Mounting
Slot
Track
Thumb- screws
Fig. 11: Viewfinder Assembly.
Collimation Viewfinder
ScrewsEyepiece
GPS
Receiver
Fig. 12: Viewfinder collimation screws and eyepiece.
Tip:
Because the space between the GPS receiver and the viewfinder is a bit tight, it is helpful if you tighten the front, bottom viewfinder collimation thumbscrew first and use the other screws to set the alignment. However, if you determine you need to adjust the front thumb- screw, choose an alignment object that allows you to slightly elevate or rotate the telescope to a convenient position for adjustment of this thumbscrew.
Fig. 13a & 13b: Jupiter; examples of the right amount of magnification and too much magnification.
The power, or magnification of a telescope is determined by the focal length of the tel- escope and the focal length of the eyepiece being used (an eyepiece's focal length is printed on the side of the eyepiece). To calculate eyepiece power, divide the tele- scope's focal length by the eyepiece's focal lengthFor. example: A 26mm eyepiece is supplied with LX200GPS models. The focal length of the 8" f/10 LX200GPS is 2000mm (see SPECIFICATIONS, pages 47 through 49).
Eyepiece Power = Telescope focal length ÷ Eyepiece focal length Eyepiece Power = 2000mm ÷ 26mm
Eyepiece Power = 77
The eyepiece power, or magnification is therefore 77X (approximately).
Note: For a list of magnification ratings of the eyepieces available for the LX200GPS telescopes, see OPTIONAL ACCESSORIES, page 41.
Mounting and Adjusting the Viewfinder
To align the viewfinder, perform steps 1 through 5 during the daytime; perform step 6 at night.
1.Slide the track on the bottom of the viewfinder into the slot in the viewfinder mounting assembly. See Fig. 11. To secure the viewfinder to the mounting assembly, tighten the two thumbscrews (Fig. 11) to a firm feel only.
2.If you have not already done so, insert the Super Plössl 26mm eyepiece into the diagonal prism.
3.Unlock the R.A. (12, Fig. 1) and Dec. (17, Fig. 1) locks so that the telescope moves freely on both axes.
4.Point the telescope at some
5.Look through the viewfinder eyepiece (Fig. 12) and loosen or tighten, as appro- priate, one or more of the viewfinder collimation screws (Fig. 12) until the viewfinder crosshairs are precisely centered on the object you previously cen- tered in the telescope eyepiece.
6.Check this alignment on a celestial object, such as the Moon or a bright star, and make any necessary refinements, using the method outlined in steps 3 through 5.
Note: Seeing conditions vary widely from
LX200GPS TIPS
Too Much Power?
Can you ever have too much power? If the type of power you’re referring to is eyepiece magnification, yes, you can! The most common mistake of the begin- ning observer is to “overpower” a telescope by using high magnifications which the telescope’s aperture and atmospheric conditions cannot reasonably support. Keep in mind that a smaller, but bright and
Autostar II can calculate the best eyepiece for you to use. Try out the “Eyepiece Calc” feature in the Utilities menu.
Most observers should have three or four additional eyepieces to achieve the full range of reasonable magnifications possible with the LX200GPS telescopes. See OPTIONAL ACCESSORIES, page 41.
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