NexStar 5 5i Telescope Compatible flexible Dew Shield for
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.
Dew shield traps the air and
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.
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
Advantages of our flexible
Our flexible dew shield is made of black
close cell foam rubber material which is oil resistant, ozone resistant
and fire retardant.
The close cell foam rubber sheet a very good insulator which will maintain
temperature much longer that other plastic material.
The non-reflective flat black matt surface is essential to eliminate glare
cause by stray light.
The close cell foam rubber material is 1/8" thick, light weight, yet firm
and rigid to maintain cylindrical shape.
What is the disadvantage
of other dew shield?
I bought a dew shield that is make of flexible ABS plastics. 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
bulking 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
when I take the telescope on trips. Lastly, the edge of the dew shield
come apart when I roll up the dew shield tight.
Other dew shield that
is make of flexible plastic do not have a matt interior surface and would
reflex stray light and total defeat the purpose of have a dew shield shield.
Customers who bought Celestron NexStar 5 5i compatible Dew Shield also bought:- 2 Precision Levels for Meade & Celestron Tripods- Battery Holder for All Celestron Nexstar Telescope- Ultra Bright LED Mini Flashlight, Red