In optics, particularly as it relates to film and photography, depth of field is the distance between the nearest and farthest objects in a scene that appear acceptably sharp in an image. Although a lens can precisely focus at only one distance at a time, the decrease in sharpness is gradual on each side of the focused distance, so that within the DOF, the unsharpness is imperceptible under normal viewing conditions.
Like most entry-level DSLRs the EOS 450D provides a number of auto shooting modes aimed at beginners, including portrait, landscape, close-up, sports and night portrait and flash off choices. All of these functions performed adequately in all aspects, apart from the close-up macro mode that did not come near to offering a true 1:1 reproduction. There are, of course, manual and semi-automatic modes for users who want more advanced exposure control. Canon refers to these advanced operations as the 'creative zone' and provides all the normal settings including Program, Aperture and Shutter Priority and the full manual mode. Additionally, they provide the Automatic Depth of Field function that gives a wider depth of field between a near and far subject.
Like most entry-level DSLRs the EOS 450D provides a number of auto shooting modes aimed at beginners, including portrait, landscape, close-up, sports and night portrait and flash off choices. All of these functions performed adequately in all aspects, apart from the close-up macro mode that did not come near to offering a true 1:1 reproduction. There are, of course, manual and semi-automatic modes for users who want more advanced exposure control. Canon refers to these advanced operations as the 'creative zone' and provides all the normal settings including Program, Aperture and Shutter Priority and the full manual mode. Additionally, they provide the Automatic Depth of Field function that gives a wider depth of field between a near and far subject.