Takahashi FOA60-K Bedienungsanleitung
Instruction Manual
TAKAHASHI
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Thank you very much for your purchase of the TAKAHASHI FOA-60
Fluorite Ortho Apochromat. This telescope is a doublet apochromat
with ideally positioned lenses: one fluorite lens, and another new
lens used by Takahashi for the very rst time in this telescope. This
combination has achieved a delicate correction of the spherical
aberration, and can produce images with almost no color aberration.
In addition, this telescope offers a wide variety of observing
applications with the flatteners and extenders optionally available
from Takahashi. In order to use your telescope to its highest
possible capabilities, please read this instruction manual very
carefully and familiarize yourself with all of the functions that your
telescope oers.
All telescopes have been strictly inspected before shipment. If there
is anything wrong with your telescope when unpacked, please
contact your authorized Takahashi distributor for proper care.
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WARNING
CAUTION
WHEN THE TELESCOPE IS DIRECTED TO
THE SUN, ITS LIGHT AND HEAT ARE BOTH
INTENSE AND DANGEROUS. NEVER TRY
TO VIEW THE SUN. DOING SO WITHOUT
PROPER EQUIPMENT MAY CAUSE
PERMANENT BLINDNESS.
DANGER
◆ When attaching the telescope on the mount, take care not to
drop it or to be pinched, causing unexpected injuries.
◆ Never place the telescope on uneven place to prevent it from
falling or dropping, which might cause injuries.
◆ Do not place the telescope in direct sun light. The light
concentrated at the focal point is so intense that it might cause
a re.
◆When focusing the telescope, be careful not to pinch your
nger.
◆ Be careful that children do not swallow small parts such as
button battery, eyepiece, etc.
◆ Flammable materials such as Styrofoam are used for packing
material. Do not place it near a re. Keep children away from
the large vinyl bag to avoid risk of suocation.
Warning & Caution
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Table of Contents
Warning & Caution ----------------------------------------- 3
Table of Contents ------------------------------------------ 4
Specications ----------------------------------------------- 5
Tube Assembly Layout ----------------------------------- 6
Set Up Procedures ---------------------------------------- 7
Focusing ----------------------------------------------------- 10
Finder Adjustment ---------------------------------------- 11
Observation ------------------------------------------------ 12
Accessories ------------------------------------------------ 13
What is Fluorite? ------------------------------------------ 19
Care & Maintenance ------------------------------------- 20
Additional Precautions ----------------------------------- 20
System Charts --------------------------------------------- 21
Version 1.01
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Specications
Conguration --------------------------- Fluorite Ortho Apochromat Doublet
Eective Aperture --------------------- 60mm all surfaces hard-multi-coated
Eective Focal Length --------------- 530mm
Eective Focal Ratio ----------------- 1:8.8
Resolving Power ---------------------- 1.93”
Limiting Magnitude ------------------- 10.7
Light Gathering Power --------------- 73X
With Flattener 0.93×
Eective Focal Length ------------- 495mm
Eective Focal Ratio ---------------- 1:8.2
Image Circle -------------------------- φ44mm
With Extender 1.7XR
Eective Focal Length ------------- 900mm
Eective Focal Ratio ---------------- 1:15.0
Image Circle -------------------------- φ44mm (100% illuminated)
φ88mm (reference)
Diameter of Main Tube -------------- 68mm
Total Length of Tube Assembly ---- 570mm
Weight of Main Tube Assembly ---- 1.8kg (about 3.6lbs)
Finder Scope --------------------------- 6x30 (optional)
Accessories ---------------------------- Warranty card, Instruction Manual,
Hex wrench (4mm)
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Tube Assembly Layout
Dew Shield Cap
Dew Shield Lock Screw
Dew Shield
Main Tube
6x30 Finder Scope
Focuser Housing
Drawtube Clamp
Finder Bracket
Focusing Knob
50.8(2") AD Ring (FOA-60)
Drawtube
50.8(2”) Adapter (SKY-90)
50.8(2”) Extension Tube L
50.8(2”) Sleeve
Coupling S
Eyepiece Adapter Cap 31.7(1¼”) Eyepiece Adapter
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Set Up Procedures
Hex Wrench
(4mm)
Finder Bracket
Finder Base
Cap Bolt
Washer
Focuser Unit
Finder Bracket
Finder Adjusting Screw
Lock Nut
Lock Screw
6x30 Finder Scope
Groove
◆Attaching the Finder Bracket
Place the finder bracket leg on the finder
base on the main tube and lock it firmly
with two cap-bolts, using 4mm hex wrench
provided. Set the nder scope so that it is as
parallel to the main tube as possible. Failure
to do so can make alignment dicult.
◆Setting the Telescope on the Mount
Set the tube holder on the tube holder base
with two cap-bolts, and then place the tube
assembly on the tube holder and lock the
tube holder with the clamp after balancing
the tube assembly. The tube holder can be
used with all Takahashi mounts. If using this
equipment for astro-imaging, the heavier
duty the mount, the better.
Tube Holder
Tube Holder Base
Equatorial Mount
Tube Holder
Clamp
Cap Bolt
Hex Wrench (6mm)
◆Attaching the Finder Scope
As illustrated at the bottom, insert the
nder
into the bracket so that the nder lock
screw
presses into the finder scope at the
groove. Set the finder scope in the center
of the bracket and lock it with the adjusting
screws and lock screws. Attach the finder
to a position as parallel to the main tube as
possible.
