William Optics RedCat 51 User manual

INSTALLATION GUIDE: REDCAT51, EAF, ASIAIR BRACKET

Tools you’ll need:
● 2mm Hex Key
● 2.5mm Hex Key
Step 1
Using your 2.5mm hex key, remove the two screws from the saddle, and place it to the side.
These screws will be replaced with screws in the kit, so I suggest storing them in a safe place,
just in case you want to bring the telescope back to its default configuration.

Step 2
Place the Electronic Auto Focuser (EAF) in the bracket. The fit should be kind of snug, this is
intentional. Once the holes are lined up, use the 2 screws that came with your EAF to secure it
to the bracket, using your 2.5mm hex key. The screws should be snug, but don’t need to be
overly tight.

Step 3
Using your 2.5mm hex key, remove the 2 screws that hold the dovetail. Keep these 2 screws
handy as we’ll be using them in the next step.

Step 4
Using the two screws from step 3, secure your ASIair Pro or Asiair Plus using your 2.5mm hex
key.

Step 5
Remove the dew shield by spinning it to the left. It might be a little snug depending on
temperature. If you can’t get it off, it’s best to bring it inside and let the telescope warm up a little
bit.

Step 6
Slide the large gear over the front of the telescope and down the focuser. You should feel some
resistance when sliding it over the rubber part of the focuser, this is by design. I’ve found that
rocking it side to side while pushing it down works the best. You’ll want to slide it most of the
way down, but make sure it’s still on top of the raised pieces of rubber. We’ll adjust this in
towards the end, so it’s not a huge deal right now.

Step 7
Place the assembled adapter on top of the telescope and mount it using the supplied M4x8 (the
smaller of the two sets of screws) and your 2mm hex key. Note: the image above shows phillips
head screws, we’ve since replaced them with 2mm hex screws, but the process is still the same.

Step 8 (Optional)
If you plan on using the saddle (optional), mount it onto the top of the bracket using the supplied
M4x14 screws (the larger of the two sets of screws), and your 2.5mm hex key.

Step 9
Align the small gear shaft with the shaft of the EAF. The gear will have a notch in it, so it can
only fit onto the EAF shaft one way. You can either look at it and try and line it up, or push the
gear against the EAF shaft, and slowly rotate it until it lines up and slides on. Push the gear
firmly onto the EAF. Note that you might have to rotate the large gear slightly in order to get the
gears to mate correctly. Once you’ve pushed the small gear into place, you can now align the
large gear with the little gear.

Step 10
Screw the dew shield back onto the front of the telescope. Your setup is now complete.

Optional:
If you find that the fitment of the focus ring is a little too loose, you can locate, and tighten the
silver grub screw using a 1.5mm hex key, until it’s snug. You don’t have to over tighten the grub
screw. It should be just tight enough that your focus ring doesn’t slip. If your focus ring doesn’t
contain a grub screw, contact us and we’ll send you the updated version.