To record pin point stars in long exposures, you need to zero in on the exact location of the north or south celestial pole. Each chart has a field of view of 5 degrees, about the same as most finderscopes.
Step 1: Ensure that the finderscope's cross hairs aim at the same spot in the sky as your main telescope.
Step 2: Place the mount so that its polar axisaims roughly at the celestial pole.
Step 3: Swing the tube so that it is aimed at 90 degrees declination according to the declination setting circle.
Step 4: By moving the whole mount, now aim the finderscope at the pole location shown on the chart. Take care not to move the mount in declination or right ascension. Use the star patterns as a guide—while peering through the finder with one eye, watch Alkaid or Crux with the other eye to work out which way to offset the telescope.
Trouble-shooting: This method can go awry if your declination setting circle does not read a true 90 degrees. To calibrate it, set the telescope at 90 degrees, then-rotate the telescope back and forth in right ascension, (east-west). If the telescope is set accurately, the stars will appear to revolve around the center of the eyepiece field. If they do not move the telescope slightly in declination and try again. Once you have the stars revolving around the center, loosen the declination circle and turn it until it reads 90 degrees. Then lock it down. You should not need to adjust it again. Now return to Step 4.