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Opticstar ARX200 f/3.9 Flat-Field Astrograph
Flat-Field Corrected Reflector - Widefield Instrument
To order this item outside mainland Britain or Highlands, please contact us.
Opticstar ARX200 Flat-Field Astrograph
  • Optical Design: Reflector
  • Aperture: 203mm (8")
  • Focal Length: 790mm (f/3.9)
  • Variable Flat Field Coma Corrector
  • Precision Micro Adjustable Collimation
  • 2" Dual-Speed 10:1 Precision Crayford type focuser
  • Tube rings and dovetail bar (Vixen / Sky-Watcher type)
  • Illuminated 8x50mm Finderscope
  • Carbon Fibre tube
  • Weight: 8.1 kg
Mount not included. Shown for illustration only.
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Opticstar ARX200 f/3.9 Flat-Field Astrograph
Package includes:
  • Opticstar ARX200 203mm F/3.9 optical tube assembly (OTA).
  • Variable Flat-Field Coma Corrector
  • Illuminated Finder Scope 8x50mm.
  • Mounting Rings and Dovetail bar (Vixen style).
  • 2" Dual-Speed 10:1 Precision Crayford type focuser.
  • FREE: Opticstar SL-131C COOLAIR planetary video camera. See options below.
Special Offers (please select one)
Opticstar SL-131C C.A. colour video camera (1/3" CMOS planetary). £0.00
Opticstar DS-616C XL 6MP TEC cooled camera (1.8" CCD deep sky). + £695.00
Order No. Price (inc_VAT) Shipping Delivery click button to purchase
OSRARXFF £ --- £ ---
Delivery information: Typically, this item is delivered within 4 business days.
Opticstar ARX200 User Manual
(PDF)
Opticstar CCD Cameras
(PDF)

Outline
The Opticstar ARX200 Astrograph is a wide/flat field imaging instrument that been designed for the purpose of astro-imaging and astrometry.

It can be used in conjunction with a camera to capture images of the same section of the sky over days or weeks apart for the purpose of discovering ‘new’ objects including novae, variable stars, asteroids, meteors and comets. Image data can then be compared to reveal changes in brightness, movement or new objects that have entered our Solar system.
Alternatively the instrument can be used to capture high quality flat-field images of the celestial objects and larger areas of sky in a relatively short period of time due to the instrument’s fast focal ratio of F3.9 and 203mm. aperture.

All optical elements in the optical train have been designed to function as a single optical system to achieve maximum performance. The distance between the corrector and the camera sensor can be set without the need of extension tubes and similar arrangements. A helical type mechanism is used to easily set the required distance.

The ARX200 optical tube is made of strong Carbon Fibre. Carbon fibre is a light-weight material that offers exceptional thermal stability when compared to metal.
Opticstar ARX200
The Coma Corrector is bundled with the ARX200 as standard.
This ensures that the focal plane will not ‘move’ over extended exposures and during long imaging sessions as the temperature drops over night. This results to sharper images showing higher contrast.

The ARX200 has with a 2” precision 10:1 dual speed Crayford type focuser with a 1.25” adapter. It comes with a Vixen/Skywatcher saddle and an 8x50mm finder scope. The finder scope mounting saddle will support larger scopes like the Opticstar Guidescope 60XL that can be used for auto-guiding.

Fast telescopes are difficult to collimate due to their fast focal ratios coupled with a need of excellent collimation when imaging. The Opticstar ARX200 innovates by ding without the crude collimation mechanisms found in other such instruments. Instead the ARX200 uses a precision micro focuser similar to those found in rifle scopes. This makes collimation quick, easy and accurate.

In addition the secondary mirror has blackened edges, this helps to increase contrast and image sharpness.

Opticstar ARX200.
Showing the micro-precision collimation mechanism.


