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Opticstar ARC127 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 ARC127 Optical Tube Assembly (OTA).
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- 127mm Refractor
- Focal length: 1200mm
- Focal ratio: F/9.5
- 8x50mm 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 ARC127 Optical Tube Assembly (OTA)
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Outline
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The Opticstar ARC-127 is a 127mm aperture F9.5 achromatic refractor with high quality optics that is ideal
for planetary, Lunar and Solar observing with an appropriate Solar filter. Its relatively large aperture
also makes it suitable for deep sky work to a degree.
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Optical Design
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The Opticstar ARC-127 telescope uses an objective consisting of two Low Dispersion (LD) Crown/Flint lenses,
the lenses are broadband anti-reflection multi-coated for increased contrast and sharpness. The LD objective
in conjunction with a long focal ratio restrains optical/chromatic aberrations in general and making the
telescope well suited for high power work.
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Opticstar ARC127.
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Construction
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A high quality optical tube keeps the optics precisely aligned allowing for heavy optical equipment to be
attached at the focuser end. The optical tube has been internally anti-reflection coated and greatly
benefits from knife-edge baffles that prevet stray light from reaching the focal plane thus significantly
increasing image contrast and sharpness. In addition, 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 draw tube has a printed millimetre scale to aid with focusing
and repositioning, in addition the focuser has brass compression rings to better scure 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. 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 single–piece cradle with a carry-handle is used to lift and support the telescope on its mount.
The telescope has a Vixen/Skywatcher type dovetail with a steel plate and will mount on most astronomical
mounts including the Opticstar EQ1300 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 costs, telescope total weight and the need for a heavier mount.
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Collimation
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The ARC-127 comes collimated from the factory. If there was a need the objective could be
collimated by an experienced user, three sets of easily accessible screws allow for precise collimation.
Collimation can take place on a star under good atmospheric conditions or with the use of an
artificial star like the Opticstar Artificial Star XL.
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Accessories
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The ARC-127 comes with a 8x50mm finder scope and bracket. A 1.25" star diagonal and a 25mm Plossl eyepiece
are also included. An optional 13% transparency Moon filter is recommended as is a 4mm-5mm eyepiece for
high power viewing.
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Bundled accessories.
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Specification
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| Model |
Opticstar ARC127 |
| Aperture |
127mm |
| Focal ratio |
F/9.5 |
| Focal length |
1200mm |
| 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 |
7.5kg (inc. rings) |
| Tube length |
1240mm |
| Eyepieces |
Plossl 1.25" 25mm |
| Magnification |
With bundled eyepiece:
With optional eyepieces:
- w/9mm eyepiece x133;
- w/6mm eyepiece x200;
- w/9mm eyepiece and x2 barlow lens x266; (maximum practical magnification)
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| Star diagonal |
1.25"; 90° |
| Finderscope |
8x50mm with bracket |
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Opticstar ARC Series Refractor Optical Tube Assemblies
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Model |
Aperture |
Focal Ratio |
Focal Length |
Optical
Design |
User Manual |
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ARC127 |
127mm |
F/9.5 |
1,200mm |
Achromatic doublet |
ARC127 OTA (PDF) |
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ARC152 |
152mm |
F/7.9 |
1,200mm |
Achromatic doublet |
ARC152 OTA (PDF) |
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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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