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EXPLORE SCIENTIFIC
[ U.S.A. ]
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[ Taiwan ]
i-Optron GoTo
[ U.S.A. ]
BRESSER
[ Germany ]
ORION
[ U.S.A. ]
William Optics
[ Taiwan ]
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8" Cassegrain Telescope by GSO
YOU ARE HERE >> HOME| Telescopes with Motor & GoTo| GSO 8" RC on EXOS-II Dual Axis Motor

8" F/8 Ritchey-Chrétien Telescope with EXOS-II Dual Axis Motor & HPC
D=203mm / F=1600mm RC F/8 - MADE IN TAIWAN Telescope
111000 + 18% GST
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EXOS-II GoTo Upgrade Kit . . . . Rs 33600
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Optical Design: True Ritchey Chrétien / RC by GSO
Ritchey Chretien systems are excellent Cassegrain-configuration optical systems which are great performers for many different types of astronomical observation, but are particularly well suited for astrophotographic purposes. The RC has a concave hyperbolical primary mirror and a convex hyperbolical secondary mirror.

Contrary to Maksutovs or Schmidt-Cassegrains which have spherical mirrors and need image correctors, and contrary to Newtonians that need coma correctors, the RC system is a well corrected photographical instrument that uses only mirrors (no false colour!) and does not require any corrector with many cameras.

Hyperbolic RC system is superior to a standard Schmidt-Cassegrain and other optical designs in many important respects: a well-designed RC will have no Coma (elongation of stars) around the edge of the field; an RC will give a sharper on-axis response than most SCTs or Newtonians; they are completely false colour free; they have no front corrector plate, thus reaching thermal equilibrium quicker and cutting down dramatically on dewing issues.

The resulting image correction throughout the field as well as the sharpness on the optical axis are superior to typical Schmidt-Cassegrains or Newtonians.
 
Advantages of RC Telescopes compared to MAC and SCT
  • Aperture 8" / 203mm.......Focal Length 1600mm
  • f/8 is faster than a 8" SC or Mak
  • illuminated field is much bigger
  • you can attach 2" eyepieces and full size SLR/DSLR cameras without vignetting
  • two hyperboloidical mirrors with 96% reflectivity lead to a bright image
  • faster cool-down time and no dew problems because of open tube design without front correcting plate
  • enough back focus for all kinds of accessories like correctors and reducers
  • 2" MONORAIL Focuser with better stability
  • Less dew problems against Schmidt Cassegrain or similar
  • fixed mirrors and 2" Crayford focuser with 1:10 dual speed transmission - no problems with mirror shift
  • A rotatable, machined dual-speed (10:1) Crayford focuser equipped with a sturdy linear-bearing provides precise focus adjustment without slippage or flexure with heavy astrophotography accessories attached
  • Features one dovetail finder scope bases.
  • 8" RC f/8 Astrograph is designed for full illumination of the "35mm format" (24 x 36mm).
 
BRESSER EXOS-II Dual Motor EQ Mount
Mount and Tripod. The BRESSER EXOS 2 is a rugged mount with high rigidity and precision tracking for visual observation and astrophotography. The tripod is extremely rigid to suppress vibrations really well. This model is very well machined and has a polar finder scope and precise graduated circles. A powered twoaxis control (BRESSER Exos Duo) or a GoTo-Kit is available as an optional extra. The BRESSER EXOS 2 can take the weight - depending on length and use of up to 13 kg. This allows you to use refractors of up to 152 mm aperture and mirror telescopes of up to 203 mm aperture.
  • The BRESSER EXOS 2 is a rugged equatorial mount with high rigidity and precision tracking for visual observation and astrophotography
  • The tripod is extremely rigid to suppress vibrations really well. This model is very well machined and has polar finder scope and precise graduated circles.
  • A powered two axis control (BRESSER Exos Duo) or a GoTo-Kit is available as an optional extra.
  • The BRESSER EXOS 2 can take the weight - depending on length and use of the telescope of up to 13 kg
  • Included: Mount, height adjustable tripod, 2x flexible shaft, polar finder scope, 4.5 Kilogram counterweight
 
BRESSER EXOS-II Mount Special Features
  • weight EXOS II Goto: 4.5kg (without counterweight shaft, which weights 1.0kg)
  • load capacity: 13kg
  • weight Tripod: 4.9kg
  • maximum height tripod: 108cm
 
BRESSER RA/DEC-Motor Kit Duo for EXOS-2 and EQ/MON-2
This Bresser Messier RA+DEC-Motor + Controller MON2 lets you control your Messier telescope more comfortably. Including controller. Suitable for Bresser Messier telescopes or mount with Exos-2 or Mon-2 equatorial mount.

