Provided is a digital camera which can display an image quickly following a change in a position of an object with a small-sized, inexpensive construction at the time of picking up the image of the object in a low brightness. The properties of silicon carbide make this wide band gap semiconductor a promising material for high power devices. The invention also relates to compounds and compositions, such as \u03b23 adrenoceptor agonists, useful in the treatment of mammals, particularly humans, having a condition characterised by abnormalities of myocardial cell ion levels, such as Na+, K+ and Ca2+ ions, including heart failure and myocardial hypertrophy.