Celestron Astro Fi 102 Bedienungsanleitung
Lesen Sie kostenlos die š deutsche Bedienungsanleitung fĆ¼r Celestron Astro Fi 102 (24 Seiten) in der Kategorie Teleskop. Dieser Bedienungsanleitung war fĆ¼r 14 Personen hilfreich und wurde von 2 Benutzern mit durchschnittlich 4.5 Sternen bewertet
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1 | ENGLI SH
Telescope Instruction Manual
Model: 91078
V2
911
10
2 | ENGLI SH
Mounting the Astrograph
The RASA 36 cm has a CGE dovetail mounting rail. This is compatible with mounts that
accept a CGE or Losmandy-D style dovetail. The astrograph itself weighs 75 lb., so a mount
with a load capacity more than that is recommended. This will ensure good performance of
the mount when a camera and any accessories are added.
Because of its size and weight, moving and lifting the RASA 36 cm onto a mount will take
two people. Use the handles on the rear cell as needed.
For custom mounting applications, there are two sets of two M8x1.25 mounting holes in the
rear cell. These utilize threaded inserts for extra reinforcement.
Installing a Camera
The supplied M48 camera adapter can be used to attach a DSLR camera. It will require a 48
mm āwide T-ringā for your make of DSLR to connect to the adapter.
If you are using an astronomical camera with a smaller than āfull frameā (43 mm diagonal)
sensor, you may also be able to use the supplied M48 camera adapter. This likely will require
utilizing optional adapters, such as an M48-to-M42 adapter along with M48 extension rings,
to connect your camera and place your cameraās sensor at the proper backfocus distance.
The backfocus distance when using the M48 adapter is 55 mm.
Cameras with larger sensors will require a custom camera adapter to best illuminate the sen-
sor. Refer to the āCamera Adapter Requirementsā drawing on Celestronās website, located on the
36 cm Rowe-Ackermann Schmidt Astrograph webpage under the āSupport and Downloadsā
tab, to determine the design needed for your camera.
Note: Due to the steep light cone provided by the f/2.2 optical system, camera housings
can be a source of vignetting. Despite the astrograph having a large illuminated ļ¬ eld,
vignetting can occur with large sensor cameras when the sensor is deeply recessed within
the camera body. This is common with full-frame DSLR sensors.
To attach your camera:
1. Place the knurled retaining ring over the camera adapter and loosely thread it onto the lens
group housing. The Teļ¬ on washer goes between the retaining ring and the camera adapter.
2. Thread the camera body onto the camera adapter.
3. Carefully hold hold the camera so the camera adapter seats ļ¬ atly against the lens group housing.
4. Finish threading the retaining ring onto the lens group housing. Rotate the ring
until the camera adapter is snug against the housing. Do not over tighten! Camera
orientation can be adjusted later.
Caution:
Overtightening the retaining ring can cause the lens assembly to rotate
rela-
tive to the Schmidt corrector. Keep the camera adapter snug against the lens cell, but
do not overtighten the ring.
Adjusting Camera Orientation
Once the camera is installed, you can adjust its orientation by slightly loosening the retaining
ring. Loosen the ring no more than 1/8th turn, rotate the camera as desired, and retighten the
ring. Remember not to overtighten the ring.
Knurled
retaining
ring
1
3 4
2
5
7
6
8
Overview
1 Lens group 7 Cooling fan
2 Schmidt corrector 8 12V DC jack for cooling fan
3 Lens group housing 9 M48 camera adapter
4 Dovetail mounting rail Retaining ring with teļ¬ on washer10
5 Dovetail accessory rail 11 8 x AA battery pack (batteries not included)
6 Focus knob
The 36 cm Rowe-Ackermann Schmidt Astrograph (RASA 36 cm) delivers a ļ¬ at ļ¬ eld with no coma or astigmatism across a large (60 mm) image circle and extended spectral range
(400-900 nm). The astrograph can only be used with a camera.
3 | ENGLI SH
Cooling Down and Fan Operation
Optical performance of the RASA 36 cm will be best when it has reached thermal
equilibrium with the outside air. The greater the temperature difference between the
astrograph and the outdoors, the longer it will take to cool down. It is a good idea to store
the astrograph in a cool area, and to keep it outside for an hour or so before imaging.
The RASA 36 cm rear cell is equipped with a cooling system containing a fan to facilitate
cooling the optics to the ambient temperature. The fan pulls air through the mesh vents
located on the perimeter of the rear cell. The mesh prevents dust from entering the
astrograph. The supplied battery pack powers the fan. It requires 8x AA batteries (not
included). Install the batteries as indicated in the plastic mold of the battery holder. Plug
the battery pack into the jack near the fan to turn it on. When the optics have cooled down
and you are ready to image, unplug the battery pack to turn the fan off.