Specification of Opticstar ARX200 Flat-Field Astrograph
Aperture 203mm
Focal length 790mm
Focal ratio f/3.9
Corrector 4-element, variable flat field coma corrector
Collimation Precision micro-adjustable
Secondary mirror Blackened edges
Tube Caron Fibre
Finderscope Saddle Vixen/Skywatcher type
Finder-scope Illuminated, 8x50mm
Focuser 2" Dual-Speed 10:1 Precision Crayford type focuser
Tube support Tube rings and mounting bar
Case Carry case for the optical tube and accessories
Eyepiece Plossl 1.25" 25mm eyepiece included
Tube length 79 cm
Tube diameter 27 cm
Tube weight 8.1 kg including mounting rings



Sample ARX200 Astrograph Images
Please click on the images below to expand to their full size.
Sample image. Sample image.
IC 434 Horse head & Flame Nebulae in Orion
Image by Gary Yule captured on 2018-02-26 from Manchester, England
Opticstar ARX200 8" f/3.9 Flat Field Astrograph
Sky-watcher EQ5 Pro
Nikon D5100 ISO 1000
Lumicon Deep Sky Filter
300 x 60 secs Lights
50 x Flats
50 x Darks
50 x Dark Flats
40 x Bias 1/4000
Stacked in DSS
Processed in Star Tools
Click image to enlarge

NGC 7635 Bubble Nebula in Cassiopeia
Image by Gary Yule captured on 2018-03-01 from Manchester, England
Opticstar ARX200 8" f/3.9 Flat Field Astrograph
Nikon D5100
LRGB total exposure x 130 minutes
L = 40 x 1min
R = 30 x 1min
G = 30 x 1min
B = 30 x 1min
Click image to enlarge

Sample image. Sample image.
M51 Spiral Galaxy in Canes Venatici.
Image by Gary Yule from Manchester, England.
Optictstar ARX200 8" f/3.9 Flat Field Astrograph
Sky-watcher EQ5 Pro
Nikon D5100 ISO 1600
Lumicon Deep Sky Filter
200 x 60secs Lights
50 x Flats
50 x Darks
50 x Dark Flats
30 x Bias 1/4000
Stacked in DSS
Processed in Star Tools
Click image to enlarge

M81 Bodes Nebula Spiral Galaxy in Ursa Major
Image by Gary Yule captured on 2018-02-17 from Manchester, England
Opticstar ARX200 8" f/3.9 Flat Field Astrograph
Sky-watcher EQ5 Pro
Nikon D5100 ISO 1600
Lumicon Deep Sky Filter Ha 92% Hbeta 88% Olll 82%
250 x 45secs
50 Darks
50 Flats
50 Dark Flats
30 Bias x 1/4000
Click image to enlarge

Sample image. Sample image.
M42 The Orion nebula under hazy conditions
Image by Gary Yule captured on 2018-02-13 from Manchester, England
Opticstar ARX200 8" f/3.9 Astrograph
Nikon D5100
ISO 1600
Lumicon Deep Sky Filter
150 x 1 min Lights
50 x 1 min Darks
40 x 1 min Dark Flats
40 x 1min Flats
30 x 1/4000 sec Bias
Stacked in DSS
Processed in Star Tools
Reprocessed with different colour settings and deconvolution and been cropped and slightly rotated
Click image to enlarge

M42 The Orion nebula under hazy conditions
Image by Gary Yule captured on 2018-03-13 from Manchester, England
Opticstar ARX200 8" f/3.9 Astrograph
Nikon D5100
ISO 1600
Lumicon Deep Sky Filter
150 x 1 min Lights
50 x 1 min Darks
40 x 1 min Dark Flats
40 x 1min Flats
30 x 1/4000 sec Bias
Stacked in DSS
Processed in Star Tools
Click image to enlarge

