Most SCT owners do not dare or want to collimate their telescope. Collimation often is a drastic way of improving performance of a telescope. SCT's are extremely sensitive to collimation. Collimation can be achieved and destroyed with the slightest movement of the collimation screw.
Most users stop when the shadow of the secondary mirror is centered in the disk of starlight.
This step is necessary, but is only the start of the collimation process. Due to a lack of information most owners do not know how to properly collimate their telescope. To achieve optimal performance, you do not need to be an optician and have a complicated laboratory. How There are two ways of collimating an SCT that are widely used and well known. You can collimate your telescope by using the star test or you can collimate the telescope by using a laser collimator.