Bedienungsanleitung Celestron 80LCM (Seite 20 von 35) (Englisch)

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Seeing Conditions

Viewing conditions affect what you can see through your

telescope during an observing session. Conditions include

transparency, sky illumination, and seeing. Understanding

viewing conditions and the effect they have on observing will

help you get the most out of your telescope.

Transparency

Transparency is the clarity of the atmosphere which is affected

by clouds, moisture, and other airborne particles. Thick cumulus

clouds are completely opaque while cirrus can be thin, allowing

the light from the brightest stars through. Hazy skies absorb

more light than clear skies making fainter objects harder to see

and reducing contrast on brighter objects. Aerosols ejected

into the upper atmosphere from volcanic eruptions also affect

transparency. Ideal conditions are when the night sky is inky black.

Sky Illumination

General sky brightening caused by the Moon, aurorae, natural

airglow, and light pollution greatly affect transparency. While

not a problem for the brighter stars and planets, bright skies

reduce the contrast of extended nebulae making them difﬁcult,

if not impossible, to see. To maximize your observing, limit

deep sky viewing to moonless nights far from the light polluted

skies found around major urban areas. LPR ﬁlters enhance deep

sky viewing from light polluted areas by blocking unwanted

light while transmitting light from certain deep sky objects. You

can, on the other hand, observe planets and stars from light

polluted areas or when the Moon is out.

Seeing

Seeing conditions refers to the stability of the atmosphere

and directly affects the amount of ﬁne detail seen in extended

objects. The air in our atmosphere acts as a lens which bends

and distorts incoming light rays. The amount of bending

depends on air density. Varying temperature layers have

different densities and, therefore, bend light differently. Light

rays from the same object arrive slightly displaced creating an

imperfect or smeared image. These atmospheric disturbances

vary from time-to-time and place-to-place. The size of the air

parcels compared to your aperture determines the “seeing”

quality. Under good seeing conditions, ﬁne detail is visible

on the brighter planets like Jupiter and Mars, and stars are

pinpoint images. Under poor seeing conditions, images are

blurred and stars appear as blobs.

The conditions described here apply to both visual and

photographic observations.

seeing condiTions direcTLy AFFecT iMAge quALiTy. These drAwing rePresenT A PoinT source (i.e., sTAr)

under BAd seeing condiTions (LeFT) To exceLLenT condiTions (righT). MosT oFTen, seeing condiTions

Produce iMAges ThAT Lie soMe where BeTween These Two exTreMes.

TelesCope maInTenanCe

While your LCM telescope requires little maintenance, there

are a few things to remember that will ensure your telescope

performs at its best.

Care and CLeaning oF The opTiCS

Occasionally, dust and/or moisture may build up on the lens of

your telescope. Special care should be taken when cleaning any

instrument so as not to damage the optics.

Ifdusthasbuiltupontheoptics,removeitwithabrush(made

ofcamel’shair)oracanofpressurizedair.Sprayatanangle

to the lens for approximately two to four seconds. Then, use

an optical cleaning solution and white tissue paper to remove

any remaining debris. Apply the solution to the tissue and then

apply the tissue paper to the lens. Low pressure strokes should

go from the center of the corrector to the outer portion. Do

NOT rub in circles!

You can use a commercially made lens cleaner or mix your

own. A good cleaning solution is isopropyl alcohol mixed with

distilled water. The solution should be 60% isopropyl alcohol

and 40% distilled water. Or, liquid dish soap diluted with water

(acoupleofdropsperonequartofwater)canbeused.

To minimize the need to clean your telescope, replace all

lens covers once you have ﬁnished using it. This will prevent

contaminants from entering the optical tube.

CoLLiMaTion

The optical performance of your LCM telescope is directly related

to its collimation, which is the alignment of its optical system. Your

telescope was collimated at the factory after it was completely

assembled. However, if the telescope is dropped or jarred

severely during transport, it may have to be collimated. The LCM

60, 70, 80 and 90 are two refractor type telescopes that have

The view oF A coLLiMATed TeLescoPe As seen Through

The Focuser oF The LcM 76/114 reFLecTor TeLescoPe.

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