DGM Optics OA-6.5 ATS Use And Care Manual - Page 4

Browse online or download pdf Use And Care Manual for Telescope DGM Optics OA-6.5 ATS. DGM Optics OA-6.5 ATS 7 pages. Oa-series

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Last Updated 8 August 2000

The star test is the final confirmation of the correct alignment of your OA-

Series™ telescope. The test consists of centering a bright star, beginning at low

power, and observing the in and out of focus star images, then repeating the

test with progressively higher power eyepieces. In all cases, with the star

centered in the field of view, the image should be round and concentric with no

trace of astigmatism or coma, (elongation of the star image), both inside and

outside of focus. If you find that the image is not concentric when centered in

the field of view it is usually only a matter of using the "center line" adjuster on

the primary mirror cell and moving the image to the center of the field of view

until it is correct. The "center line" adjuster is the adjuster that is marked with

the small hole in the large plate of the primary mirror cell. Once you have

established the correct alignment by star testing you can note the visual position

of the secondary "sliver" and quickly perform accurate alignments. Also, be sure

that your scope has reached complete thermal equalization before performing

the star test(s). If you are confident that all alignment steps have been

completed correctly and still are not sure if the alignment is optimal please feel

free to contact DGM Optics™ for technical support.

Routine Maintenance: Cleaning the Optics

Cleaning the optics should be performed whenever the primary or secondary

mirrors have an excessive amount of foreign material on the optics, or when the

optical performance is obviously degraded due to surface contaminates. DGM

Optics uses the technique described™, but other methods may be used if

preferred.

Start by removing the primary mirror and cell from the tube assembly. Do not

remove the primary itself from the mirror cell as the method described can be

done with the mirror in place. The (3) machine screws used to secure the mirror

cell in the tube can be removed during the cleaning process.

1. Prepare a solution consisting of 20 parts distilled water and 1 part mild

dish washing soap.

2. Using, unscented, plain white, bathroom tissue, take 10-12 two-ply

sheets and fold into a square pad, then fold the square pad in half and

set on a clean oil-free surface.

3. Then, set aside 6-8 cotton balls on a clean oil-free surface.

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Alignment Part C: Star Testing

The Primary

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