FIG. 3: The Secondary Mirror System (Looking down the optical tube toward the primary mirror)
1. Bolt holding single-strut vane (right)
2. Bolt holding single-strut vane (left)
3. Bolt-fastening secondary mirror holder
4. Secondary mirror
5. Single-strut vane
6. Main optical tube
FIG. 4: Out-of-Focus Star Image
Fig. 2 shows a correctly collimated DS-10 telescope, as it appears when viewed through the focuser with the
eyepiece removed. To check and, if necessary, set the optical collimation follow these steps:
Step 1: Observe through the focuser, without an eyepiece, and with your body oriented so that the telescope's
primary mirror is to your left, and the open-end of the telescope tube is to your right. The secondary mirror
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