The coarse adjustment knob is the first device for focusing. With the scanner objective (4X) in place, this knob is used to determine a sharp focus. All other objectives should be in "near focus" when rotated into position and will only need the fine adjustment for a sharp image.
NEWTON is an electronic community for Science, Math, and Computer Science K-12 Educators, sponsored and operated by Argonne National Laboratory's Educational Programs, Andrew Skipor, Ph.D., Head of Educational Programs.
