-axis, the large usable field and the versatility of a Ritchey-Chrétien system are our RC-telescopes are particularly suitable for being applied in astrophotography and the wide range of astronomical research. The RC telescopes are also a great visual instrument and thus are also well suitable for observatories serving the public.
Alluna Ritchey-Chretien Telescope are designed without compromise on optical and mechanical quality. Moreover, a Alluna Ritchey Chrétien telescope already comes with important components such as the Telescope Control System (TCS) and a high precision secondary mirror focusing.
The high precision focusing of the secondary mirror that is included in delivery allows to connect the 100 mm exit at the back side fixed and absolutely shake/bending-free with the telescope. Instrument loads such as CCD-Cameras or Spectrometer of more than 12 kilograms ask because there is no problem. In special design already implemented instrument loads on the back of more than 30 kg. Contrary to telescopes using a mechanical Focusers at the exit no deflexion or shaky connections through heavy weight of, for example a heavy CCD camera may occur.
The secondary focuser features a resolution of 3936 digits per 1 mm, corresponding to a mathematical step width of rounded 0.25 on Secondary mirror respectively 0,0019 mm on CCD-Chip !

Alluna RC Optics

Every single mirror set is being manufactured and tested with extreme precision and care in our own production. As a matter of course we deliver a detailed certificate with interferogram with every telescope.
Alluna Ritchey Chretien telescopes can be used with a large usable field without corrector lenses. For large CCD-Cameras a Flat Field Corrector and a Flat Field Reducer is available.

Using the double lens Alluna Flat Field Corrector (AFFC) allow to use a planar field of 65 mm in diameter free of coma and astigmatism for photographic purposes. The usual lens size of 400 to 700 nm has been increased to 400 - 900 nm. You will receive an outstanding and future-proof optics perfectly suitable for bigger 45x45 mm CCD chips of the newest generation, too. Looking through our RC telescopes is visually impressive, the sharp and coma-free picture will convince you and your visitors.

For focal length reduction is a 4 Inch .74 x reducer-corrector (AFFR) available. The focal length is reduced from f8,0 to f6,0. The field is fully corrected of 60 mm

The spot diagram shows the fully corrected and flat 65 mm field which is achieved with the Alluna AFFC corrector. The RMS radius is 32 mm from the optical axis of less than 2 microns. Please note that the box size is only 14.

Basic information about Alluna RC

- Available sizes: 16 / 18 / 20 / 24 inches f 8,0 system
- Real Ritchey-Chrétien telescope with two hyperbolic mirrors
- Quality Alluna optics selectable Pyrex or glass ceramics Zerodur
- Optics interferometrically tested and certified
- High-quality aluminium coating with SIO protective layer
- AFFC 4" Field corrector - flattened, coma/astigmatism-free field of 65 mm diameter, annealed 400-900 nm
- AFFR 4" Reducer Corrector x.74, coma/astigmatism-free field of 65 mm diameter, annealed 400-700 nm
- Future-proof, also suitable for the bigger CCD chips of the new generation
- max. spot radius: 1.5 micron rms 25 mm off-axis / 486-656 nm (AFFC)
- Applicable from ultraviolet to infrared
- Large-sized back focus area of 355 mm from mkirror, 250 mm from backplate.
- weight-reduced, honeycomb structure, warp-resistant carbon / aluminium CNC truss tube
- easy adjustment and collimations free, Manual
- vignetting-free through large 4-inch connection and optimized Baffle System
- Secondary mirror focussing with position memory, automatic focus positioning, automatic focus-drift compensation
- OneView temperature monitor, automatic fan control
- Telescope control system for automatically monitoring focus, temperature, robotic Dust Cover, CCD precision rotator on your PC Info
- Ready for image field rotator  Info
- Only one USB cable for controlling the entire telescope, ASCOM interface
- absolutely high-quality optics, mechanics and software; Complete manufacturing " Made in Germany "

Alluna RC望远镜技术参数

。	Alluna RC 16	Alluna RC 18	Alluna RC 20	Alluna RC 24
主镜	16寸/415毫米	18寸/465毫米	20英寸/515毫米	24寸/610毫米
最大焦比(f3.0)	f3,0	f3,0	f3,0	f3,0
焦比	f8,0	f8,0	f8,0	f8,0
次镜直径	158毫米	166毫米	185毫米	215毫米
次镜遮挡率(％)	40	39	39	37
后焦距	353毫米	350毫米	355毫米	355毫米
重量(公斤)	46公斤	60公斤	79公斤	120公斤
。
Correctoren：
RC (f8.0)改正镜：65mm	2片95毫米 M100x1	2片95毫米 M100x1	2片95毫米 M100x1	2片95毫米 M100x1
RC (f8.0-f6.0)减焦镜：60mm	3片93毫米 M100x1	3片93毫米 M100x1	3片93毫米 M100x1	3片93毫米 M100x1