Focusing
The focuser moves the primary mirror within the rear cell. The RASA 36 cm V2 uses the
Ultra-Stable Focus System (USFS) that minimizes unwanted shifting of the primary mirror
when focusing and during long exposures.
To focus, turn the focus knob until the image appears sharp in your camera. If the knob
will no longer turn, the focuser has reached the end of its travel. In this case, rotate the
knob in the opposite direction until focus is achieved. If you turn the focus knob too
quickly, you may go right through focus without seeing the image. To avoid this problem,
try ļ¬ rst focusing on a bright star so the image is visible even when out of focus.
An essential accessory youāll likely want to add is a focus motor. The Celestron Focus
Motor is fully compatible with the RASA 36 cm V2. Please visit the focus motor webpage
at celestron.com for more information.
Attaching Accessories
The RASA 36 cm includes a CGE dovetail accessory rail that is also compatible with most
accessories which work on Losmandy-D plates. The dovetail accessory rail can be used to
mount an optional guidescope.
A Celestron ļ¬ ndescope can be attached using the pairs of threaded holes in the rear cell of
the astrograph. These holes have Phillips-head screws in them when not in use.
Mounting
holes for
ļ¬ nderscope
Removing the Optical Window
If using a ļ¬ lter somewhere in the light path, or if the camera has an optical window, we
recommend that you remove the optical window in the front lens cell. This will maintain
the best optical performance of the astrograph. The optical window utilizes M110 x 0.75
threads on the exterior of its housing.
To remove the optical window:
1. With the camera and camera adapter removed, carefully grab hold of the knurled cell
of the optical window.
2. Carefully unthread and remove the optical window.
Knurled cell of
optical window
Dew Prevention
The Schmidt corrector is especially susceptible to condensation forming because the glass is
exposed to the outside air. If the temperature of the astrograph drops below the dew point,
dew may form on the corrector within minutes. The easiest way to prevent dew is to add an
optional 14ā dew shield which shrouds and insulates the corrector. If conditions are more
severe, a dew heater can be added to apply slight heat to the corrector lens to keep it
dry all night.
Celestron has a full suite of dew prevention products that are fully compatible with the RASA
36 cm. Visit celestron.com for more information.
Do not store the astrograph if covered in dew. Allow it to dry ļ¬ rst without the dust cover on.
Storing optics when wet promotes mold growth on the optical surfaces.
Cleaning of the Optics
Dust, debris, and ļ¬ ngerprints on the optics will generally have little effect on imaging with the
RASA 36 cm. However, if the external surfaces of the Schmidt corrector and the lens group
become excessively dirty, they should be cleaned. Dust can be removed with a blower bulb or
a camel hair brush. Then, use optical cleaning solution and lens cleaning tissue to remove any
remaining debris or stains. Apply the solution to the tissue and then apply the tissue to the lens.
Low pressure strokes should go from the center of the corrector to the outer edge. Use a new
tissue for each stroke so as not to spread any oils or debris. Do not rub in circles.
You can use a commercially made lens cleaning solution or mix your own. A good cleaning
solution is isopropyl alcohol (99% pure) mixed with distilled water. The solution should be 3
parts isopropyl alcohol and 2 parts distilled water. You can also use soft white tissue instead of
lens cleaning tissue, as long it doesnāt have added lotions or perfumes.
To minimize the need to clean your astrograph, replace the dust cap once you have
ļ¬ nished using it.
Cleaning the internal optical surfaces should only be done by the Celestron repair department.
If your RASA 36 cm needs internal cleaning, please contact Celestron at celestron.com/pages/
technical-support for a return authorization number and price quote.
Collimation
The RASA 36 cm optics are factory aligned, and should not normally need collimation
adjustments. However, adjustments can be made to the tilt of the lens assembly, if needed,
to collimate the entire optical system. The primary mirror and corrector are permanently
aligned at the factory, and cannot be adjusted.
The astrograph must be collimated with a camera installed. Using a camera that does not
obstruct the light path (i.e. the aperture of the Schmidt corrector) is recommended, as this
makes it easier to see concentricity when stars are defocused.
Equipment needed:
2 mm Hex key
3 mm Hex key
Mount and camera setup, ready to image
1. Install the camera on the astrograph.
2. Slightly loosen the retaining ring and rotate the camera adapter so the three slotted
openings allow access to the collimation screws. Retighten the retaining ring.
Collimation
screws
Produktspezifikationen
| Marke: | Celestron |
| Kategorie: | Teleskop |
| Modell: | Astro Fi 102 |
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