I bought my Meade ETX-125EC used on ebay. A
dew shield was included in the deal. It is made of flexible
hard plastic and forms the dew shield with Velcro strips.
This dew shield works well except that I have no where to
store it. It can be lay flat when not in use. However, it
is too long laying flat, too bulky when rolled up. It will
not fit in my telescope hard case. There is no good way to
store this dew shield. I end up leaving this dew shield home
when I take the telescope on trips. Other dew shields that
are made of hard plastic have the same storage problem. It
is not convenient.
What if I can make a dew shield similar to the
design but also allow me to take the dew shield with me? What
if I can make it to fit in my hardcase. What if I make it
so it would protect my telescope when not in use? What if..What
if, so I made one that will fit in my hardcase and protects
my telescope when not in use. Protector Dew shield is invented.
The Dew Shield telescope Protectors are compatible with Meade
Dew Shield #670 #673 #675 #678 for Meade ETX-90EC, ETX-105EC,
ETX-125EC telescopes
Dew Shield traps stagnated air in the front of the telescope.
The temperature of the stagnate air is slightly higher than
ambient temperature and thus prevents dew from forming. This
slight different in temperature is enough to stop the dew from
forming.
How is dew formed?
When air temperature drop to a certain point
at which moisture in the air condense on cool surfaces. The
temperature at which dew start forming is called the dew point.
The condensed moisture as water droplet is dew. Dew is what
prevents you from enjoying star gazing with you telescope.
As long as the temperature is below dew point, dew will continue
to form on your telescope no matter how often you wipe the
telescope.
Flexible Dew
Shield/Scope Protector in the retracted Position
Flexible Dew
Shield/Scope Protector in the extended Position
Yes! my ETX-125EC has both the 90 degree
and straight through viewfinder and Electric focuser.
How to prevent dew on you telescope?
Use a dew shield
Use a "Dew Heater"
which uses electrical power to raises the temperature
of the front lens of the telescope.
How does Dew Shield telescope Protector for Meade Telescopes
work?
Dew Shield traps stagnated air in the front of the telescope.
The temperature of the stagnate air is slightly higher than
ambient temperature and thus prevents dew from forming. This
slight different in temperature is enough to stop the dew
from forming.
Advantages when using a Flexible Dew Shield
telescope Protector for Meade Telescopes
Prevent dew condensation allow you to enjoy
star gazing.
Blocks stray light from entering
the telescope. Stray light lowers the contrast of the
viewing image. Blocking out stray light will increase
the image contract. This is especially obvious and important
in daylight viewing. It improves astronomical viewing
and astronomical photographic contrast from city observing
sites by blocking neighboring stray lights. It also gives
a considerable improvement in contrast during daytime
terrestrial viewing and is highly recommended for daytime
terrestrial photography.
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