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Opticstar ARC102 Optical Tube Assembly (OTA)
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Quality Refractor
To order this item outside mainland Britain or Highlands, please contact us.
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Opticstar ARC102 Optical Tube Assembly (OTA).
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- 102mm Refractor
- Focal length: 1000mm
- Focal ratio: F/9.8
- 6x30mm Finder scope
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- Mounting tube rings and dovetail bar
- 25mm Plossl eyepiece (1.25")
- Star Diagonal (1.25")
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Opticstar ARC102 Optical Tube Assembly (OTA)
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Outline
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The Opticstar ARC-102 is a 102mm aperture F9.8 achromatic refractor with high quality optics that is
ideal for planetary, Lunar and Solar observing with an appropriate Solar filter. The ARC-102S can also
be used for high power terrestrial observation.
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Optical Design
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The ARC-102 uses a high quality objective consisting of two Low Dispersion (LD) Crown/Flint lenses,
the lenses are fully anti-reflection coated for increased contrast and sharpness. The LD objective
in conjunction with a long focal ratio restrains chromatic aberrations making the telescope well
suited for high powers.
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Opticstar ARC102.
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Construction
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The optical tube has been internally anti-reflection coated and benefits from knife-edge baffles in the
focuser tube that reduce stray light from reaching the focal plane thus increasing image contrast and
sharpness. The optical tube assembly has a dew shield that also protects the lenses from condensation
forming on the objective when the telescope is used in unfavourable conditions.
The telescope’s 2" rack & pinion focuser has a millimetre scale to aid with focusing and repositioning,
in addition the focuser has brass compression rings to better secure and not scratch accessories. It comes
with a 1.25" eyepiece adapter so it will accommodate both 2" and 1.25" eyepieces and other accessories.
In addition the 1.25" adapter has a T-thread on its end that will enable the use of T-threaded Accessories
including DSLR cameras, filter-wheels etc. A high quality single–piece cradle with a carry-handle is used to
lift and mount the telescope.
The telescope has a Vixen/Skywatcher type dovetail and will mount on most
astronomical mounts including the Opticstar EQ700 and EQ13000 GT. The carry-handle has been designed so as
to enable the user to attach a DSLR, guide-scope or other accessories without the need of side by side
platforms or similar, thus reducing the total weight, cost and possibly the need for a heavier mount.
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Accessories
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The ARC-102 comes with a 6x30mm finder scope and bracket. A 1.25" diagonal, and 25mm Plossl eyepieces are also included.
A 25% transparency Moon filter is recommended as is a 5mm-6mm eyepiece for higher power viewing. For terrestrial
observation an optional prism diagonal is required.
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Bundled accessories.
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Specification
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| Model |
Opticstar ARC102 |
| Aperture |
102mm |
| Focal ratio |
F/9.8 |
| Focal length |
1000mm |
| Objective |
Achromatic doublet |
| Optical coatings |
Anti-reflection coated |
| Optical tube |
Internally anti-reflection coated |
| Dew shield |
Yes |
| Finderscope saddle |
Yes |
| Focuser type |
Rack & Pinion with lock, baffled for increased contrast |
| Focuser |
2" with 1.25" adapter (T-threaded for camera use) |
| Tube rings |
Dual rings with carrying handle and dovetail platform |
| Tube weight |
4.5kg (inc. rings) |
| Tube length |
1030mm |
| Eyepieces |
Plossl 1.25" 25mm |
| Magnification |
With bundled eyepiece:
With optional eyepieces:
- w/9mm eyepiece x111;
- w/6mm eyepiece x167; (maximum practical magnification)
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| Star diagonal |
1.25"; 90° |
| Finderscope |
6x30mm with bracket |
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Opticstar ARC Series Refractor Optical Tube Assemblies
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Opticstar ARC Series Refractor Optical Tube Assemblies
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Opticstar ARC QUAD Series Astrograph Refractor Optical Tube Assemblies
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Opticstar ARC QUAD Series Astrograph Refractor Optical Tube Assemblies
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Notice
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We are constantly checking the accuracy of the technical data. We are prepared
to provide more detailed information on request. Technical data is subject to
change without notice.
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