Motorkit for both axes (RA und DEC). Handcontrol with 3 preset speeds (1x (sidereal speed); 8x; 32x). Suitable for entry level astrophotography.
 
What's in the Box
  • 8' F/8 RC Telescope
  • Choice of two eyepiece (Any ONE from : 4, 6, 9, 12mm and any ONE from 15, 20, 25, 32mm)
  • Mirror Star Diagonal 1,25"
  • 8x50 Achromatic Finder Telescope
  • 2'' Dual Speed 1:10 Microfocuser
  • Mirror Star Diagonal 1.25"
  • Finder shoe (mounted)
  • 1X 50mm Spacer
  • 2X 25mm Spacer
  • Dual Vixen Dovetail Plate (Top & Bottom)
  • Dust Cover
  • BRESSER EXOS-II EQ-5 Mount with Dual Axis Motor
  • Hand Pad Control
  • Height Adjustable Tripod
  • Polar Finder Scope
  • 1x counterweight 4.5kg
  • 2x flexible shaft
 
TELESCOPE SPECIFICATION
RC 8 8" f/8 Ritchey-Chrétien Telescope with EXOS-II
Optical Design Ritchey- Chretien: True RC (Ritchey-Chretien) with a hyperbolic primary and a hyperbolic secondary mirror. No glass corrector plates or lenses in the optical train.
Diameter Primary Mirror Quartz - Mirrored 8" /203 mm:surface quality 1/12 Lambda or better. Primary Mirror 96% reflectivity dielectrically coated.
Secondary mirror Secondary 96% reflectivity dielectrically coated/collimatable
Focal Length, Focal Ratio 1624 mm, f/8
Recommended Maximum Visual Power 33x through 300x approx.
Accepts Eyepiece Barrel Ø 50.8mm (2") to 31.7mm(1.25")
Focuser 1:10 Crayford focuser for extremely smooth focusing. The dual speed 1:10 focusing knob is particularly important for astro imaging. No image shift and up to 5kgs load capacity! The focuser accepts 2" and 1.25" accessories.
The 2" Monorail focuser - much better, than a simple crayford design 
Eyepiece(s) Your choice of any two GSO Premium Plossl Eyepiece 1.25''

any one from series:: 12mm / 9mm / 6mm / 4mm
any one from series:: 15mm / 20mm / 25mm / 32mm
(subject to availability in choices)
Finder Scope 8x50mm Fully multi-coated achromatic finder
Star Diagonal Mirror Star Diagonal 1.25"
Computer-optimized baffle system The inside of the tube is lined with computer-optimized baffles for optimum suppression of stray light.
Length of tube 580 mm incl. focuser
diameter of tube 230 mm
Optical Tube Net Weight 7.5 kg
Dovetail mounting rail A GP-style dovetail rail is mounted on the underside of the tube. It fits in all mounts that accept GP / Vixen dovetail plates.
Mount / Stand EQUATORIAL (EQ5) parallactic mount and steel tripod stand
Mounting Base Net Weight 5.3 kg
Tripod Net Weight 4.6 kg
Tripod Height: 68cm - 108cm
Counterweight(s) 1x 4.5 kg
Max weight of the mounted device about 13 kg (Optics)
EXOS-II GENERAL TECHNICAL DATA
Colour white
Material Metal
Product series Messier
EXOS-II DIMENSIONS & WEIGHTS
Net weight (without access.) 4500 g
Net Weight total (incl. accessories) 14500 g
Net weight tripod (incl. accessories) 4.9 kg
Shipping Weight 20 kg approx
 
Instructions for use in ENGLISH
Bresser Operating Manual
 
WARNING
 
The following items are FREE with the telescope listed above. [ Subject To Availability ]
Magnitude 5 STAR Atlas
Directional Compass  FREE - NOT IN STOCK
Micro Fiber (Anti-Static) Cleaning cloth
Optics Cleaning Fluid
COLOUR POSTER 17.5"  x 22.5 "  one
110 Messier Object Locator     A4 size front back colour print
109 Deep Sky CALDWELL Catalogue A4 size front back colour print
Star Dial - Identifying Stars & Constellations
Various Astronomical Post-Card (SET-3)
Desiccant Cap - Refillable desiccant cap to protect fine optics
Astronomical Telescope - user guide
The Moon Map Poster B/W chart unfold to 22"x26"
 
