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Opticstar ARC102S Optical Tube Assembly (OTA)
Compact Quality Refractor
To order this item outside mainland Britain or Highlands, please contact us.
Opticstar ARC102S Optical Tube Assembly
Opticstar ARC102S Optical Tube Assembly (OTA).
  • 102mm Refractor
  • Focal length: 673mm
  • Focal ratio: F/6.6
  • 6x30mm Finder scope
  • Mounting tube rings and dovetail bar
  • 25mm Plossl eyepiece (1.25")
  • Star Diagonal (1.25")
Opticstar Visual
Opticstar Mount
CCD Cameras
Opticstar ARC102S Optical Tube Assembly (OTA)
Package includes:
  • Opticstar ARC102S refractor optical tube assembly.
  • Mounting tube rings and dovetail bar.
  • 6x30mm Finder Scope.
  • 1.25" 25mm Plossl Eyepiece.
  • 1.25" Star Diagonal.
  • Free options (please select one):
    • FREE: Opticstar 1.25" Moon Filter with 25% 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.
Order No. Price (inc_VAT) Shipping Delivery click button to purchase
OSRA10S £ £
Opticstar ARC102S OTA
User Manual (PDF)
Opticstar CCD Cameras

The Opticstar ARC-102S is a 102mm aperture F/6.6 achromatic refractor with high quality optics that is ideal for general use. The ARC-102S can be used for planetary, Lunar and Solar observing with an appropriate Solar filter as well as for deep sky and terrestrial observation due to its wide field of view.

Optical Design
The ARC-102S uses a high quality objective consisting of two Low Dispersion (LD) Crown/Flint lenses, the lenses are fully anti-reflection multi-coated for increased contrast and sharpness. The LD objective in conjunction with a shorter focal ratio makes the telescope well suited for wide field deep sky and terrestrial viewing and imaging.

Opticstar ARC102S Optical Tube Assembly

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.

The ARC-102S comes with a 6x30mm finder scope and bracket. A 1.25" diagonal, and 25mm Plossl eyepieces are also included. Optionally a 25% transparency Moon filter is recommended as is a 3.5-4mm eyepiece for high power viewing. For terrestrial observation an optional prism diagonal is required.

Bundled accessories.
Bundled accessories.
Model Opticstar ARC102S
Aperture 102mm
Focal ratio F/6.6
Focal length 673mm
Objective Achromatic doublet
Optical coatings Anti-reflection coated
Optical tube Internally anti-reflection coated
Dew shield Yes
Finderscope saddle Yes
Focuser type Rack & Pinion
Focuser 2" with 1.25" adapter (T-threaded for camera use)
Tube rings Dual rings with carrying handle and dovetail platform
Tube weight 4kg (inc. rings)
Tube length 680mm
Eyepieces Plossl 1.25" 25mm
Magnification With bundled eyepiece:
  • w/25mm eyepiece x25.
With optional eyepieces and/or barlow lenses:
  • w/9mm eyepiece x75;
  • w/6mm eyepiece x122;
  • w/9mm eyepiece and x2 barlow lens x150;
  • w/4mm eyepiece x168; (maximum practical magnification)
Star diagonal 1.25"; 90°
Finderscope 6x30mm with bracket

Opticstar ARC Series Refractor Optical Tube Assemblies
Model Aperture Focal Ratio Focal Length Optical
User Manual
Opticstar ARC90 Optical Tube Assembly ARC90 90mm F/10 900mm Achromatic doublet ARC90 OTA (PDF)
Opticstar ARC102S Optical Tube Assembly ARC102S 102mm F/6.6 673mm Achromatic doublet ARC102S OTA (PDF)
Opticstar ARC102 Optical Tube Assembly ARC102 102mm F/9.8 1,000mm Achromatic doublet ARC102 OTA (PDF)
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 M31 galaxy shot by Peter Shah 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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