Eagle Mach 1 Especificaciones descargar pdf (Pagina 17)

It is possible to use an older model polar scope (PASILL or PASILL2), but they may be a bit less accurate. To use

one of these earlier polar scopes, screw the unit into the adapter, and then back it off to align Polaris’ relative

position to the pole. Proceed normally turning the polar scope wherever the instructions say to turn the RA axis.

Since the scope won’t be screwed in tight, you may have a bit of sag that will slightly reduce your accuracy.

• GTO Keypad – Please refer to the instruction manual for the GTO Keypad and read the sections from “Getting

Started” through “Alternate Polar Calibration Routines & Tips.” Also, be sure to read the Keypad Version 4.17

Addendum. Here are summary descriptions of several techniques for polar alignment from the Keypad Manual and

Addendum.

o The Keypad startup routine provides two methods: The North Polar Calibrate and the Two Star

Calibration. These two polar alignment methods were really designed for quick coarse alignment in the

field with portable setups. They are most appropriate for visual observers. The Two Star Method is

generally the better of the two as it is less affected by orthogonality issues.

o The Daytime Routine (See “Polar Aligning in the Daytime” ), is a great trick for daytime setup. In addition,

it is the recommended first step in alignment for anyone in the southern hemisphere, and for owners of the

3600GTO. Even those in the south who own our polar scope will find it helpful, since it will generally put

the rather difficult-to-spot southern stars into the polar scope’s field of view.

o The original GTO Quick Star Drift Method of Polar Alignment that takes advantage of the Meridian Delay

feature of the Astro-Physics Servo System is also included in considerable detail in the Keypad Manual. A

table of suggested stars is found in Appendix I of the manual.

o Saving the best for last, we have also included a second Revised GTO Quick Star Drift Method that was

conceived for use with a finder scope. This method is detailed in the Keypad Version 4.17 Addendum and

includes a one-page Quick Reference Sheet to use once you are familiar with the method. By using a

finder scope, you are able to remove orthogonality issues from the process, making subsequent

alignments much easier.

For our testing purposes here at Astro-Physics, using one of the first production 3600GTO’s, we obtained

accurate enough polar alignment for extensive imaging (with a focal length of 3810 mm!) using the Daytime

Routine, followed by the Revised GTO Quick Star Drift Method, and did so in less than one half hour! The

combination of Daytime Routine followed by the Revised GTO Quick Star Drift Method is our

recommended procedure for anyone in the southern hemisphere, or anyone who finds their view of the

pole obstructed.

• Computer Software Solutions – There are many software packages that include aids to polar alignment. Some work

better than others. Most of them have shortcomings, especially if there is any orthogonality error or flexure in your

system. We have seen customers practically tear their hair out trying to get good alignment using software. Do not

be fooled into thinking that your alignment is perfect simply because a piece of software told you so. Polar

Alignment is, after all, entirely a mechanical issue. With the creation of the Revised GTO Quick Star Drift Method,

Roland and other staff members here at Astro-Physics no longer even bother with software for polar alignment.

Having said that, here are some of the software options that are available:

o We suggest that you refer to detailed instructions in the GTO Keypad manual for a method that utilizes

CCDOPS from Santa Barbara Instrument Group (SBIG) for precise polar alignment. This method is

basically traditional drift alignment with CCDOPS and your camera precisely measuring the drift for you.

o There is a Polar Alignment Wizard in the Full Version of PEMPro 2.x. Owners of the Mach1GTO can

purchase PEMPro from our website or from the the CCDWare website:

www.ccdware.com This wizard

is quick and easy and gives excellent results! Details are in the PEMPro documentation.

o There are also other similar alignment procedures, including one in MAXIM DL from Diffraction Limited.

Numerous other software solutions are also available.

• Star Drift method – Traditionally, this very time-consuming procedure has been regarded as the most accurate

method of polar alignment. However, if you are using the old method of drift alignment (star near eastern horizon,

etc), you are doomed to failure. To obtain more accurate results, choose stars somewhere near the celestial

equator due south or slightly east and west, but not below 45 degrees elevation. If you attempt to drift align below

that, you will encounter atmospheric refraction, which skews your alignment.

For portable setups, we believe that our two GTO Quick Star Drift Methods are much more practical approaches in

terms of providing highly accurate alignment and still leaving enough time to actually get some imaging done. A

permanent observatory setup where long unguided exposures are taken may still benefit from a final tweaking using

the traditional star drift method.

• Helpful Advice – Members of the ap-gto Yahoo group occasionally discuss alternative methods of polar alignment

that they have found helpful. We suggest that you participate in this Internet discussion group. Follow the links from

the sidebar of our website to find the group.

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