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®
iOptron
®
VersaTM 108mm
Doublet ED APO Refractor Telescope
INSTRUCTION MANUAL
WARNING!
NEVER USE A TELESCOPE TO LOOK AT THE SUN WITHOUT A PROPER FILTER!
Looking at or near the Sun will cause instant and irreversible damage to your eye.
Children should always have adult supervision while observing
Product #6102
iOptron Corporation | 6E Gill Street | Woburn, MA 01801 | www.iOptron.com
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Welcome to a new w orld of adventure!
Enhanced by the world's most advanced
optical design and cutting-edge optical
processing, iOptron
air-spaced 108mm Apochromatic doublet
refractor offers a versatile platform that
delivers exceptional performance for both
visual observing and astrophotography. With
outstanding color correction and crisp imaging
you'll be able to view beautiful images through
your eyepiece, CCD camera, or DSLR
camera.
®
VersaTM 108 double
Your telescope does not come with eyepieces
and diagonal so as to offer the greatest
flexibility in configuring it to your needs.
The 2” compression ring accessory holder
accepts 2” eyepieces, star diagonals, camera
adapters, etc. The 1.25” compression ring
adapter slips into the 2” holder. This lets you
use optional 1.25” accessories (eyepiece, star
diagonal, camera adapter, terrestrial image
erecting diagonal, DSI-type camera, etc.)
These instructions will help you set up and
properly use and care for your telescope.
Please read them over thoroughly before
getting started.
Getting Started
Your telescope comes fully assembled from
the factory. The optics have been installed
and collimated, so you should not have to
make any adjustments to them. Keep the dust
covers on the telescope when it is not in use.
Mounting the Telescope
The iOptron VersaTM 108 is a perfect mate for
the iOptron MiniTower™ series goto
altazimuth mount, or the iEQ
mount. You need a dovetail rail (either Vixen
or Losemandy-D type one depends on your
mount’s dovetail saddle) to mount the scope
onto an telescope mount.
®
goto equatorial
Use of Optional Accessories
Selecting an Eyepiece
Always begin viewing with the lowest power
eyepiece. (Note: a 20 mm focal length
eyepiece has a lower power than a 10 mm
one.) A formula can be used to determine the
power of each eyepiece: Telescope focal
length divided by eyepiece focal length equals
magnification.
Ex. 648mm ÷ 20mm = 32.4X (magnification)
Focusing Telescope
Point the telescope so the front end is aimed
in the general direction of an object you wish
to view. When you first look in the eyepiece,
the image you see may be fuzzy, or out of
focus. If so, gently turn the focus knob with
your fingers until the image becomes sharp.
Go a little bit beyond sharp focus until the
image just starts to blur again. Then reverse
the rotation of the knob just to make sure
you’ve hit the exact focus point. You will have
to readjust the focus when aiming at subjects
of varying distances, or after changing
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eyepieces. Turn the fine tuning knob for finer
adjustments.
If you have trouble focusing, rotate the focus
knob counterclockwise as far as it will go.
Now look through the eyepiece while slowly
rotating the focus knob clockwise. You should
soon see the point at which focus is reached.
Try to practice this during daytime by aiming
the main telescope tube at a land-based
target at least 200 yards away (e.g. A
telephone pole or building).
If you use a finderscope with VersaTM 108,
you need to align the finderscope with the
main telescope tube.
First, look through Main Telescope Tube and
establish a well-defined target (see focusing
telescope section). Tighten all lock knobs of
your mount (Declination, Latitude, Right
Ascension, and Horizontal Axes) so that
telescope’s aim is not disturbed. Then look
through the finderscope and adjust the each
finderscope adjustment screw until the
crosshairs of the finderscope are precisely
centered on the same object already centered
in Main Telescope Tube’s field of view. Now,
objects located first with the finderscope will
be centered in field of view of the main
telescope.
Aligning Finderscope
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Specifications
Optical Design Refractor
Clear Aperture 108mm
Resolving Power 1.05 arc seconds
Visual Limiting Magnitude 12.5
Case Dimensions 30” x 8.9” x 9”
Revised May 2011
Focal Length 648mm
Focal Ratio f/6
Lens Type 2 elements, Air-spaced, ED S-FPL51+S-NBM51 glass
Dew Shield Retractable
Focuser 2 ", 360° Rotatable 1:11 Crayford dual speed focuser
Tube Length 535 mm
Tube Weight 10 lbs
Accessories 114mm Tube ring + 1.25" Adapter brass compressing ring
Packaging High quality aluminum case
Gross Weight 23.1 lbs
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