#19860 - Lacerta for Lodestar Focus Aide
199 Smith Street · Lowell, Michigan 49331 · U.S.A.
Telephone: 616-897-9351 · Fax: (616) 897-8229 · Toll Free: 888-488-0381
Lacerta for Lodestar User’s Guide, Revision 1
Page 3 of 5
#19860 Kit Contents
Lacerta tilt-window focus aide holder,
C-thread retainer ring,
0.8mm spacer,
1.6mm spacer,
C-to-CS extension.
NOTE: Not all items will be used in every installation.
Lacerta for Lodestar Installation
Remove Lodestar:
The Lacerta tilt-window is specially designed to fit into the Lodestar camera without significantly
affecting back-focus. First remove the camera from your current Off-Axis Guider (OAG) installation.
Insert the Lacerta:
Drop the Lacerta into the camera head. Note the device will fit precisely into the hole just above the
image sensor bringing the tilt-window close to the sensor. A spacer can also be placed beneath the
Lacerta to increase the distance above the sensor or allow for a tighter fit
of the retainer or pick-off stalk. The proximity of the tilt-window to the
sensor is not critical.
OAG Variations:
Your installation will vary depending upon how the OAG is connected.
For example, the Starlight Xpress OAG and AO unit use a pick-off stalk that
ends with a male C-thread. This male C-thread can be used to hold the
Lacerta device in place without any other spacers or retainers needed.
Simply drop the Lacerta into place, screw the stalk into the female C-
thread, and then insert the stalk back into the OAG or AO unit. Either
spacer can be added if the stalk does not screw down tightly.
Other OAG installations may use the female C-threads in different ways.
The C-thread retainer can be used to hold the Lacerta in place if the entire
Lodestar body is clamped into the OAG using the 1-1/4” outer diameter of
the body. Alternatively, the C-to-CS extension can be used if there is not
enough female C-thread left exposed and the OAG has a male C-thread to connect the Lodestar.
