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One-Year Limited Warranty
This Orion High-Power Barlow 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 war-
ranty 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.
Power Limitations
While a Barlow lens will increase the magnification of a telescope, there is a limit to how
much magnification is useful. It depends on the telescope’s aperture, the quality of the
optics, and on the outdoor “seeing” conditions, which vary from night to night. Keep in
mind that using the 3x or 5x High-Power Barlow may exceed the maximum practical
magnifying power of your telescope and eyepieces.
Generally, the maximum practical magnification a telescope can deliver is about 50x per
inch of aperture (diameter of the main lens or mirror). Any higher and the images seen
will likely just be blurry and dim. Seeing conditions (i.e., steadiness of the atmosphere)
often limit the useful magnification to much less than 50x per inch of aperture. If you are
using a High-Power Barlow for planetary imaging with a webcam or special planetary
camera, you can benefit from “oversampling” by increasing the magnification higher than
you typically would for a sharp image. Digital processing will allow you to sharpen the
image and reveal extraordinary detail.
Care of Your Barlow Lens
Care should be exercised when using all optical and mechanical telescope accessories.
Keep your Barlow in a protected environment when you’re not using it. Avoid touching
the lenses and coatings. If the outside of the lens should become dirty, you may want
to clean it. Blow off all loose dirt with a blower bulb. Use only optical lens tissue and
good-quality lens fluid. Wet a folded tissue and gently wipe the surface of the lens.
Immediately use a second piece of lens tissue to gently dry the lens off. Do not rub or
apply pressure, as this may scratch the lens if dust or grit is present.
It is recommended to keep the plastic plug in the top of the Barlow and the cap on the
end of the barrel when the Barlow is not in use.
