Vixen SD Series User manual

Instruction Manual for
Apochromatic Refractors

2
PREFACE
This manual describes the SD81S, SD103S and SD115S apochromatic refractors. You may occasionally find descriptions in
the text not relevant to your particular model. If you purchase the product with a telescope mount as a complete package, be
sure to read the instructions for your mount along with this manual.
Never look directly at the sun with the telescope or its finder scope or eyepiece. Permanent and irreversible eye
damage may result.
Thank you very much for your purchase of a Vixen astronomical telescope.
WARNING
Do not leave the optical tube uncapped in the daytime. Sunlight passing through the telescope or finder scope may cause a fire.
Do not use the product while moving or walking, injuries could result from a collision with objects or from stumbling or falling.
Keep small caps, plastic bags or plastic packing materials away from children. These may cause a danger of swallowing or
suffocation.
CAUTION
HANDLING AND STORAGE
Do not leave the product inside a car in bright sunshine, or in other hot places. Keep away strong heat source away from the product.
When cleaning, do not use solvents such as paint thinner or similar products.
Do not expose the product to rain, water, dirt or sand.
Avoid touching any lens surfaces directly with your hands. In case a lens becomes dirty with fingerprints or general smears, gently
wipe it using a commercially available lens cleaner and lens cleaning paper or cloth, or consult your local Vixen dealer.
Blow off dust on lenses using a commercially available blower brush.
For storage, keep the product in a dry place and do not expose to direct sunlight.

If the knobs to tighten the tube rings interfere with a telescope’s mount, replace the knobs with the supplied M6X18mm bolts.
Unscrew the knobs on the tube rings to remove. Replace them with the M6X18mm bolts. Then, tighten the bolt with the supplied
Allen wrench moderately. It is not necessary to tighten the bolts securely.
About the M6X18mm bolts supplied with the SD81S
M6X18mm bolts Allen wrench of 5mm Knobs of the tube rings M6X18mm Bolts for replacement
3
CONTENTS
The SD shipping box contains the items listed below. Check if all the items are included.
In Case of SD81S
1
1
1
1
2
1
SD81S Optical Tube
Flip Mirror Diagonal
XY Red Dot Finder II Body
Low-profile Mount for the finder
M6X18mm bolts
Allen wrench of 5mm on a side
Instruction manuals for the optical tube and accessories
In Case of SD103S and SD115S
1
1
1
1
1
SD103S or SD115S Optical Tube
Flip Mirror Diagonal
7X50mm Finder Scope with illuminated reticle
50mm XY Finder Bracket II
O ring
Instruction manuals for the optical tube and accessories

Drawtube Lock Screw
Dovetail Tube Plate or Dovetail
Slide Bar M for SD81S
Finder Bracket Shoe
Metal Carry Handle
(With 1/4 inch camera screw)
Eyepiece Adapter 31.7mm
(An eyepiece projection camera
adapter sold separately can be
attached to the top part.)
Flip Mirror Diagonal
(Threaded to fit a 42mm T-ring)
Tube Rings
Drawtube
Eyepiece Setscrew
Focus Knob
Rack-and-Pinion Focuser
Objective Dew Shield
Objective Lens
(Inside)
Finder Bracket Lock Screw
Dovetail Slide Bar M
4
NAME OF EACH COMPONENT
EXAMPLE: SD103S
SD81S

D=103mm f=795mm
MADEIN JAPAN
SUPEREXTR A-LOWDISPERS ION OPTICS
5
SETTING UP THE TELESCOPE
Loosen the finder scope bracket lock screw on the finder bracket
shoe of the optical tube. Attach the 7X50mm finder scope (or XY
Red dot finder for SD81S) as shown in the figure. Tighten the
finder bracket lock screw securely.
Attach the Finder Scope
For the novice telescope user it is difficult to locate a selected
object in the telescope’s field of view at high magnification. Using
a finder scope will make this easier.
For usage, refer to the instructions for your finder scope.
Use of the Finder Scope
Loosen both the dovetail plate lock screw and safety screw
until the tips of these screws no longer extended into the inner
part of the dovetail block.
Slide the dovetail mounted optical tube into the dovetail
mounting block as shown in the figure. Tighten the dovetail
lock screw (centered on the notch) onto the dovetail tube plate
until snug. First tighten the dovetail lock screw, and then
tighten the small chrome safety screw onto the dovetail
mounting block until snug.
Refer to your mount instructions as to balancing the optical
tube.
Attach the Optical Tube Assembly to the Mount Objective Dew Shield
Tube Ring
Tube Ring
Objective Lens
(inside)
Dovetail Tube Plate
Safety Screw
Dovetail Plate
Lock Screw
Finder Bracket
Lock Screw
Finder Bracket
7X50mm Finder Scope with
illuminated reticle
Drawtube Lock Screw
Focus Knob
Metal Carry Handle
(SXD2 mount and SD103 optical tube shown here.)
Refer to your mount instructions along with this manual.
1
2

