GSO400,
400MM TELESCOPE WITH CARBON OPEN TRUSS TUBE |
|
 |
|
Product features: |
|
-
Appature 16" / 406 mm |
-
Focal Length 3250 mm |
-
Focal ratio f/8 |
- Choice of field flatteners and
focal reducers. |
- Carbon truss tube with
2 Losmandy Level
dovetail bars |
- 99% dielectric
high-reflectivty coating on main-
and secondary mirror |
- Big corrected flat
field without need for
additional correctors |
-
3"
MONORAIL
Focuser with better
stability |
- Redesigned back plate,
decoupling of the focuser
from the telescope with seperate collimation. |
|
Astrofox
has optimized this 16" RC especiall for
astro photography.
The OTA comes with carbon trusses having
a thermal expansion of nearly 0. The OTA
weight is 37 kgs and it has a
Losmandy-style dovetail rail on both
sides.
Our 16" f/8 RC
Astrograph illuminates a max- field
diameter of approx. 70 mm.
Without corrector, 35 mm are possible.
In the latter configunartion, you have a
pure mirror system without any lenses.
You don´t need an IR cut filter and can
use the full spectrum with a suitable
CCD camera.
How to find the focus:
The RC has a generous back
focus allowing to attach many
accessories like off-axis-guiders,
filterwheels and much more. The distance
from the 2" connection of the focuser to
the focus point is 127mm. |
The Carbon Fiber
Truss Tube Design:
Lightweight yet strong carbon fiber
truss tubes have low thermal expansion
characteristics. Shifts in focus due to
temperature changes are minimized
because of this design. The trusses are
also designed to flex equally, keeping
the optics in collimation regardles
 |
|
The 3"
M-LRN Monorail Focuser:
The 3" Monorail focuser is a further
development of the crayford design. The
load is not carried by four (often
underdimensioned) ball bearings but on a
stainless steel track on the base, thus
preventing tilting and bending even
under high loads. It is countered by a
big knurled screw that centers the inner
tube exactly to the rail. The load is
distributed evely across the rail´s
surface.
Technical details of the focuser:
- Travel: ca. 80mm
- Free aperture: 68mm
- Guidance: by massive and fixed steel
rail
- 1:10 transmission for precise focusing
- 360° Rotation
- Adaption to 2" and (when screwed off)
female M68
thread, directly fitting to
TS 2.5" off-axis-guider |
Optical
Highlights:
The hyperbolic primary and hyperbolic
secondary are made from low expansion
quartz, and finished with a
scratch-resistant highly reflective 99%
dielectric coating for great contrast.
The primary mirror is fixed in place in
a metal mirror cell, and the secondary
resides in a metal housing that can be
collimated. The secondary mirror has a
center mark for easy and accurate
collimation.
Cooling
Fans:
The RC telescope has three small cooling
fans in the rear cell that help create
an ambient temperature within your
telescope for more stable viewing and
less fluctuation in focus. The fans are
powered by an external battery pack.
This battery holder accepts 8-AA
batteries (sold separately).
A Fixed Primary Eliminates Image Shift:
Schmidt-Cassegrain,m EHD, ACF... &
Mak-Cassegrain telescopes achieve focus
by moving the primary mirror back and
forth inside the optical tube assembly,
and this movement can cause image shift.
While manufacturers have done a pretty
good job of minimizing image shift on
their telescopes, a moveable mirror
makes it almost impossible to eliminate
it completely. The Ritchey-Chretien has
a primary that is fixed in place,
removing the possibility of image shift
and also the job of collimating the
primary.
Why the
RC Telescope is better, than Schmidt
Cassegrain telescopes with correctors:
This is also the
advantage of RC telescopes against
Celestron EHC or Meade ACF telescopes.
These telescopes needs a lens corrector
wich is integrated in the optical
system. The RC is a true reflection
system without lens corrector and with a
really bright image.
The optical advantages of the GSO400 RC
*Ritchey Chrétien Astrographs for
astrophotography:
The GSO400 Astrograph is a real
Ritchey-Chrétien reflector telescope.
Contrary to Maksutovs or
Schmidt-Cassegrains which have spherical
mirrors and need image correctors, and
contrary to Newtonians that need coma
correctors, the RC system is a well
corrected photographical instrument that
uses only mirrors (no false colour!) and
does not require any corrector with many
cameras. |
 |
|
 |
GSO400 |
EUR 6500,-
excl.
VAT and shipping |
|