Suggested Accessories with this Telescope
    SOLAR FILTER
  • SOLARIX Solar filter (Explore Scienfific - USA) provide more pleasing and natural Yellow-Orange image of the Sun . . . . Rs 1830
    EYEPIECES (Super Premium Plossl for GSO) EYEPIECES (Super Premium Plossl for GSO)
  • 40mm Plossl Eyepiece 1.25" . . . . Rs. 2820
  • 32 mm Plossl Eyepiece 1.25" . . . . Rs 2640
  • 25 mm Plossl Eyepiece 1.25" . . . . Rs. 2550
  • 20 mm Plossl Eyepiece 1.25" . . . . Rs. 2460
  • 15 mm Plossl Eyepiece 1.25" . . . . Rs. 2280
  • 12 mm Plossl Eyepiece 1.25" . . . . Rs. 2100
  • 9 mm Plossl Eyepiece 1.25" . . . . Rs. 2100
  • 6 mm Plossl Eyepiece 1.25" . . . . Rs. 2100
  • 4 mm Plossl Eyepiece 1.25" . . . . Rs. 2100
  • GSO SuperView 15mm 1.25" Wide Angle Eyepiece . . . . Rs. 3000
  • GSO SuperView 20mm 1.15" Wide Angle Eyepiece . . . . Rs. 3000
  • GSO SuperView 30mm 2 " Wide Angle Eyepiece . . . . Rs. 4800
  • GSO SuperView 42mm 2" Wide Angle Eyepiece . . . . Rs. 4800
  • GSO SuperView 50mm 2" Wide Angle Eyepiece . . . . Rs. 4800
    DIAGONAL
  • GSO 1.25" Mirror Diagonal . . . . Rs.2100
  • GSO 2 inch Mirror diagonal . . . . Rs 5700
  • GSO 2 inch 99% Dielectric mirror Diagonal CNC . . . . Rs 7500
  • GSO 2 inch 99% Quartz Dielectric mirro Diagonal CNC . . . . Rs 9300
  • GSO 45 Degree Erecting Image Diagonal . . . . Rs 2640
    FINDER
  • GSO 6x30 Straight finder . . . . Rs.2460
  • GSO 8x50 straight finder . . . . Rs 3900
  • GSO 8x50 RA finder . . . . Rs 4800
    BARLOW
  • GSO 2x ED-Barlow-Lens (Multicoated) . . . . Rs.4800
  • GSO 2X Achromatic BARLOW LENS- fully multicoated 1.25" . . . . Rs. 1470
  • ED 3X Barlow Lens GSO 1.25" . . . . Rs. 2640
  • 3 Elememt 2.5x Barlow GSO 1.25"  . . . . Rs. 2370
  • 3 Elememt 5x Barlow GSO . . . . Rs. 2820
    CAMERA ATTACHMENTS
  • T-RING Nikon . . . . Rs. 930
  • T-RING Canon . . . . Rs 930
  • T Adapter 1.25" . . . . Rs. 750
  • Super ACHROMATIC (MultiCoated /High Colour corrected) 2X BARLOW 1.25" OD, 2 ELEMENT LENS with T-thread for direct camera attachment /with Brass compression ring / GSO. . . . Rs. 3,000
  • 2 inch T-2 Camera Adapter . . . . Rs 1650
  • GSO 40mm Camera adapter 2 inch . . . . Rs. 1560
  • Eyepiece Projection Camera Adapter . . . . Rs. 2100
  • Mobile Cell Phone Adapter . . . . Rs. 1560
  • GSO 1.25" 32mm Camera Projection Lens (CPL) eyepiece ... Rs. 3900
  • GSO 1.25" 40mm Camera Projection Lens (CPL) eyepiece ... Rs.4080
  • GSO 2" 30mm Camera Projection Lens (CSV) eyepiece ... Rs.5700
  • GSO 2" 42mm Camera Projection Lens (CSV) eyepiece ... Rs.5700
  • COMA Corrector 2 inch . . . . Rs 5700
  • GSO....0.5X Focal Reducer 1.25" with 25mm extension tube ....Rs 1560
  • GSO.....0.5x Focal Reducer 2 inch ....Rs 2100
  • GSO Planet View filter each . . . . Rs 660
  • GSO 2 inch EXTENSION TUBE
    35mm . . . . Rs 1470
    50mm . . . . Rs 1560
    80mm . . . . Rs 1650

  • GSO....0.5X Focal Reducer 1.25" with 25mm extension tube ....Rs 1560
  • GSO.....0.5x Focal Reducer 2 inch ....Rs 2100
  • GSO Planet View filter each . . . . Rs 660
 
 
 
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