Starlight Instruments, LLC
Starlight Instruments, LLC
2380 E. Cardinal Drive, Columbia City, Indiana 4 725 USA
web: StarlightInstruments.com
Feather Touch® Focuser Mounting Instructions
N
NEWTONIAN
EWTONIAN A
APPLICATIONS
PPLICATIONS :
:
If you have purchased a focuser to be used on a Newtonian type telescope please follow the directions for attaching the focuser to the telescope tube.
1. If you are replacing an old focuser remove the focuser and check the bolt hole pattern that is in the telescope tube. Our bolt pattern is square and measures 2.75 inches on
each side. We have supplied (4) 8-32 x .75 lg Stainless Steel Socket Head Cap screws with nuts and washers. If the tube is thicker, please contact us and we can send you
some longer screws.
2. Check the opening for the draw tube. If the opening of the draw tube is less than 2 5/8th inches you will need to increase the diameter so that the drawtube will enter
through the hole. We recommend a drum sander attachment that can be used with an electric hand drill. These are available in most hardware stores and consist of a
rubber wheel on a ¼ inch mandrel. This can be purchased in different sizes and a 1 ½ inch model will do fine. Get a few sanding belts along with this and increase the
opening as needed. Other methods may also be used but in my opinion may be more difficult.
3. If new holes are needed for the mounting screws, use the base as the template to locate the holes. The base can easily be removed by loosening the (2) -32 set screws
located on opposing edges of the base. A 1/1 Allen wrench will be needed. Drill (4) 3/1 th holes and attach the base to the telescope with the supplied hardware.
4. You can now attach the focuser back onto the base by rotating the focuser to the desired position and tightening the (2) set-screws. Finger tight will be sufficient to hold
the focuser securely in place. If the focuser needs to be repositioned at any time feel free to do so. The set-screws will leave a mark on the inside of the focuser housing
but this is unavoidable and was designed this way.
5. For both flat and curved base plates, either a 1/8 inch hex key or slotted screw driver is required to adjust leveling screws.
S
SCHMIDT
CHMIDT-C
-CASSEGRAIN
ASSEGRAIN A
APPLICATIONS
PPLICATIONS:
:
If you have purchased a focuser to be used on a Schmidt-Cassegrain (SCT) type telescope please follow the directions for attaching the focuser to the telescope.
1. Remove any threaded collars from the end of the telescope to expose the threads that are to be used with the adapter.
2. Remove the threaded adapter from the focuser by loosening the (3) -32 set screws. These can be seen on the top of the adapter opposite the large thread. No need to
remove them, two turns will be enough to pull the focuser from the adapter.
3. Screw the adapter onto the threaded end of the SCT.
4. Re-attach the focuser to the threaded adapter. Finger tight will be sufficient to hold the focuser securely in place. If the focuser needs to be repositioned at any time feel
free to do so. The set-screws will leave a mark on the inside of the focuser housing but this is unavoidable and was designed this way.
R
REFRACTOR
EFRACTOR A
APPLICATIONS
PPLICATIONS: (V
: (VIXEN
IXEN
AND
AND 3”/ 4” CNC F
3”/ 4” CNC FOCUSERS
OCUSERS )
)
For refractor type telescopes please follow the directions for attaching the focuser to the telescope.
3”/ 4” CNC Focusers
1. Remove the end cap or attachments to the telescope focuser draw tube so that the threads are exposed.
2. Remove the threaded adapter from the focuser by loosening the (3) -32 set screws. These can be seen on the top of the adapter opposite the large thread. No need to
remove them, two turns will be enough to pull the focuser from the adapter.
3. Screw the adapter onto the threaded end of the focuser draw tube.
4. Re-attach the focuser to the threaded adapter. Finger tight will be sufficient to hold the focuser securely in place. If the focuser needs to be repositioned at any time feel
free to do so. The set-screws will leave a mark on the inside of the focuser housing but this is unavoidable and was designed this way.
Vixen
1. For Vixen tubes remove the existing focuser by removing the 3 Phillips head screws that hold the focuser to the telescope tube.
2. Remove the adapter from the focuser by loosening the (3) -32 set screws. These can be seen on the top of the adapter opposite the large thread. No need to remove them,
two turns will be enough to pull the focuser from the adapter.
3. Attach the adapter with the (3) supplied Stainless Steel Button Head Cap Screws. The original equipment is metric and will not fit the adapter threads. Re-attach the focuser
to the threaded adapter. Finger tight will be sufficient to hold the focuser securely in place. If the focuser needs to be repositioned at any time feel free to do so. The set-
screws will leave a mark on the inside of the focuser housing but this is unavoidable and was designed this way.
H
HINTS
INTS
AND
AND T
TIPS
IPS
1.25” to 2” Eyepiece Adapter
If your
Feather Touch® Focuser
was ordered with a low profile adapter several points should be noted. Our adapter uses a slightly different design than has been customarily used. The intent of
this design was to use an adapter that has as low of a profile as possible. Normally 1 ¼ inch adapters use a flange on the end of the adapter so that there is room for a locking thumbscrew for the
eyepiece. However this extra distance that the flange takes up, brings the short focal length eyepieces further from the focal point. It also decreases the amount of in-travel for 1 ¼ inch eyepieces
where the extra in-travel is generally required. Our adapters provide a solution to these problems.
There are two thumb screws on the draw tube that are opposed at 120 degrees. If the 1 ¼ inch adapter is used you only need to tighten one of these thumb screws. There are two half moon cuts
on the face of the draw tube, these are used to position the adapter so that the same thumb screw that is normally used for 2 inch eyepieces can be used with the 1 ¼ inch adapter. There is a
brass guide in the adapter and a transfer plug. This plug is pushed in by the thumb screw and in-turn presses onto the brass collar of the 1 ¼ inch adapter. In order for you to capture the position of
this transfer plug a key needed to be provided on the 1 ¼ inch adapter. That’s the reason for the two half moons. The screw on the face of the adapter will key into the half moon thereby
orientating the adapter so that the transfer plug is in line. The 1 ¼ adapter should always be keyed into a position opposite the thumb screw that is to be used. They can of course be switched for
left handed use.
U n c o m p r o m i s i n g Q u a l i t y a n d C r a f t s m a n s h i p f o r t h e D i s c r i m i n a t i n g A m a t e u r A s t r o n o m e r
S t a r l i g h t I n s t r u m e n t s . c o m
FTF20FocuserInstallationWarrantySheetV1.0.odt page 1 of 2
