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MOTOFOCUS Configuration Information for
Certain GSO and William
Optics Crayford Focusers
These MOTOFOCUS units all use miniature motors.
GSO / William Optics 2" Crayford focusers including SCT and
Maksutov Cassegrain focusers, Newtonian focusers, Dobsonian focusers (Meade
Lightbridge) and original-style replacement focusers for Synta-made refractors
(Sky-Watcher, Celestron, Orion
and more).
NOTE: There has been a lot of confusion between GSO (Guan Sheng Optical Co. Ltd. in Taiwan)
and William Optics focusers and their differing
configurations. Where the focuser has been used consistently on a
particular telescope (such as the Meade Lightbridge series)
the focuser can be identified by the telescope. In other cases, one may
need to look at identifying characteristics of the particular focuser in order
to purchase the correct MOTOFOCUS unit. Several of these configurations are
described here. (Due to many manufacturing variations, this information
may change at any time.) To be sure that you get the correct MOTOFOCUS for your Microfocuser equipped GSO/WO focuser, you can email
a picture of the focuser from the angle shown in figure one and two (below),
including the whole focuser in the picture.
EARLY VERSION WITHOUT MICROFOCUSER
Configuration ONE (see figure ONE) has
a focuser tensioning screw that is directly in line with (not above) the drive
shaft and a brake screw below the drive shaft. Configuration TWO (see
figure TWO) has a
focuser tensioning screw above (not directly in line with) the drive shaft and a
brake tensioning screw below the drive shaft.
EARLY VERSION WITH MICROFOCUSER
Check the pictures (figure THREE) below (click to
enlarge) to verify if you have configuration THREE. Notice the positioning
of the thumb screws (as explained above), the shape of the Microfocuser housing and the type of slow-speed knob.
The MOTOFOCUS unit slips over the slow-speed knob. We have seen both black
and purple versions.
At this time, our MOTOFOCUS is
based on one or more of the following characteristics:
1) The tension and brake screw alignment (see above). This
configuration matches Figure One above.
2) The diameter of the slow-speed knob (identified by the knurling of the
adjacent knob?). Compare with the picture below.
3) The shape of the Microfocuser housing (rounded or flat). This
configuration is rounded.
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Without
MOTOFOCUS |
With
MOTOFOCUS Attached |
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Figure THREE
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LIGHTBRIDGE DUAL-SPEED FOCUSER
The GSO Dual-Speed Focuser used on the
Meade LightBridge Telescope is configuration FOUR (see figure FOUR).
Please note that the single-speed focuser used on the Meade LightBridge
Telescope should match configuration TWO
above.
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Meade LightBridge
Dual-Speed Focuser |
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Figure FOUR
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MEGREZ 90 FOCUSER AND REPLACEMENT FOCUSER FOR SYNTA-MADE REFRACTORS
The following pictures (figure
FIVE) show the replacement focuser for Synta Refractors and the focuser used on
the Megrez 90. Some FLT focusers may match this style (undetermined at
this time). These focusers
are designated as configuration FIVE.
MEGREZ 110 FOCUSER
The following picture (figure
SIX) shows the focuser used on
the Megrez 110.
Megrez 110
Focuser
Figure SIX
SKY-WATCHER EQUINOX 80 PRO FOCUSER
The following picture (figure
SEVEN) shows the focuser used on
the Sky-Watcher Equinox 80 Pro.
Sky-Watcher Equinox 80 Pro
Focuser
Figure SEVEN
SUMMARY OF CURRENT CONFIGURATIONS
NOTE: To be sure that you get the correct MOTOFOCUS for
your Microfocuser equipped GSO/WO focuser, you can
email
a picture of the focuser from the angle shown in figure one and two (above),
including the whole focuser in the picture. We may request
measurements of certain parts of your focuser. In some cases, we may
need to have you ship your focuser to us in order to verify the
configuration and/or complete your order.
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