iOptron 8504, 8503, 8502, 8500 Using your telescope, Selecting an Eyepiece, Focusing Telescope

time zone). Enter minutes “ahead of” or “behind” UT (universal time). The minimum time difference is 60 minutes.

•New York City is 300 minutes “behind”

UT

•Los Angeles is 480 minutes “behind” UT

•Rome is 60 minutes “ahead of” UT

•Beijing is 480 minutes “ahead of” UT

•Sydney is 600 minutes “ahead of” UT

All the time zones in North America are behind UT, as shown in the following table. So make sure it shows “behind” instead of “ahead of” UT.

Time Zone	Hours	Enter
	behind UT	Minutes
Hawaii	-10	600
Alaska	-9	540
Pacific	-8	480
Mountain	-7	420
Central	-6	360
Eastern	-5	300

To adjust minutes, use the ◄ or ► key to move the cursor, and the ▲ or ▼ button to change the numbers. To change the “behind” or “ahead of” UT, move the cursor to “ahead of” and using ▲ or ▼ key to toggle between “behind” and “ahead of”. When the number is correct, press ENTER and go back to the previous screen.

For other parts of the world, you can find out your “time zone” information from internet,

suchas http://www.timeanddate.com/worldclock/.

DO NOT COUNT DAYLIGHT SAVING TIME.

If a GPS module is connected to the E- mount, the local time, longitude and latitude information will be received from satellites

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after the link is established. Only Daylight Time Saving and Time Zone settings are needed. However, the local time and site info also can be manually entered in case of GPS malfunction or testing the mount inside. It is always a good idea to do your home work to get the GPS coordinates before traveling to a new observation site.

A clear sky outside is needed for GPS to communicate well with the satellites.

4.2.2. Using your telescope

Selecting an Eyepiece:

1.Always begin viewing with the lowest power eyepiece. (Note: a 25 mm focal length eyepiece has a lower power than a

10mm one.) A formula can be used to determine the power of each eyepiece: Telescope focal length divided by eyepiece focal length equals magnification. Ex. 400mm ÷ 25mm = 16X (magnification)

2.A 45° Erecting Diagonal Prism is included in the R80 or MC90 telescope. The Erecting Diagonal Prism is used to erect the image you will see. Astronomical telescopes are designed in such a way that the image you see may be UPSIDE DOWN and REVERSED. This is perfect for viewing celestial bodies. However, it will feel strange when observing a land object or a bird.

Focusing Telescope:

1.After selecting the desired eyepiece aim the telescope tube at a land-based target at least 200 yards away (e.g. A telephone pole or building). Fully extend focusing tube by turning the focus knob.

2.While looking through selected eyepiece, slowly retract focusing tube by turning focusing knob until object comes into focus.

Aligning Finderscope:

1.Look through Main Telescope Tube and establish a well-defined target (see focusing