Alluna Newton astrographs
are robust and reliable observatory telescopes with fast apertures
of f 3.0 to f 4.0. Designed for
astrophotography but also for visual use and ideal for technical applications.
At the heart of every astrograph, in the optics we do not make any experiments.
Only high quality parabolic mirrors from our own production are used. The
tube is made as, as in the Ritchey-Chrétien telescopes in honeycomb
pocket structure of aluminium and carbon fibre. A very elaborate production
method on the cutting edge of technology, absolutely rigid and highly collimation
stable.
Alluna
Newton telescopes - some advantages at a glance
|
 |
Highest
production quality |
|
Can
be remote controlled |
|
Precision
optics
Made by Alluna |
|
Feasible
apertures: f 3,0 to f 4,0
selectable |
|
Robust
and non-warping
lightweight
tube |
|
Upper
part rotatable (NA16 to NA20) |
|
Easy
adjustment and high
collimation
stability |
|
3
inch focuser |
|
TCS
control, included,
ASCOM compatible |
|
Robotic main
mirror cover |
A perfect parabolic shape of the primary
mirror and a low surface roughness are in a Newtonian system, the pre-requisites
for sharp and crisp images. We guarantee that these conditions are met
in each of our Newton astrographs. Our astrographs are available as standard
light strong f3,8 system in four sizes: 16, 18, 20 and 24 inches in the
standard. For whoever needs an even greater light intensity, we can offer
apertures down to f 3.0.
Since good correctors and reducers
are already available on the market for Newtonian systems, we have omitted
a developing them ourselves. You can use on our astrographs all Wynne correctors,
Barlows and reducers with 2 inch and 3 inch diameter. If necessary, we
can advise you.
 You
will hardly find a Newton astrographs which has such consistent visual
and mechanical precision down to the smallest detail as has our aluminium
carbon truss astrographs. All major parts are machined from solid aluminium.
Through a honeycomb pocket structure enormous stability and warping resistance
is attained in such a lightweight construction.
For construction and design of the
systems we use the indispensable support of the latest 3D CAD. Complex
parts and assemblies are modelled exactly as required and assembled virtually
in advance. Thus in advance all parts can be optimized, for example, for
weight, stability and expansion behaviour.
 |
To always be able to set the best
view the top of the NA16, NA18 and NA20 is manufactured as infinitely rotatable
in a highly accurate fit. By loosening two screws the whole upper part
can be easily rotated. The fit is very accurate, the adjustment should
be controlled at one turn of a screw. In addition, the entire shell, for
example, for transportation is fully removable.
All our astrographs possess as standard
a motorised focuser for 2 "and 3" accessories. |
As with our Ritchey-Chrétien
telescopes the telescope control system (TCS) assumes control also in Newton
astrographs of the elementary principal functions of the telescope. Firstly,
the climate of the optical tube and the primary mirror, secondly, the focusing
on the eye piece, the on/off of the secondary mirror heating and the control
of the optional robotic primary mirror cover (Information
on DustCover).
In
the air mode you also get accurate temperature information. In the air
mode you receive precise temperature information, the control of the fan
is fully automatic, depending on the current delta between ambient and
main mirror temperature. In focussing mode the current focus position is
displayed in digits, mm or inches on the large display of a PC. With the
GoTo function you can load stored focus positions automatically, quickly
and accurately. The so-called focus drift can be compensated automatically.
For a detailed explanation of the functions of the Telescope Control System
TCS, please visit the TCS
product page.
Technical
Data of RC telescopes at a glance
|
| . |
Alluna NA16
|
Alluna NA18
|
Alluna NA20
|
| Primary mirror
Ø |
415 mm
|
465 mm
|
515 mm
|
| Optical Ø |
408 mm
|
458 mm
|
508 mm
|
| Standard aperture |
f 3,8
|
f 3,8
|
f 3,8
|
| Secondary mirror
Ø |
140
|
158
|
170
|
| Obstruction |
34%
|
34%
|
33%
|
| Tube upper part
rotatable |
Yes
|
Yes
|
Yes
|
| Weight |
52 kg
|
68 kg
|
88 kg
|
| Focuser |
3 inches
|
3 inches
|
3 inches
|
| Extended warranty |
5-Year / included |
5-Year / included |
5-Year / included |
| Telescope Control |
TCS / included |
TCS / included |
TCS / included |
|
Datasheet Newton astrographs
. |
|
1
2