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REMOVING RA MOTOR ASSEMBLY: To remove the RA motor and

electronics assembly from the mount, you must remove a

single cap screw from the bottom of the mount casting.

There is a recessed hole with one hex cap screw that holds

the entire assembly on (4.5mm Allen wrench). Motor cov-

ers can be removed for inspection, cleaning, and parts align-

ment. While its off, worm gear block can also be adjusted

if necessary for backlash. Be careful, as this may invali-

date your warranty (always check with Meade first if you

are not sure).

Courtesy of: CS Otto

HOW TO USE THE SETTING CIRCLES: Point at a Star you know.

Spin the RA circle so that the stars RA is marked by the

pointer. When you wish to move to another star, hold the

circle steady, and move the telescope (which carries the

pointer) until the pointer points at the new stars coordi-

nate.

On -some- models of telescope, the numbered circle moves

with the scope, and the pointer remains steady. But the

principle is the same. You only set the RA circle when

youre about to change targets. While youre watching the

target, the circle setting may become inaccurate (it varies

between telescope models).

Courtesy of: Dick Seymour

Miscellaneous Hints & Suggestions

These entries are in no particular order. They include posts

from the LXD55 Yahoo! User’s Group (with permission), andlist

the contributor’s name if he or she so desires. You will see

redundancies occasionally, but we’ve found that most are

worth repeating. If you’d like to contribute to this (or any other)

list, please send us an e-mail with a subject heading of “LXD55

Database”, and we’ll consider it! Thanks!

EYEPIECE / EXIT PUPIL LESSON: In general, most people under

30 years of age can dilate their pupils as much as 7mm in

full darkness. People over the age of thirty start to lose the

ability to dilate their pupils as much. For someone of age

40 or more, 5mm is a often as far as their pupils will di-

late.

If the exit pupil of a telescope / eyepiece is larger than the

amount the observer can dilate their pupils, then the ex-

tra light is not making it into their eye and is being wasted.

The exit pupil of a telescope / eyepiece is most easily cal-

culated by dividing eyepiece size (in mm) by the f/ratio of

the scope.

The f/4 SNTs come standard with a 26mm eyepiece. Di-

vide that by 4 and you have a 6.5mm exit pupil. This is

over the limit for eyes 40+ years old, but younger eyes can

often dilate this much, or even a little more.

Nothing terrible happens to the image if you exceed the

size that your pupil can dilate. Ive used a 32mm UO

Widescan eyepiece on my 8" LXD55. This yields an exit

pupil of 8mm and a magnification of just 25x. This eye-

piece has an 84 degree apparent field of view and gulps in

an incredible chunk of sky with this scope. I put a 2" Orion

Ultrablock filter on this eyepiece and observed almost all

of North American Nebula in one field of view! This is some-

thing Ive never seen in any of my scopes, or anyone elses,

in 12 years of deep-sky observing.

In general Id agree that using too large of an eyepiece on

a scope with a fast f/ratio is a waste of light... but its not

necessary to get preoccupied with that as a rule that should

never be broken

Courtesy of: Greg Granville

FINDER BRACKET SLIPPING ON OTA?: I have found you can

buy sheets of thin rubber at Lowes. I cut an oversized

square, punched holes for the mounting bolts, and mounted

the finder over this and tightened it down. Now the finder

base is rock steady.

Courtesy of: Michael Good

EYEPIECES & FAST OPTICAL SYSTEMS: The 8" and 10" are fast

f/4 scopes. That means a fat optical path, which doesnt

work as well for Orthos and Plossls. Axioms, Radians, Pen-

tax XL, Nagler, Meade UWA, etc. will run better with the

fast scopes.

Courtesy of: CS - Otto

FREEWARE FOR CONTROLLING THE LXD55: Cartes Du Ciel

(Free) works great from laptop to control my LXD55 AR5.

I click on an object on the screen choose GOTO and the

scopes slews to it. After the Autostar beeps, I get up and

theobject is within the field of view of my 15mm TV Plossl.

Cant beat that !

Courtesy of: Mickey Smith

WORRYING ABOUT THE SUN AND DAYTIME GOTO’S: Leave the

front cover on until the GoTo has Got There. If you dont

have a nose-cover for the LXD (or dont want to fight it), a

shower cap will do (used for years on a 6"). Dont forget to

cover the front of the -finder-, too. p.s. If you PARK when

you power off (Utilities > [scroll up twice] Park Scope [en-

ter], it will -not- request to be aligned the next time you

power up. Itll go straight from Daylight? to Object.

BASIC INFO ABOUT RIGHT ASCENSION: RA values increase as

you arc from the west to the east (RA values are in Hours

and Minutes). The RA of the stuff rising on the eastern

horizon is *increasing* with time... so the stuff rising 5

minutes from -now- will have an RA value which is 5 RA

minutes greater that whats there -now-.

Pick a star, any star (old magicians trick)... lets say Arc-

turus (almost overhead in the early evening in summer)...it

is at about RA 14:20. *THAT* is where RA=14:20 is... and

as the evening progresses, RA=14:20 will remain with Arc-

turus... moving westward across the sky.

Come back in 2 months... Arcturus will be much closer to

the western horizon at 9pm... but it will still be RA=14:20.

Overhead two months from now will be roughly RA=18:20

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 16 17 18

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