Meade ETX-90EC instruction manual OPTIONALz Accessories, #1244 and #1247 Electric Focusers

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OPTIONALz ACCESSORIES

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Fig.30: The #932 45° Erecting Prism shown threaded to the rear cell of an ETX-90EC. (1) #932 45° Erecting Prism;

(2) Eyepiece; (3) Knurled lock-ring; (4) Flip-mirror control.

Important Note: In the most discriminating applications, such as long-distance observing of delicate bird feather-structure, both ETX models’ internal, optically-flat mirror yields a higher- resolution image than is possible with any prism, including the #932. In these special cases users of both ETX models are advised to observe with the eyepiece in the standard 90° eyepiece holder (as shown in Fig.1), with the flip-mirror control in the “up” position. This admonition applies only to situations requiring extraordinarily high optical resolution and where the observer’s eye is well trained to observe very fine detail. In typical terrestrial applications, no image differences between the two eyepiece locations can generally be noted.

#765 Soft Carry Bag: The Meade soft-padded carry bag (Fig.

31)is well suited to travel with the ETX-90EC. Each carry bag includes a shoulder strap and permits ready transport of the complete telescope, including accessories.

Fig.31: The #765 Soft Carry Bag for the ETX-90EC.

Power Adapters and Cords: In addition to their internal battery packs, ETX-90ECand ETX-125EC 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, either telescope may be powered in the field from an automobile cigarette lighter plug by using the #607 Power Cord (Fig. 32), a 25-ft. cord that plugs into the telescope’s control panel and supplies 12vDC directly from the car battery.

Fig.32: #607 Power Cord.

#1244 and #1247 Electric

Focusers:

Meade-engineered for smooth, rapid focusing with both ETX models, each electric focuser (Fig. 33) includes coarse and micro- fine speeds. The standard- equipment hand controller accepts one (user-supplied) 9-volt battery. On both ETX models, the focuser plugs into, and is powered by, the telescope’s control panel, with operation effected through either the Electronic Controller or the optional #497 Autostar Computer Controller: the #1244 for ETX-90EC and the #1247 for ETX-125EC.

Fig.33: #1244 Electric

Focuser.

Hard Carrying Cases : For secure portability of the ETX-90EC (#774 Hard Case) or ETX-125EC (#775 Hard Case) in the field, Meade hard carrying cases (Fig. 34) are fully lined with fitted foam inserts. They accept the complete telescope and accessories (e.g., additional eyepieces, table tripod, the Electronic Controller, Autostar, and much more).

Fig.34: #775 Hard Carrying Case shown with an ETX-90EC.

#905 Variable Polarizing Filter: For glare reduction in observing the Moon, the #905 Variable Polarizer (Fig. 35) includes two polarizer filters, mounted in a specially machined cell. The #905 filter permits variable settings of light transmission, between 5% and 25%, to account for varying lunar-surface

brightness according to the Fig.35: #905 Variable phase of the Moon. The #905 Polarizing Filter. accepts 1.25” barrel-diameter

eyepieces of any focal length.