Orion AccuFocus 7395 User Manual

Orion AccuFocus™
Electronic Focuser

#7395

The AccuFocus Electronic Focuser makes achieving a sharp
focus much easier, as no vibrations are imparted to the telescope
when the focusing shaft is rotated. Focusing, especially at high
magnifications, becomes simple and more precise. In fact, you
may even see image detail you have never seen before due to
“shaky” focusing by hand!

The AccuFocus fits most Orion refractors and reflectors. It also
fits several of the focusers Orion sells separately.

Parts List

Nylon
“hook
and loop”
adhesive
strip

Focuser bracket for
rack-and-pinion focuser

Cable

Shaft coupler for Crayford focuser

Motor assembly

Control box

Washers (2)

Refer to Figure 1.

Qty Description

1 Control box

1 Motor assembly
(with shaft coupler for Crayford focuser attached)

1 Cable

1 Shaft coupler for rack-and-pinion focuser

1 Focuser bracket for rack-and-pinion focuser

1 Focuser bracket for Crayford focuser

2 Thumb screws

2 Washers

4 Phillips head screws

2 Hex keys

1 Nylon “hook and loop” adhesive strip

Installation for Crayford
Focusers

If you have an Orion Crayford focuser, follow these simple steps
to install the AccuFocus. In addition to the provided hex keys, you
will need a Phillips head screwdriver.

1. Remove the focus knob from the right-hand side of the fo­cuser. This is done by loosening the set screw that connects
the knob to the focusing shaft (Figure 2). Use the supplied

1.5mm hex key to do this. After the set screw is loosened,
simply pull the knob off of the focusing shaft.

2. Remove the focuser’s locking thumb screw. This is the chrome,
knurled thumb screw that locks the focuser drawtube in place
(see Figure 2).

3. Position the focuser horizontally, as shown in Figure 3.

4. Remove the four Phillips head screws from the focusing shaft
cover plate. Use your thumb to maintain downward pressure
on the cover plate so it does not fall off when the screws are
removed (Figure 3). If the focuser drawtube rotates, that is OK.

Focuser bracket for Crayford focuser

Thumb screws (2)

Shaft coupler for rack­and-pinion focuser

Phillips head screws (4)

Hex keys (2)

Figure 1. The parts included with the AccuFocus.

Focus lock

thumb screw

Set screw

Focus knob

Figure 2. To remove the focus knob from the focusing shaft, first

loosen the set screw on the knob’s stem.

Focusing shaft
cover plate

Phillips head screws

Figure 3. When removing the Phillips head screws, use your thumb

to apply downward pressure on the focusing shaft cover plate; this
prevents the cover plate (and focusing shaft) from falling off the focuser.

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1

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IN 246 Rev D 06/11

You can reposition the drawtube later, once the focuser brack­et is connected.

5. Place the focuser bracket on top of the focusing shaft cover
plate. The holes in the bracket should line up with the holes in
the cover plate (Figure 4).

6. Use the supplied four Phillips head screws to connect the
bracket to the focuser. The screws go through the bracket and
the focusing shaft cover plate, and thread into the focuser. Do
not firmly tighten the screws yet.

7. If the focuser drawtube has rotated, rotate it back into position
now. The flat area on the drawtube should make a good con­nection with the focusing shaft (see Figure 4).

8. Now, firmly tighten the four Phillips head screws.

9. Replace the focuser’s locking thumb screw. Do not tighten the
thumb screw.

10. Position the motor so the end of its shaft coupler goes over the
exposed end of the focusing shaft.

11. Insert the supplied thumb screws, with washers attached,
through the slots in the motor’s bracket and thread them into
the focuser bracket (Figure 5). You may need to rotate the
motor to do this. Tighten the thumb screws firmly with your
fingers; you can also use a flat head screwdriver to tighten the
thumb screws.

12. Engage the motor drive to the focusing shaft by tightening the
set screw on the smaller end of the shaft coupler. Use the pro­vided 2mm hex key to do this. For the most secure connection,
make sure the coupler’s set screw seats onto the flat area of
the focusing shaft. Use the set screw from the focus knob on
the opposite end of the focusing shaft as a guide to determine
rotationally where the flat on the shaft is (Figure 6).

Note: Do not turn the focus knob manually when the motor drive
is engaged, or damage to the motor may result. Be sure to loos­en the set screw on the smaller end of the shaft coupler before
attempting to manually focus with the focus knob.

Corner
holes (4)

Focuser
bracket

Flat area on
drawtube

Figure 4. The bracket goes over the cover plate so the four corner

holes line up with each other.

Motor's bracket

Thumb screws (2)

Shaft coupler

Washer (2)

Figure 5. The two supplied thumb screws (with washers attached)

connect the motor’s bracket to the focuser bracket.

Installation for
Rack-and-Pinion Focusers

If your telescope has an Orion rack-and-pinion focuser, follow
these simple steps to install the AccuFocus. In addition to the pro­vided hex keys, you will need a Phillips head screwdriver.

1. Remove one of the focus knobs from the focuser. This is done
by removing the knob’s central Phillips-head screw, and then
pulling the knob off the focusing shaft. It may take a bit of force
to pull the knob off, as there is a glue bond that must be broken.

2. Remove the shaft coupler that comes installed on the motor
assembly. This is done by loosening the set screw on the
knurled section of the coupler and then pulling the coupler off
the motor’s shaft with a twisting motion.

3. Connect the black flexible shaft coupler to the motor’s shaft.
The end of the coupler with the smaller opening goes onto
the shaft. First, loosen the set screw and place the coupler on
the motor’s shaft. Then, rotate the coupler until the set screw

2

Set screw
on smaller
end of
shaft
coupler

Set screw on focus knob

Figure 6. When the manual focus knob is rotated so the set screw

on its stem is rotationally aligned with the set screw on the motor’s shaft
coupler, the flat area of the focusing shaft is directly under the set screw
on the shaft coupler. Tightening the set screw onto the flat section of the
shaft insures best motor engagement.