What are the characteristics and advantages of TSC (Thermally Stable Composite)?

TSC is a type of polycarbonate with a thermal expansion rate similar to that of aluminum. If materials with different thermal expansion rates are used in combination, naturally, the change in magnitude when temperature changes will differ. In consideration of this, clearance is required. This clearance can be minimized if the differences in thermal expansion rates are small.
By using a combination of TSC and aluminum parts which share similar thermal expansion rates, it is possible to manufacture a highly accurate lens barrel with a minimum deviation.