Manual Meade ETX-90AT (page 44 of 60) (English)

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#64 T-Adapter: The basic means of photography through any ETX Astro telescope,

the #64 T-Adapter threads to the rear cell of the telescope, followed by a T-Mount

appropriate to the user’s brand of 35mm camera. In this way, the camera body is

rigidly coupled to the telescope's optical system, which in effect becomes the camera's

lens (see

PHOTOGRAPHY, page 40).

#932 45° Erecting Prism: All ETX models include an internal optically-flat mirror to

reflect light to the telescope’s 90° astronomical observing position. In this position the

telescope’s image is upright, but reversed. For terrestrial observing with an ETX

model, the #932 Erecting Prism (

Fig. 37) correctly orients the eyepiece image and

provides a convenient 45° observing angle.

#774 Hard Carrying Case (for the ETX-90AT), #776 Hard Carrying Case (for the

ETX-105AT) and

#775 Hard Carrying Case (for the ETX-125AT): For secure

portability of ETX Astro Telescope models in the field, Meade hard carrying cases (

Fig.

) are fully lined with fitted foam inserts. They accept the complete ETX Astro

Telescope plus optional accessories.

#765 Soft Carry Bag: The Meade soft-padded carry bag (Fig. 39) is well suited to

travel with the ETX-90AT Astro Telescope. Each carry bag includes a shoulder strap

and permits ready transport of the complete telescope, including accessories.

Power Adapters and Cords: In addition to their internal battery packs, ETX-90AT,

ETX-105AT, and ETX-125AT telescopes may be powered from standard 115vAC

home electricity with the

#541 AC Adapter. The #541 plugs into any standard home

outlet and includes a 25 ft. cord connecting to the telescope’s control panel. Input

voltage to the telescope is 12vDC. Alternately, an ETX telescope may be powered in

the field from an automobile cigarette lighter plug by using the

#607 Power Cord, a

25-ft. cord that plugs into the telescope’s control panel and supplies 12vDC directly

from the car battery.

#1244 Electric Focuser (for the ETX-90AT and ETX-105AT) and #1247 Electric

Focuser (ETX-125AT):

Meade-engineered for smooth, rapid focusing with any

ETX model, each electric focuser (

Fig. 40) includes coarse and micro-fine speeds. The

standard-equipment hand controller accepts one (user-supplied) 9-volt battery and

focuses the ETX telescope. On the ETX models, the focuser plugs into and is

Autostar or the optional #497 Autostar Computer Controller.

#887 Advanced Field Tripod for the ETX-105AT or ETX-125AT: For extra stability in

sensitive applications of the ETX-105AT or the ETX-125AT even at the highest mag-

nifications, the fixed height #887 Tripod permits either altazimuth or

equatorial orientation of the telescope for astronomical or terrestrial observing. The

#887 includes an equatorial wedge for polar alignment. The tripod's 2"-diameter steel

legs collapse for easy transport in the field.

#880 Table Tripod (for ETX-90AT) and #881 Table Tripod (for ETX-105AT and the

ETX-125AT): For fully automatic tracking, a table tripod may be added allowing for

polar alignment of the telescope. See Fig. 41.

Each table tripod includes two fixed legs and two variable-length legs inscribed with a

range of latitude settings for quick polar alignment. At observing latitudes below about

25°, the optional

#1422 Low-Latitude Balance Weight is recommended for ETX-90

Astro Telescope models; the low-latitude balance weight is included with the table

tripod for the ETX-105AT and the ETX-125AT Astro Telescopes.

Fig. 37: The #932 45°

Erecting Prism.

Fig. 38: #774 Hard

Carrying Case shown with

an ETX-90AT.

Fig. 39: The #765 Soft

Carry Bag for the

ETX-90AT.

Fig. 40: #1244 Electric

Focuser.

Fig. 41: The #880 Table

Tripod.

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Meade ETX-90AT Manual

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