Tele Vue 102iis - Manual (Page 2)

2
1.0 Getting Acquainted with the Tele Vue-102iis
1.1 Optical tube assembly
The OTA consists of the objective cell, tube and focuser. The front cell houses the carefully aligned
objective. Never attempt to loosen the 3 alignment screws in the front lens cell. The tube is aluminum and
powder coated, requiring no special care.
The focuser on the 102iis 102iis 102iis 102iis 102iis permits use of a larger draw tube that does not vignette the field rays exiting
the objective. The two tension screws (not shown) on the top of the focuser body can be adjusted to add
resistance when using heavy equipment. These tension screws tighten against a brass clamp ring, which
then cinches down on the Teflon sleeve in which
the draw tube slides. For photography it is not
necessary to tighten beyond the need to keep a
camera stationary but we do recommend to
tighten them in unison to avoid any focus shift.
Note that even when sufficiently tight, the focuser
knobs can still drive the draw tube.
The end ring can be adjusted (and locked)
to compensate for any tilt effects seen in CCD
imaging.
The threaded holes on top of the focuser
body accept the Digital Indicator Kit.
The four lock screws in the end of the
draw tube tighten against either the tapers of the
Imaging System Adapter and 5” Extension Tube,
or brass clamp ring within the 2” Accessory
Adapter.
Operation of the rack and pinion focuser
is via the 6:1 ratio Focusmate on the right side or either of the 1:1 knobs.
2.0 Mounting and Set Up
The MRS-4000 ring set is recommended for the Tele Vue-102iis. Note that the short main tube of this “Bino
Vue” friendly scope design requires extension tubes for single-eye viewing or for imaging applications. This
results in a “rear heavy” scope that may also require the APL-1096 “Long Balance Plate” accessory in order
to move the scope forward enough to achieve balance. The plate attaches directly to the AVT-1011 adapter
for all Vixen equatorial mounts, or directly to the cradle of our Gibraltar 5 head for alt-az visual operation.
The center of gravity is moved forward to avoid the need for balance weights at the front of the tube.
6:1 Knob
1:1 Knob
Lock Screws (typical)
Jack Screws (typical)
Jam Screws (typical)
Digital Indicator
Mounting Points
1:1 Knob
MRS-4000 - Heavy duty tube ring set with
slotted spreader bar to adjust ring spacing
for a wide variety of equatorial mounts. APL-1096 - can be used under the tube
ring to shift the telescope weight forward
to help balance should it be necessary.