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Celestron NexStar 4 4GT compatible Dew Shield

Celestron NexStar 4 4GT Telescope compatible flexible Dew Shield.
Celestron NexStar 4 4GT compatible Dew Shield
 
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Celestron NexStar 4 4GT compatible Dew Shield


Celestron NexStar 4 4GT compatible Dew Shield
(Celestron NexStar 4 Dew Shield)
Ready To Order?
(Celestron NexStar 4 Dew Shield)
List Price: $22.50
Our Price: $18.00
You Save: $4.50 (20%)

Item in stock!

 

Dew Shield for Celestron NexStar 4 4GT Telescope

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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

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.

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.

Advantages of our flexible dew shield

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.

You need a flat black non-reflective surface
This is a light reflection and glare comparison 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 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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Celestron NexStar 4 4GT compatible Dew Shield Related Products :
Category : Celestron Dew Shields
Category : Flexible Dew Shields

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Celestron NexStar 4 4GT compatible Dew Shield

Celestron NexStar 4 4GT Telescope compatible flexible Dew Shield.
Celestron NexStar 4 4GT compatible Dew Shield
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