Sample image. Sample image.
M94 Spiral Galaxy in Canes Venatici
Image by Gary Yule captured on 2018-02-16 from Manchester, England
Opticstar ARX200 8" f/3.9 Flat Field Astrograph
Sky-watcher EQ5 Pro
Nikon D5100 ISO 1600
100 x 60 secs Lights
35 x Flats
35 x Darks
35 x Dark Flats
30 x Bias 1/4000
Stacked in DSS
Processed in Star Tools
Click image to enlarge

The Pleiades, M45 open star cluster
Image by Gary Yule captured on 2018-02-22 from Manchester, England
Opticstar ARX200 8" f/3.9 Flat Field Astrograph
Sky-watcher EQ5 Pro
Nikon D5100 ISO 1600
Lumicon Deep Sky Filter
60 X 45 secs Lights
20 x Flats
20 x Darks
20 x Dark Flats
15 x Bias 1/4000
Stacked DSS
Processed in Star Tools
Click image to enlarge

Sample image. Sample image.
M13 & NGC 6207
Image by Gary Yule captured on 2018-04-14 from Manchester, England
Opticstar ARX200 8" f/3.9 Astrograph
Opticstar f/3.9 corrector
Rowan Belt modded HEQ5
Nikon D5100
ISO 1600
Lumicon Deep Sky Filter
90 x 360 secs Lights
25 x Dark
25 x Dark Flat
25 x Flat
20 x Bias 1/4000
Stacked in DSS 4.0.1
Processed in Star Tools
Click image to enlarge

M64 Black Eye Galaxy
Image by Gary Yule captured on 2018-04-18 from Manchester, England
Opticstar ARX200 8" f/3.9 Astrograph
Opticstar f/3.9 Coma corrector
Hypertuned and Rowan Belt Modded HEQ5
Nikon D5100 ISO 1600
Lumicon Deep Sky Filter 60 x 360 secs Lights
50 x Dark
50 x Dark Flat
50 x Flat
30 x Bias Stacked in new DSS 4.0.1 Processed in Star Tools
Click image to enlarge

Sample image. Sample image.
The Moon. 49.8% Waxing Gibbous Moon
Image by Gary Yule captured on 2018-04-22 from Manchester, England
Opticstar ARX200 f/3.9 8" Astrograph
Rowan Belt Modded HEQ5
Opticstar SL131-C Coolair Camera
Opticstar Crysral View Filter
30 x 1/250
ISO 400
Stacked and Processed in Registax 6
Click image to enlarge

The Moon. 73.1% Waxing Gibbous Moon through thin cloud
Image by Gary Yule captured on 2018-03-25 from Manchester, England
Opticstar ARX200 8" Astrograph f/3.9
HEQ5
SL-131C Coolair Camera
30 x 0/250 secs exposures
Stacked in Registax 5
Processed in Opticstar View
Shot through light cloud in Stretford, Manchester
Click image to enlarge


Notice
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.

How To Order Terms & Conditions Email Us
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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 M20 nebula shot by John Haunton with the Opticstar DS-145M ICE.
Feedback
We want to hear your comments.
contact
Sample Images
Opticstar DS-335C ICE
updated: 20th August 2010
Sample image.
The M42 nebula shot by Nick Witte Vermeulen with the Opticstar DS-335C ICE.
Astrophotography
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.
more
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: 1st May 2018
Willman Bell books.
Acclaimed books from Willmann Bell...
more
Opticstar News
New DS-616C XL+ Model
posted: 24th August 2017
Opticstar DS-616C XL+.
Star product, improved.

The new Opticstar DS-616C XL+ deep-sky CCD is the successor to the popular DS-616C XL that earned the annual star product award back in 2013. It maintains all the features of the original model as well as other improvements.


DS-616C XL is Astronomy Magazine's Star Product
posted: 12th September 2013
Opticstar DS-616C XL is Astronomy magazine's product of the year.
Star product.

The Opticstar DS-616C XL deep-sky CCD camera has earned the annual star product award from Astronomy, the world's best-selling astronomy magazine. Read about it in the September 2013 issue.

© Opticstar Ltd 2018