tag:blogger.com,1999:blog-654754338632526091.post2245343844424805376..comments2023-05-24T07:00:00.561-07:00Comments on Photos and Stuff: Notes on Lens Compressionamolitorhttp://www.blogger.com/profile/15743439184763617516noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-654754338632526091.post-59939416668076756442020-06-06T11:03:21.087-07:002020-06-06T11:03:21.087-07:00You can just say "you" not "the aut...You can just say "you" not "the author", it's just me here.amolitorhttps://www.blogger.com/profile/15743439184763617516noreply@blogger.comtag:blogger.com,1999:blog-654754338632526091.post-85915144719409042132020-06-06T10:42:25.149-07:002020-06-06T10:42:25.149-07:00The author has confused linear perspective with le...The author has confused linear perspective with lens compression, also known as apparent perspective. He is absolutely correct that the relationship of size between two objects is proportional to the distance from the camera. Unfortunately, this does not explain lens compression. <br /><br />Lens compression is a perceptual property of an image. It is an effect related to viewing distance and the angular difference between the viewer and the camera system. When the relationship between the angular view of the viewer to the displayed image is the same as the angular view of the camera system is the same, the apparent perspective is considered normal.This is why a normal lens and standard viewing distance are both defined as the same as the diagonal of the image area. When the angular view is greater in the camera system then in the viewing conditions, then the apparent perspective increases, meaning the sense of space increases. When the angular view is less in the camera system than in the the viewing conditions, then the apparent perspective is less, this is usually described as compression. The two usual states are usually obvious with image made by wide-angle and telephoto lenses.<br /><br />But as the author clearly demonstrate, the viewing distance creates the effect of compress. When two images are displayed with identical angular dimensions for both the taking and viewing distances, the apparent perspective is equal. The confusion comes by trying to use linear relationships in linear perspective to disprove an perceptual property defined by angular relationships. This is well documented in photo science as well as the mathematics in geometric projection. Unfortunately, this rarely makes it outside these disciplines.Anonymousnoreply@blogger.com