Flexible dew shield for Telescope, close cell foam rubber- advantage
Flexible dew shield for Celestron Nexstar Telescope by ATOZstars is made
of black close cell foam rubber material which is oil resistant, ozone
resistant and fire retardant. Flexible dew shield for Celestron Nexstar
Telescope by ATOZstars will maintain temperature much long than dew shield
made with hard plastic because the close cell foam rubber sheet is a very
good insulator.
Flexible dew shield for Celestron Nexstar Telescope by ATOZstars has non-reflective
flat black matt surface which is essential to eliminate glare cause by
stray light. Flexible dew shield for Celestron Nexstar Telescope by ATOZstars
uses close cell foam rubber material, 3/16" thick, light weight,
yet firm and rigid to maintain cylindrical shape.
Flexible dew shield for Telescope, ABS plastic
sheeting-disadvantage
Flexible dew shield for Telescope that is made of flexible ABS plastics
sheeting has many disadvantage. This type of Flexible dew shield for Telescope
works well except that it is difficult to store. . Flexible dew shield
for Telescopes that is made of plastic sheeting can be lay flat when not
in use. However, it is too long laying flat. Plastic sheeting Flexible
dew shield for Telescope are also too bulking when rolled up. It will
not fit in most telescope hard case. There is no good way to store this
type of Flexible dew shield for r Telescopes. Lastly, the edge of the
dew shield come apart when these type of dew shield is roll up tight.
Flexible dew shield for Telescope that is make
of plastic sheeting may not have a matt interior surface and would reflect
stray light. A reflective surface of the plastic sheeting Flexible dew
shield for Telescope would totally defeat the purpose of have a dew shield
shield. This property is especially important if the Flexible dew shield
for Telescope is to be use as a lens shade.
How dew forms?
When air temperature drop to a certain point at which moisture in the
air condense on cool surface. The temperature when 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
at cold nights. 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.
How does Dew Shield Work?
Dew Shield traps stagnated air in the front of the telescope. The temperature
of the stagnate air is slightly higher and prevents dew from forming.
This slight different in temperature is enough to stop the dew from
forming. The insulating property of the dew shield becomes important
because it can maintain the temperature longer.
Dew shield can also be use as a lens shade to blocks stray light from
entering the telescope. Stray light lowers the contrast of the viewing
image. This is especially obvious and important in daylight torrential
viewing.
You need a flat black non-reflective
surface
This is a light reflection and glare comparision
of the interior surface of our dew shield and other flexible ABS
dew shield.
The flat black surface on the right is our dew shield. No reflection,
no glare.
The shinny, reflective surface on the left is a flexible ABS plastic
dew shield. Lot of reflection and glare.
Roll up tight for easy storage
Our Flexible dew shield for Celestron Nexstar
Telescope can be roll up tightly for easy storage.
Other dew shield that is made of flexible ABS plastic can not be rolled
up tight and would cause the edge to come apart!
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