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Opticstar ARC127 Optical Tube Assembly (OTA)
Quality Refractor
To order this item outside mainland Britain or Highlands, please contact us.
Opticstar ARC127 Optical Tube Assembly
Opticstar ARC127 Optical Tube Assembly (OTA).
  • 127mm Refractor
  • Focal length: 1200mm
  • Focal ratio: F/9.5
  • 8x50mm Finder scope
  • Mounting tube rings and dovetail bar
  • 25mm Plossl eyepiece (1.25")
  • Star Diagonal (1.25")
Opticstar Visual
Opticstar Mount
CCD Cameras
Opticstar ARC127 Optical Tube Assembly (OTA)
Package includes:
  • Opticstar ARC127 refractor optical tube assembly.
  • Mounting tube rings and dovetail bar.
  • 8x50mm Finder Scope.
  • 1.25" 25mm Plossl Eyepiece.
  • 1.25" Star Diagonal.
  • Free options (please select one):
    • FREE: Opticstar 1.25" Moon Filter with 13% light transmission. Reduces the glare of the Moon. (R.R.P.: £9.95).
    • FREE: Red LED Torch made of aluminium alloy. Helps to preserve your night vision. (R.R.P.: £9.95).
  • OFFER: Please refer to the right hand column on this page.
Opticstar 1.25" Moon Filter 25% transmission. + £11.95
Red LED Torch (aluminium alloy construction). + £9.95
Opticstar 1.25" 9mm Wide Angle eyepiece. + £19.95
Opticstar 1.25" 6mm Wide Angle eyepiece. + £19.95
FREE Options & Offers (please select one)
Opticstar 1.25" Moon Filter 25% transmission. £0.00
Red LED Torch (aluminium alloy construction). £0.00
Order No. Price (inc_VAT) Shipping Delivery click button to purchase
OSRA12L £ 245.00 £ 10.00
Opticstar ARC127 OTA
User Manual (PDF)
Opticstar CCD Cameras

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.

Optical Design
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.

Opticstar ARC127 Optical Tube Assembly
Opticstar ARC127.

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.

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.

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.

Bundled accessories.
Bundled accessories.
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:
  • w/25mm eyepiece x48.
With optional eyepieces:
  • w/9mm eyepiece x133;
  • w/6mm eyepiece x200;
  • w/9mm eyepiece and x2 barlow lens x266; (maximum practical magnification)
Star diagonal 1.25"; 90°
Finderscope 8x50mm with bracket

Opticstar ARC Series Refractor Optical Tube Assemblies
Model Aperture Focal Ratio Focal Length Optical
User Manual
Opticstar ARC127 Optical Tube Assembly ARC127 127mm F/9.5 1,200mm Achromatic doublet ARC127 OTA (PDF)
Opticstar ARC152 Optical Tube Assembly ARC152 152mm F/7.9 1,200mm Achromatic doublet ARC152 OTA (PDF)
Opticstar ARC Series Refractor Optical Tube Assemblies

Opticstar ARC QUAD Series Astrograph Refractor Optical Tube Assemblies
Model Aperture Focal Ratio Focal Length Optical
User Manual
Opticstar ARC127 Optical Tube Assembly ARC127 QUAD 127mm F/4.9 622mm Achromatic quadruplet ARC127 QUAD OTA (PDF)
Opticstar ARC152 Optical Tube Assembly ARC152 QUAD 152mm F/5 760mm Achromatic quadruplet ARC152 QUAD OTA (PDF)
Opticstar ARC QUAD Series Astrograph Refractor Optical Tube Assemblies

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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Promotional Offer
Cash Back on Opticstar
Imaging Products
updated: 8th September 2017
Opticstar cashback offer.

Customers who purchase any Opticstar telescopes, Opticstar optical tubes or Opticstar mounts listed on this page qualify for a 10% cash back on any Opticstar astronomy cameras purchased at the same time or at a later date.

This offer is valid for 1 year commencing on the date that the Opticstar product is purchased from the Opticstar website or the Opticstar showroom.

Any additional purchases at a later date of Opticstar products that qualify for this offer will renew the cash back period to 1 full year.

Opticstar astronomy cameras that qualify for this offer include the following: Once an Opticstar CCD or CMOS camera has been purchased within a year of the qualifying Opticstar purchase, the cash back can be claimed by contacting Opticstar by email or over the phone quoting the receipt number(s). Please allow up to 14 days to process the payment.

Sample Images
Opticstar DS-145M ICE
posted: 13th March 2009
Sample image.
The NGC7293 shot by John Haunton with the Opticstar DS-145M ICE.
We want to hear your comments.
Sample Images
Opticstar DS-335C ICE
updated: 20th August 2010
Sample image.
The Trifid nebula shot by John Haunton with the Opticstar DS-335C ICE.
Opticstar Imaging
posted: 26th February 2013
Opticstar telescopes for imaging.
High quality refractor telescopes, bundled with CCD cameras for deepd sky imaging, planetary video imaging and auto-guiding.
A&M 80mm f/6 Review
"Best Of Breed"
updated: 25th March 2009
A&M 80mm f/6 A&M/TMB.
The A&M 80mm f/6 A&M/TMB has been reviewed in Cloudy Nights and it has been hailed as the "best of breed". The review concludes by saying "offers stunning performance while standing out from the crowd, look no further".
Willmann Bell
Books for Astronomy
updated: 20th September 2019
Willman Bell books.
Acclaimed books from Willmann Bell...
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