Can someone rewrite this in their own words please. Open Depth of field is controlled by changing the aperture setting on your camera. Like your eye, a camera lens has an iris inside that can open or close to let in more or less light.
A shallow depth of field is the small or narrow area in an image that is in focus. Often, the background is blurred while only the subject stays in focus.

The open depth of field can be compared to an eye. Your eye contains an iris that either expands or contracts when exposed to certain amounts of light. It can be referred to as the aperture settings on your camera. A shallow depth of field is when a focus point of your picture is very clear, while other parts, such as the background, are blurred.

expository writing is one of the most common types of writing.

the development of trade during the middle age increased to the change given in the agriculture, which gave money, industry and markets a bigger importance in economy. the agriculture production was more than the consumption, which meant the creation of wider markets out of the areas. besides, with the end of multiple wars, the population increased and new trade routes were created.