ASTRO-PHYSICS RAPAS 사용 설명서 - 페이지 6

{카테고리_이름} ASTRO-PHYSICS RAPAS에 대한 사용 설명서을 온라인으로 검색하거나 PDF를 다운로드하세요. ASTRO-PHYSICS RAPAS 6 페이지. Right-angle polar alignment scope

페이지 인쇄

It is not necessary to be super precise (round seconds to nearest minute). The LST can be obtained from your GTO

Keypad. Go to the Main Menu screen and press button "4". The LST appears at the bottom of the screen. Use that LST

time and subtract 2h 48m 54s (Polaris JNOW R.A.) and position Polaris on the RAPAS reticle at the hour angle that is your

answer.

Example: 5h 53m 54s (LST) – 2h 48m 54s (Polaris R.A.) = 3h 5m 0s (Polaris on reticle H.A.)

Practice performing the calculation while you are at home with your computer or smart device and then check your answer

to ensure that you understand the process.

Focusing Procedure

The RAPAS is pre focused before it is shipped. However, it may need to be tweaked when set up for use, depending on

the individual's eye. The following instructions will make focusing an easy and quick process. Reference the illustration

below.

1. Rotate the focusable eyepiece until the reticle lines look sharp to your eye. This step can best be done during daylight

or while looking at an artificial light source. This must be done first before proceeding.

2. Install the RAPAS and look at Polaris or firmly rest the RAPAS on a steady support and look at any bright star to deter-

mine if the star appears to be in sharp focus. If it appears to be sharp, then you are done; if not, please proceed to the

next step.

3. If the star does not appear to be sharp after adjusting the focus in step 1, then you can tweak the infinite focus by ad-

justing the front optical tube that inserts into the mount. Loosen the knurled ring that holds the front optical tube, then

turn the tube, screwing it in or out to focus. Retighten the knurled ring and you are done.

Realigning the Reticle's North-South Orientation

The Right-Angle Polar Alignment Scope is sent to you pre-aligned. However, due to shipping or other eventualities, there

may be times when it loses its alignment. Do not fret, as it is a simple procedure to reposition it.

In the illustration to the right please notice the screw at the back of the scope

ominously labeled "Do Not Loosen Screw". This will be your chance to strike out

against the establishment and defy the rules! Loosening this screw allows the

entire lens/reticle assembly to rotate. Note: some models may have a second

screw in the front.

1. The procedure is simple, but needs to be done at night when you are able to

see Polaris in the reticle.

2. Be sure that your mount is level east-west.

3. Use your azimuth adjuster to move Polaris to the center of the reticle.

4. Slightly loosen the forbidden "Do Not Loosen" screw(s) so that the assembly

can be rotated to orient the reticle.

5. Using your altitude adjuster knob, raise and lower the mount so that Polaris moves up and down. The idea is that when

Polaris travels up and down along the line by changing the altitude adjuster only, then the line is oriented exactly north-

south.

6. The "Do Not Loosen" screw(s) can now be tightened and all will be as it once was.

Changing the Illuminator Batteries:

The illuminator ships with two GPA76 button-style batteries pre-installed.

These are 1.5 volt alkaline batteries that can be found under different

manufacturer product numbers through cross reference charts. When

the need arises the batteries can be easily changed by unscrewing the

two halves of the illuminator where the tapered section joins the slender

section. Please see photo at right. The batteries are both inserted into

the narrow section with the negative (-) side towards the eyepiece and the

positive (+) side towards the tapered On/Off switch.

Eyepiece - focusable

with reticle

Illuminator - adjustable

brightness

Attachment Thumb

Screws (3)

Optical Tube with

25 mm f/8 lens

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