ORION TELESCOPES & BINOCULARS 07790 Instruction Manual page 3

Inspection & Maintenance
Pinholes and scratches are common in all glass solar filters.
Microscopic particles on the glass can not be completely
eliminated in the coating process, and a minute amount of
light transmitted through the resulting "pinholes" will be vis-
ible. Normal usage of the filter will reveal new pinholes and
may also introduce small scratches.
Every effort is made to minimize pinholes in the manufactur-
ing process. The glass is cleaned and coated three times in
the coating process, meaning that the coating is even across
the entire aperture and most pinholes will not be entirely
transparent.
A few minutes spent occasionally touching up any brighter
pinholes will prevent any possible "ghosting" due to scattered
light. Opaquing of the pinholes should be done on the inside
coated surface with a fine-point "permanent" felt marker.
Although it would never be necessary with our filters, as
many as 20 touch-ups per inch of aperture could be done
without loss of resolution or significant loss of brightness.
All filters are tested for safety before shipment. There is no
danger if a few small pinholes or minor scratches are pres-
ent, although we recommend opaquing all visible ones. The
opaquing procedure will not lessen the optical performance.
Light loss is not a problem since only about 1/1000th of 1%
of light is transmitted anyway!
This Orion product is warranted against defects in materials or workmanship for a peri-
od 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 defec-
tive, provided it is returned postage paid. Proof of purchase (such as a copy of the origi-
nal receipt) is required. This warranty is only valid in the country of purchase.
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. It is not intended to remove or restrict your other legal rights
under applicable local consumer law; your state or national statutory consumer rights
governing the sale of consumer goods remain fully applicable.
For further warranty information, please visit www.OrionTelescopes.com/warranty.
A N E M P L O Y E E - O W N E D C O M P A N Y
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may be reproduced, copied, modified or adapted, without the prior written consent of Orion Telescopes & Binoculars.
One-Year Limited Warranty
Solar Photography
By attaching a camera body to a telescope, in effect using
the scope as a telephoto lens, you can take striking pho-
tographs of the Sun. Only attempt this if the telescope is
equipped with the proper solar filter.
Solar filters are coated to a neutral density of 5, which reduc-
es the light about 100,000 times. Depending on the aperture
and focal length of your telescope and "seeing" conditions,
you will need to experiment to find the best exposure time for
your equipment.
Do not be discouraged if your first attempts at solar are less
than desired. The Sun is very difficult to image because of
poorer "seeing" conditions caused by unavoidable heat cur-
rents associated with daytime viewing. The highest possible
resolution for any land-based telescope, regardless of loca-
tion, is about 1 arc second. Ideal seeing for any location will
be available less than 5% of the time. It may be some con-
solation to consider that your results could equal those at
professional observatories, as larger apertures and location
have little, if any, advantage. During bad seeing conditions,
it may help to "stop down" apertures over 5" with an off-axis
mask.
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