When going to an eclipse, you need to be sure all your equipment is battery powered for self-sufficiency. The telescope is polar aligned and then aimed at the sun. The tracking motor automatically follows the sun and keeps it in the center of the field of view. It is not advisable to use a telescope and video system mounted on a tripod. So, any telescope or telephoto combination that either has too large or too small a field of view would not be very usable.
Wind is another factor that can vibrate the telescope.
Care must be taken to protect the equipment from wind and wind-borne particles at the site. During the eclipse process, the moon slowly begins to cover the sun. This is the first sign of a Baily's Bead. One or more may slowly develop or recede as long as 20 minutes before or after central eclipse. The real action happens within several minutes before 2nd contact when one or more beads begin are clearly visible.