Orion 5520 User Manual

Orion, 25" multiple filter wheel

IN 313 Rev D 10/10

Orion

1.25" Multiple Filter Wheel

#5520

Congratulations on your purchase of a quality Orion accessory. The
Orion Multiple Filter Wheel allows use of up to five 1.25" filters without
the time-consuming and sometimes frustrating process of removing
an eyepiece or imaging system every time a different filter is needed.
With its innovative design and compatibility with 1.25" Orion filters,
the Orion Multiple Filter Wheel lets you dial in the details of virtually
any celestial object with a simple turn of the wheel.
Parts List
1

Filter wheel assembly

1.25" nosepiece

Camera adapter

1.25" eyepiece adapter

Hex key

Filter Installation
Use the supplied hex key to unthread the four socket head screws of
the front (non-labeled) panel of the filter wheel assembly (Figure 2).
Be sure to place the screws in a safe place so they do not become
lost. Once all four screws have been removed, gently separate the
front plate from the filter wheel. Install the 1.25" filters of your choice
into the tray simply by threading them into the filter tray. You may
wish to note the number designation of each installed filter for conve-
nient reference during use. You may find it useful to leave one of the
five threaded filter locations empty, providing an unfiltered option for
viewing or imaging. Once you have installed all the filters you wish to
use, carefully place the filter tray back into the wheel assembly. Be
sure the small plastic tab fully registers with the central hole of the
wheel assembly so that it “clicks” into place. Position the rear plate
so that the opening is aligned with the opening of the front plate.
Complete installation by reattaching the rear plate of the filter wheel
assembly with the socket head screws.

If you are installing an individual filter or swapping one filter for anoth-
er, you can avoid partial disassembly of the filter wheel. To install
an individual filter, unthread the 1.25" nosepiece from the assembly
to expose the internal filter tray. Rotate the tray so the desired filter
location is shown. Install the 1.25" filter by placing it on the filter tray
and rotating it clockwise with your fingertips. Orion 1.25" filters fea-
ture a knurled rim which will prove helpful for this type of installation.
Be careful not to touch the actual filter surface. Note: individual filter
installation without disassembly may not be convenient for all users,
especially those with large fingers!
Attaching a Camera to the Filter Wheel
The Multiple Filter Wheel can be extremely useful for astro-imaging
with a camera body, be it a SLR camera, CCD, or CMOS device. To
attach a SLR camera to the filter wheel, use the included camera
adapter and an optional T-ring for your SLR model. Attach the side of
the camera adapter without the knurled lock ring to the rear (labeled)
plate of the wheel assembly by rotating it clockwise until tight. Now
thread your SLR camera T-ring onto the exposed T-threads (Figure 3).
Note: The filter wheel arrives with the camera adapter pre-
installed.
If you are using a digital imager that features T-threads, you can
attach it directly to the Multiple Filter Wheel. If your digital imager
has a 1.25" nosepiece, remove it to expose the T-threads. Now sim-

Figure 1.

The Multiple Filter Wheel

Filter wheel assembly

1.25" eyepiece adapter

1.25" nosepiece

Camera adapter

Hex key

Figure 2.

Partial disassembly of the filter wheel.

Front panel

Hex key

Notch

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Corporate Offices (831) 763-7000
89 Hangar Way, Watsonville, CA 95076

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Providing Exceptional Consumer Optical Products Since 1975

Figure 3.

Attaching the camera adapter.

Filter wheel

assembly

to camera

T-ring or

imager

Knurled

lock ring

Camera adapter

1.25" nosepiece