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◆Balancing
Now that the telescope has been attached
to the mount, it is necessary to balance
the load in the R.A. and the Dec. When
unbalanced, the clamps and the gearing of
the motor drive do not work properly.
▼Balancing the Dec.
1. Unclamp the R.A. and lock it when the
Dec. axis becomes horizontal. If the R.A.
is greatly out of balance and does not
rotate smoothly, rst do a rough balance
of the R.A.
2. Be careful that the package does not
move abruptly. Hold onto the telescope,
and loosen the Dec. clamp to adjust
balance.
3. If it does not, loosen the tube holder and
move the tube assembly forward and
backward until it balances. Then, lock
the tube holder. Especially when imaging
package is attached, set the tube
assembly at proper position.
▼Balancing in the R.A.
1. When the Dec. axis is balanced, lock it
rmly with the Dec. clamp.
2. Loosen the R.A. clamp and check
balance of the R.A.
3. If unbalanced, move the counter-
weight(s) until the R.A. is balanced and
lock it.
4. If still unbalanced with the weight fully
extended, add extra weight.
◆Retractable Dew Shield
The dew shield of the FOA-60 is retractable.
To transport, it can be retracted and when
observing, it can be extended to stop stray
light coming into the tube. To extend the
dew shield, follow the instructions below:
1. Remove the dew shield cap.
2. Loosen the lock screw.
3. Draw out the dew shield.
4. Tighten the lock screw.
(Note)
When you retract the dew shield, be sure to
remove the dew shield cap rst. Otherwise,
the cap may be forced o.
Dew Shield Lock Screw
Dew Shield Cap
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◆Attaching an Eyepiece
Remove the eyepiece adapter cap and
loosen the compression ring by turning it
counter-clockwise. Then, insert a desired
eyepiece or 31.7mm(1¼”) diagonal prism
into
the adapter, and tighten the compression
ring by turning it clockwise.
◆Takahashi Eyepiece
A wide variation of eyepieces are available
from Takahashi.
▼LE Series
Standard type, wide view field and high
magnication range available in:
・31.7mm (1¼”) barrel
LE5mm - 30mm
・50.8mm (2”) barrel
LE40mm & 50mm
◆Attaching Accessories
Adapters and rings are attached on the visual back to attach various accessories. Please
check the system charts and attach the desired accessories correctly. Standard connection
is as follows.
▼TAK-UW Series
Ultra-wide angle with apparent field of 90
degrees designed to get sharpest star
images with a at eld telescope, available
in:
・31.7mm (1¼”) barrel
TAK-3.3UW - 10UW
▼Abbe Series
Simple 2-group 4-element eyepiece with
high contrast, less expensive with high
performance, available in:
・31.7mm (1¼”) barrel
Abbe 4mm - 32mm
▼Ere
With 3-group 5-element optics, 60 degree
apparent field of view, almost no flare and
ghost, available in:
・31.7mm (1¼”) barrel
Er-28mm
Compression Ring
Plastic Ring
Eyepiece
50.8(2”) Extension Tube L
50.8(2”)Sleeve
Coupling S
31.7(1¼”) Eyepiece Adapter
Eyepiece
M55.9x0.75 50.8mm (2”) 50.8mm (2”)
M43x0.75
M36.5x1.0 31.7mm (1¼”)
50.8(2”) Adapter (SKY90)
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Focusing
◆Focusing System
The FOA-60 uses a rack-and-pinion focuser.
This focuser enables the observer to focus
rapidly. Turning the focusing knob clockwise
will move the drawtube out, while turning it
counter-clockwise will move the drawtube
in.
Af t er in s erti n g an ey e p iec e i nto th e
telescope, it is necessary to achieve
the best possible focus. Remember that
the atmosphere will limit the highest
magnification that can be used on any
given night. Using the lowest power
eyepiece, focus the image and increase
the magnification by using shorter and
shorter focal length eyepieces until the
desired magnification is reached. This
procedure allows the centering of an object
at high magnification. Please familiarize
yourself with the following items so that
you can always get the best focus in your
observation.
Drawtube
Drawtube Clamp
Focusing Knob
Drawtube will be moved out by
turning the knob this direction.
◆Focusing Process
Remove the dew shield cap and the
eyepiece adapter cap. Insert the diagonal
prism into the compression ring adapter.
Carefully tighten the compression ring until
it begins to make contact with the barrel
of the diagonal prism. It is not necessary
to overtighten the ring to hold the diagonal
prism.Then insert the eyepiece into the
compression ring of the diagonal prism,
repeating previous process. Be careful not
to overtighten the compression ring.
Begin the focusing process by choosing a
bright star in a convenient position of the
sky. When you think that you have achieved
the best focus, move the focuser inside and
outside of what you think is the best focus.
This will conrm the critical procedure.
Begin with a low power eyepiece and then
proceed higher and higher until the desired
magnication has been achieved.
When the best focus at high magnification
has been achieved, the observer may notice
a bright and dim ring around the star. This is
not a defect but rather a diffraction pattern
which is an indication of the diffraction
limited optics.
◆Drawtube Clamp
The drawtube clamp is provided to lock the
drawtube when the best focus is achieved.
In visual observation, clamping the drawtube
is not necessary, but in astro-imaging, the
drawtube will move when a heavy package
is attached so it is necessary to firmly
clamp the focuser to keep the package from
moving and spoiling the image. Don't forget
to loosen the clamp when finished to help
prevent damage to the gears.
Dieses Handbuch passt für folgende Modelle
1
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