© Opticstar Ltd 2014
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Introduction
Congratulations on the purchase of your Opticstar ARC-152 achromatic refractor. The ARC-152 telescope is very
well suited for astronomical observation. Its fully coated achromatic optics, solid construction, metal knife-edge
baffles and long focal length make it ideal for high power viewing in general and for the Moon, planets and Sun in
particular (with an appropriate Solar filter).
Please read through the manual to familiarise yourself with the telescope so that you can get the most out of the
equipment. This manual details the setting up, operation, specification and optional accessories of the Opticstar
ARC-152 telescope.
Parts
The Opticstar ARC-152 telescope package consists of the following:
1. Optical Tube with rings and dovetail.
2. Finder scope with Bracket
3. 1.25” Star Diagonal
4. 25mm Plossl eyepiece
5. This Manual
Mounting the Telescope
The telescope is fitted with a Vixen type dovetail platform and will mount on most telescope mounts including the
Opticstar EQ700 and Opticstar EQ1300 GT computerised mount.
The telescope can be mounted as is on an extra heavy duty photographic tripod with a heavy photographic thread.
Heavy heads will work adequately at low magnifications, an extra heavy duty geared head with slow-motion
controls is required for higher magnifications or when fine control is required.
Finder-scope Assembly and Alignment
To assemble the finder-scope place the finder-scope optical tube
in the supplied bracket and lightly tighten the six thumbscrews
enough to secure the finder-scope optical tube in place as in the
picture on the right.
Please note that two of the six thumb
screws are spring loaded. Once you set the spring loaded screws
to the desired position you would only need to adjust the four
remaining thumb screws to align the finder scope as outlined in
the following page.
Once Mount the assembled finder-scope to the telescope and
secure it in place. Attach the telescope to a mount/tripod.
The finder scope has been focused at infinity at the factory. If there was a need to refocus the finder scope you can
do so as follows:
1. Dismount the finder scope form the telescope and remove it
from its bracket.
2. Release the Locking Ring by turning it several times.
3. Point the finder scope to your target i.e. star at ‘infinity’.
4. Turn the Objective Cell to bring the star in sharp focus.
5. Secure the Objective Cell position by tightening the Locking
Ring against it.
6. Re-assemble and mount the finder scope to the telescope.
Locking
Ring
Objective Cell
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