EA60mm to 50.8mm SX
(supplied)
EA60mm to 50.8mm SX
(supplied)
Extension Tube VC
Eyepiece 31.7mm
Eyepiece 31.7mm
Eyepiece 50.8mm
Flip Mirror Diagonal
(supplied)
Drawtube Lock Screw
(used to hold the drawtube tightly)
6
VISUAL OBSERVING
The optical tube assembly requires an eyepiece to view images.
The eyepiece determines magnification of your telescope.
The optical tube assembly does not come with the eyepiece as
standard accessory unless you purchase a complete telescope
package.
Eyepiece Visual Observing Configuration
Focusing the Telescope
Dividing the focal length of the telescope by the focal length of the
eyepiece gives the magnification.
Example:
Using the optical tube unit with SLV20mm or SLV5mm eyepiece.
Note:
Begin with an eyepiece with long focal length (large number in millimeters).
When using an eyepiece with short focal length, the image becomes
dimmer and the range of field of view becomes narrower. Also the range
of sharp focus becomes smaller.
Lookthoughthetelescopewithan
eyepieceoflowmagnification.
Turnthefocusknobforwardor
backwardasshowninthefigure
untilimagesintheeyepieceʼsfield
ofviewcometofocusclearly.
Magnification of the Telescope
Eyepiece
SLV20mm
SLV5mm
Telescope’s focal length
625mm (SD81S)
795mm (SD103S)
8 9 0 m m ( S D115 S )
625mm (SD81S)
795mm (SD103S)
8 9 0 m m ( S D115 S )
Eyepiece’s focal length
20mm
5mm
Magnification
31.2 5X
39.75X
44.5X
125X
159X
178X
Focus knobFocus knob

7
Some of the optional accessories shown in this diagram will be needed if you take pictures with a DSLR
camera, a compact digital camera or a CCD video camera.
Photographic Configuration
T-C Ring CCD Video Camera
T Ring
(appropriate to your camera)
T Ring (appropriate to your camera)
The inner ring is removed.
Smartphone
Camera Adapter
Digital Camera Quick Bracket II
LCD monitor
DSLR Camera Body
Eyepiece Projection
Camera Adapter
Eyepiece
31.7mm
Eyepiece
31.7mm
Compact
Digital
Camera
SD81S
SD103S
S D115 S
EA42mm to 31.7mm SX
(part of the Flip Mirror Diagonal)
Spacer Ring SD81
(for use with SD81 only)*2
SD Flattener HD
Filter 52mm*1
Filter 52mm*1
*1 A filter may cause ghost if it is attached.
*2 It is included both in SD Flattener
HD Kit and SD Reducer HD Kit.
Reducer HD
EX Tube 66*2
Wide Photo Adapter 60mm
Wide Photo Adapter 60DX for EOS
Flip Mirror Diagonal
(supplied)
EA60mm to
50.8mm SX
(supplied)
60mm
DSLR
Camera Body
Canon EOS
(Canon Rebel)
Camera Body
Smartphone

Flip Mirror Diagonal,
Dovetail Slide Bar M (built-in)
XY Red Dot Finder II
M6X18mm bolts (2 pcs) and a 5mm
Allen wrench
Flip Mirror Diagonal,
Dovetail Tube Plate (built-in)
7X50mm Finder w/illuminated reticle
50mm XY Finder Bracket II
Flip Mirror Diagonal,
Dovetail Tube Plate (built-in)
7X50mm Finder w/illuminated reticle
50mm XY Finder Bracket II
65キ-7-0.05S-(DC1450GA)(M)
Specifications
Objective Lens
Lens coatings
Effective Aperture
Focal Length
Focal Ratio
Light Gathering Power
Resolving Power
Limiting Magnitude
Focuser Design
Threads
Push-fit
Optical Tube Length
Outer Diameter
Weight
Objective Lens
Focuser
Dimensions and Weights
Finder Scope
Accessories
SD Apochromatic lens
Multi-coated
81mm
625mm
f/ 7.7
134X unaided eye
1.43 arc sec.
11. 3
Rack-and-pinion focuser
with drawtube lock knob
60mm, 42mm for T ring
50.8mm, 31.7mm
585mm
90mm
3.6 kgs (Net 2.3 kgs)
7.93 lbs (Net 5.06 lbs)
XY Red Dot Finder II (zero power)
SD Apochromatic lens
Multi-coated
103mm
795mm
f f / 7.7
217X unaid ed e ye
1.13 arc sec.
11. 8
Rack-and-pinion focuser
with drawtube lock knob
60mm, 42mm for T ring
50.8mm, 31.7mm
810mm
115 m m
5.4 kgs (Net 3.6 kgs)
11.89 lbs (Net 7.93 lbs)
7X50mm Finder w/illuminated reticle
SD Apochromatic lens
Multi-coated
115 m m
890mm
f/ 7.7
270X unaided eye
1.01 arc sec.
12.1
Rack-and-pinion focuser
with drawtube lock knob
60mm, 42mm for T ring
50.8mm, 31.7mm
930mm
125mm
6.2 kgs (Net 4.4 kgs)
13.65 lbs (Net 9.69 lbs)
7X50mm Finder w/illuminated reticle
Model SD81S SD103S SD115 S
5-17-3 H i gashitokorozawa,Tokorozawa,Saitama359-0021, Japan
Phone [phone](International)
F a x [phone](International)
https://www.vixen.co.jp