Definition. A tumor is an abnormal growth caused by the uncontrolled division of cells. Benign tumors do not have the potential to spread to other parts of the body (a process called metastasis) and are curable by surgical removal.
Fine Focus: This is the knob used to fine tune the focus on the specimen. It is also used to focus on various parts of the specimen. Generally one uses the coarse focus first to get close then moves to the fine focus knob for fine tuning. Field of View: Sometimes abbreviated FOV, it is the diameter of the circle of light that you see when looking into a microscope.
art_haykin. Sharpness usually refers to the image quality produced by a good lens in true focus, while grain is a property of the negative. A neg can be grainy and still be sharp, that is, in focus. Aug 24, 2002.