Sight and compensating mechanism thereof

A compensating mechanism, comprising:

• a base unit;
• a displaying unit disposed on the base unit and comprising a mark and an annular body;
• an adjusting cap disposed outside the displaying unit and comprising an information displaying portion for showing the mark;
• a first transmission unit connected to the adjusting cap and the displaying unit;
• wherein the adjusting cap is not linearly movable but rotatable with respect to the base unit;
• wherein the adjusting cap is manually rotated with respect to the base unit about an axis, the information displaying portion is synchronously rotated with the adjusting cap and the first transmission unit drives the displaying unit to linearly move along the axis so as to change the mark shown by the information displaying portion;
• wherein the annular body comprises inner threads;
• wherein the mark comprises a plurality of parallel scale lines, and a distance between two adjacent scale lines is equal to a lead of the inner threads.

A compensating mechanism, comprising:

• a base unit;
• a displaying unit disposed on the base unit and comprising a mark and an annular body disposed around the base unit, the mark being disposed on an outer surface of the annular body;
• an adjusting cap disposed outside the displaying unit and comprising an information displaying portion for showing the mark;
• a first transmission unit connected to the adjusting cap and the displaying unit;
• wherein the adjusting cap is not linearly movable but rotatable with respect to the base unit;
• wherein the adjusting cap is manually rotated with respect to the base unit about an axis, the information displaying portion is synchronously rotated with the adjusting cap and the first transmission unit drives the displaying unit to linearly move along the axis so as to change the mark shown by the information displaying portion;
• wherein the annular body comprises inner threads, and the base unit comprises outer threads mating with the inner threads;
• and
• wherein the mark comprises a plurality of parallel scale lines, and a distance between two adjacent scale lines is equal to a lead of the inner threads.