Orion 5520 Attaching the Filter Wheel to a Telescope, Using the 1.25 nosepiece, Using T-threads

Camera adapter

Filter wheel assembly

Digital imager

1.25" nosepiece

1.25"1.25" eyepiece adapter eyepiece

1.25" nosepiece

Thumbscrew

Filter wheel assembly

Figure 4a. The Multiple Filter Wheel with digital imager attached via T-threads.

ply thread the imager onto the camera adapter, and then thread the adapter onto the rear (labeled) plate of the filter wheel assembly (Figure 4a).

You can lock your camera or digital imager in a preferred position by using the camera adapter's locking ring. Once you have positioned your camera or imager, rotate the knurled locking ring counter clock- wise until it locks the camera or imager into place.

Attaching the Filter Wheel to a Telescope

Now that you have installed your 1.25" filters into the wheel assem- bly, it is time to attach the filter wheel to your telescope.

Using the 1.25" nosepiece

If your telescope features a 1.25” focuser, adapter, or diagonal the easiest way to attach the Multiple Filter Wheel is by using the included 1.25" nosepiece. Thread the nosepiece onto the front plate of the wheel assembly. Now simply insert the nosepiece into your telescopes’ 1.25" focuser or accessory and secure by tightening the thumbscrew.

Using T-threads

Some Orion telescopes feature focus adapters with exterior T-threads. If you are using such a telescope, you can attach the Multiple Filter Wheel directly to the T-threads without using the 1.25" nosepiece. Carefully attach the wheel to the T-threads by rotating the entire assembly clockwise until tight.

Attaching an Eyepiece to the Filter Wheel

For visual use, you will need to attach the 1.25" eyepiece adapter to the Multiple Filter Wheel. To do this, thread the 1.25" adapter onto

Figure 4b. The Multiple Filter Wheel with 1.25" eyepiece attached.

the back (labeled) plate of the wheel assembly. Once the adapter is completely attached, unscrew the knurled thumbscrew until it is flush with the inside surface of the adapter and insert a 1.25" eyepiece. Secure the eyepiece by tightening the thumbscrew (Figure 4b).

Use

The Orion Multiple Filter Wheel features a helpful number system that allows you to quickly place the filter of your choice into the light path. Simply note the reference number of each filter during installation, then rotate the knurled wheel until the desired number is displayed in the small notch in the filter wheel housing (Figure 1).

When using the Multiple Filter Wheel, you may find it useful to leave one of the five threaded filter locations empty, as it provides an unfil- tered option for viewing or imaging.

Keep in mind that use of the Multiple Filter Wheel requires 20mm of inward focus travel. This will not be a problem for most telescope designs, but could be a problem for Newtonian reflectors.

Care and Storage

Feel free to leave your 1.25" filters installed in the wheel during stor- age. To avoid excessive dust buildup, be sure to attach the dustcaps prior to storing, and use a foam-lined accessory case.

The foam-lined box your Multiple Filter Wheel arrives in also acts as a convenient storage container. Simply unthread the 1.25" nosepiece from the filter wheel and place the wheel and nosepiece in the die- cut foam. If you have the 1.25" eyepiece adapter installed, unthread it and replace with the T-thread ring. Now you can safely store your filter wheel without worrying about dust build-up on your filters.

One-Year Limited Warranty

This Orion 1.25" Multiple Filter Wheel is warranted against defects in materials or workmanship for a period of one year from the date of purchase. This warranty is for the benefit of the original retail purchaser only. During this warranty period Orion Telescopes & Binoculars will repair or replace, at Orion’s option, any warranted instrument that proves to be defective, provided it is returned postage paid to: Orion Warranty Repair, 89 Hangar Way, Watsonville, CA 95076. If the product is not registered, proof of purchase (such as a copy of the original invoice) is required.

This warranty does not apply if, in Orion’s judgment, the instrument has been abused, mishandled, or modified, nor does it apply to normal wear and tear. This warranty gives you specific legal rights, and you may also have other rights, which vary from state to state. For further warranty service information, contact: Customer Service Department, Orion Telescopes & Binoculars, 89 Hangar Way, Watsonville, CA 95076; (800)‑676-1343.