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VI S UA L OB SE RV ING
Eyepiece
The telescope requires an eyepiece to view images.
eyepiece determines magnification of your telescope.
The telescope may come with the eyepiece as standard
accessory when you purchase it as a package including a mount.
Magnification of the Telescope
Dividing the focal length of the telescope by the focal length of the
eyepiece gives the magnification.
Example: Using the FL55SS with SLV20mm or SLV5mm eyepiece.
Eyepiece
Telescope's
focal length
SLV20mm
300mm
SLV5mm
300mm
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.
The
Telescope's
Magnification
focal length
20mm
15x
5mm
60x
Visual Observing Configuration
FL55SS Visual Back
D = 5 5 m m f = 3 0 0 m m
Vixen Co.,Ltd. MADE IN JAPAN
Focusing the Telescope
Look though the FL55SS with an
eyepiece of low magnification.
Turn the focus knob forward or
backward as shown in the
figure until images in the
eyepiece's field of view come
to focus clearly.
6
Eyepiece
31.7mm
(Optional)
45mm DC Ring
Prism Diagonal
31.7mm
(Optional)
Eyepiece Adapter 31.7
60mm to 43mm
AD Ring
Eyepiece
45mm DC Ring
31.7mm
(Optional)
Extension Tube VC
D = 5 5 m m f = 3 0 0 m m
Vixen Co.,Ltd. MADE IN JAPAN
合 焦ハンドル
Focus Knob
（フォーカスノブ）
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