Meade LX90-ACF 10 inch User Manual - Page 15

15 Aligning the Viewfinder The viewfinder helps you locate objects and must also be aligned to the main telescope. 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 bracket into the slot in the viewfinder mounting assembly. See Fig. 6a. To secure the viewfinder to the mounting assembly, tighten the two thumbscrews (Fig. 6a) 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. (Pg. 7, Fig. 1, 9) and Dec. (Pg. 7, Fig. 1, 7) locks so that the telescope moves freely on both axes. 4. Point the telescope at some well-defined and stationary land object at least 200 yards distant, such as the top of a telephone pole or street sign. Center the object in the telescope eyepiece. Re-tighten the R.A. and Dec. locks. 5. Look through the viewfinder eyepiece (Pg. 7, Fig. 6b) and loosen or tighten, as appropriate, one or more of the viewfinder alignment screws (Pg. 7, Fig. 6b) until the viewfinder crosshairs are precisely centered on the object you previously centered 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 and 4. Mounting Slot Alignment Screws Track Thumbscrews Viewfinder Eyepiece Fig. 6a: Viewfinder Assembly. Fig. 6b: Viewfinder Assembly.