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<blockquote data-quote="Bob Blaylock" data-source="post: 339585" data-attributes="member: 16749">I would take a 1:1 ratio to mean that the lens is positioned so that the image formed on the film/sensor behind it is the same size as the subject in front of it.&nbsp; To look at it a bit differently, the area of the subject covered by the image would be the same size as the frame of the film or sensor.&nbsp; An 8×10 view camera configured to take a 1:1 macro shot would cover an area eight inches by ten inches.&nbsp; A 35mm film camera configured for a 1:1 macro shot would cover an area 26 millimeters by 24 millimeters.&nbsp; My DX-format D3200 would cover an area 23.2 by 15.4 millimeters.&nbsp; If you could get one lens, that would work with all three of these cameras, and was configured for a 1:1 macro shot, then it would truly be a 1:1 macro shot regardless of the size of the frame.&nbsp; The size of the frame has no bearing on this ratio.&nbsp; What the size of the frame does affect, given a particular ratio, is how much of the subject in front of the camera is covered in the picture.&nbsp; Again, with a 1:1 ratio, the area of subject covered in front of the camera would be the same size as the frame on which the image is focused.&nbsp; But really, this ratio isn't nearly as meaningful as it seems.&nbsp; You're rarely going to print or display any picture at the size of the film frame or image sensor used to record it.</blockquote>

[QUOTE="Bob Blaylock, post: 339585, member: 16749"] I would take a 1:1 ratio to mean that the lens is positioned so that the image formed on the film/sensor behind it is the same size as the subject in front of it. To look at it a bit differently, the area of the subject covered by the image would be the same size as the frame of the film or sensor. An 8×10 view camera configured to take a 1:1 macro shot would cover an area eight inches by ten inches. A 35mm film camera configured for a 1:1 macro shot would cover an area 26 millimeters by 24 millimeters. My DX-format D3200 would cover an area 23.2 by 15.4 millimeters. If you could get one lens, that would work with all three of these cameras, and was configured for a 1:1 macro shot, then it would truly be a 1:1 macro shot regardless of the size of the frame. The size of the frame has no bearing on this ratio. What the size of the frame does affect, given a particular ratio, is how much of the subject in front of the camera is covered in the picture. Again, with a 1:1 ratio, the area of subject covered in front of the camera would be the same size as the frame on which the image is focused. But really, this ratio isn't nearly as meaningful as it seems. You're rarely going to print or display any picture at the size of the film frame or image sensor used to record it. [/QUOTE]

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