AmScope TLS-70900 사용 설명서 - 페이지 11

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Dealing with dew

Here are a few options:

•

Dew Shield: These optical tube extensions fit over the front end of

the telescope and delay the ability for dew to form on the optics.

You can buy flexible dew shields that wrap around your telescope's

outer diameter and will lie flat when not in use or flexible heated

dew shields that will raise the dew point of the surface to keep dew

away. Choose a dew shield that is made to fit your telescope, or

measure the outside diameter of the telescope and buy according to

those dimensions.

•

Dew Strips: Dew heaters, or dew strips, are thin strips of a thick

material that have heater elements running along their length. They

wrap around the outermost edge of the telescope tube, stay put

thanks to Velcro, and plug into a hand controller, which allows you to

adjust the amount of heat applied to the surface. Dew Controllers

often are capable of handling more than one heater, so you can

have one for your telescope, one for your finder, or any other number

of accessories. Keep in mind that dew heaters and their controllers

require DC power, so when considering them, think about how they

will be powered.

•

Hairdryer: Many people use a hairdryer to blow away the dew. If you

choose this method, keep in mind that you always want to use the

LEAST amount of heat required to do the job. Overheating your

mirror will only cause distortions of your image until the glass returns

to ambient, and then the blow dryer is needed again. This is why

most people use heater strips made for the purpose. They can be set

to provide just enough heat to do the job, and only around the

perimeter of the mirror, limiting the amount of heat distortion they

cause.

Prepare your stuff in advance

Whether you are driving to a dark-sky location or are observing in your

backyard, it makes sense to make sure you collect everything you will need

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for an evening under the stars before you head outside. Some people find

it works best to make a list and keep it near your telescope. Others keep

everything they need in accessory cases for quick and easy access. Whichever

organizational method you choose, keep in mind that it is better to bring

everything out at once than to keep going back into the house and subjecting

your eyes to white light, or worse yet, not have what you need when you are

miles away from home. Don't forget your red flashlight, remember to bring

extra batteries, and pack some coffee or hot cocoa while you're at it!

Red Flashlight

A red flashlight helps you see star charts and equipment in dark surroundings

with minimal impact on your night vision.

Artificial light is the enemy of amateur astronomers. When you are out

observing faint celestial objects, you need your eyes to perform at their best,

and that can only be accomplished when your pupils are as dilated as much

as possible. Our pupils dilate to allow us to see better in the dark, and any

white light that interferes with that process also interferes with our ability to

see details in the dark.

Red light is a lot friendlier to your night sight than white or yellow light, but it

still has some impact.

You need to use it judiciously and not keep it on all the time, as it can lower

your chances of observing faint deep sky objects. To minimize that impact,

turn the red flashlight on when you need to check a star chart or to adjust your

telescope or binoculars, but leave it off otherwise.

Cooling the telescope

Telescopes require at least 10 to 30 minutes of cooling down to outside

air temperature. However, this may take longer if there is a big difference

between the temperature of the telescope and the outside air. This minimizes

heat wave distortion inside the telescope tube.

Use this time for planning your session and mounting accessories.

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