ASTRO-PHYSICS RAPAS 사용 설명서 - 페이지 4

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

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Explanation of the Push-Pull Adjustment System:

Please Notice

need to further refine its accuracy and can skip the Push-Pull adjustment described below.

Our CNC machining tolerances are measured in the 10,000ths of an inch (a very, very tiny amount). When you assemble

a number of parts, the tolerance variations are not added, but rather multiplied. Hence, the need to be able to make tiny

angle adjustments for precision. Remember, one arc second is the same as a dime placed at a distance of 2.5 miles!

Most users may never need to adjust the plate from its factory position, but the "push-pull" system is available to

allow precise adjustments.

The three set screws "push" against the rear plate of the R.A. axis. They do so to change the angle of the RAPAS

attachment plate. The three attachment screws "pull" the set screw tips tight against the rear plate in order to fix the

adjustment plate at the corrected angle.

By using the appropriate "push" screws (set screws) and "pull" screws (attachment screws) on the mount adapter plate you

will align the pole star on the polar scope reticle. It will take a little trial and error to learn which screw moves the star which

direction.

If you have multiple Astro-Physics mounts and you have made the adjustments (described below) to each of the adapters,

then you will be able to swap the RAPAS between all of your mounts with high-precision and repeatable results.

The Basics for Aligning the RAPAS Adapter and/or Polar Axis Rear Plate:

Use the RAPAS before deciding whether it is necessary to make these adjustments to the Adapter / Rear Plate.

1. To achieve the greatest accuracy, it is important to level the mount in the East-West direction. This ensures that the

RAPAS is positioned vertically (so that alignment is repeatable).

2. After attaching the adapter plate and the polar scope, use the polar scope to position Polaris (N. Hemisphere) or Sigma

Octans (S. Hemisphere) on the reticle at the proper hour angle. The mount will be quite close to polar aligned at this

point. See the following handy alignment Apps for proper Polaris (or Sigma Octans) placement:

a) Astro-Physics Polar Alignment Scope Utility - now a part of the AP V2 ASCOM driver

(you must use version v5.05.10 or later); the AP V2 ASCOM driver can be found by

linking through the AP website. The full V2 ASCOM driver needs to be installed, but

the "AP Right Angle Polar Alignment Scope" utility can be accessed as a stand-alone

application by navigating through Windows: Start → Programs → Astro-Physics →

ASCOM Driver → AP Right Angle Polar Alignment Scope.

b) iPhone/iPad/iPod Touch App - Astro-Physics PolarAlign App

c) Windows Phone App - AP Polar Align App

d) Android Phone App - Polar Finder App

3. Perform a precise drift alignment using your telescope. If your alignment is not perfect, then you will make the RAPAS

less accurate by adjusting it. Please see the following section for the preferred Drift Alignment procedure.

4. Using only the Push-Pull Screw Adjustment System on the RAPAS adapter (D

adjusters), bring Polaris (or Sigma Octans) back to the appropriate hour angle. Remember, Polaris' position is con-

stantly changing. Adjustment is made by loosening two attachment screws while pushing with its paired set screw.

Always keep one attachment screw tight so that the adjustment does not become sloppy. Note the direction of star

movement when you push with a set screw and work accordingly. Little by little you will move the polar alignment star

to its proper position. Finish by making sure that the attachment screws are tight.

After this initial drift alignment and adjustment, the mount will not need to be drift aligned again, even if the polar scope

is removed at the end of a session and replaced at the next session. The fit of the polar scope is accurate enough to re-

create the same polar alignment to a high degree of accuracy with each subsequent use. Likewise, it will be possible to

swap the RAPAS between different mounts since it is the adapter plates that makes the adjustment for each mount.

Important Reminder: The RAPAS Adapter must always remain attached to the scope. Only the RAPAS,

itself, is removed.

– The RAPAS will be VERY accurate right out of the box. Most people will find no

the mount's altitude-azimuth