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<blockquote data-quote="WayneF" data-source="post: 639312" data-attributes="member: 12496">Not sure I understand about the hood, but the main problem with a very close focus distance is that the lens may block the light on the subject.&nbsp; A lens hood would greatly aggravate that.And the crop body does not change anything (except cropped field of view). This is true of both macro and the general case.Saying, camera on a tripod and focused for 1:1. Switch out the bodies, and it is still at 1:1.&nbsp; This is true at 30 feet also, still focused at 30 feet. The lens is not affected by the sensor crop.&nbsp; Full frame shows a larger frame and field, cropped frame shows a smaller frame and field, but the image inside the frame depends only on what the lens can do. Appearance of sensor cropping looks the same as if cropping later in the computer.&nbsp; Cropping only changes frame size, but not the contained image.&nbsp; Cropping in the computer loses that many pixels, but smaller cropped sensors can be built with more pixels to make up for that aspect.&nbsp;1:1 magnification is entirely about the lens.&nbsp;&nbsp; 1:1 is the same 1:1 regardless of sensor crop.&nbsp; 1:1 is about magnification, i.e., object size.&nbsp; Cropped &quot;equivalent focal length&quot; is instead about field of view, it crops the object (instead of magnifying it). Equivalent focal length is simply to maintain the same field size.In every case (macro or not), sensor crop only crops the total field of view size size, but does not affect the object size projected by the lens.&nbsp; In every case, the object image size is whatever the lens can do. Saying, sensor crop does not affect whatever the lens can do, it merely crops that image (due to the smaller sensor).</blockquote>

[QUOTE="WayneF, post: 639312, member: 12496"] Not sure I understand about the hood, but the main problem with a very close focus distance is that the lens may block the light on the subject. A lens hood would greatly aggravate that. And the crop body does not change anything (except cropped field of view). This is true of both macro and the general case. Saying, camera on a tripod and focused for 1:1. Switch out the bodies, and it is still at 1:1. This is true at 30 feet also, still focused at 30 feet. The lens is not affected by the sensor crop. Full frame shows a larger frame and field, cropped frame shows a smaller frame and field, but the image inside the frame depends only on what the lens can do. Appearance of sensor cropping looks the same as if cropping later in the computer. Cropping only changes frame size, but not the contained image. Cropping in the computer loses that many pixels, but smaller cropped sensors can be built with more pixels to make up for that aspect. 1:1 magnification is entirely about the lens. 1:1 is the same 1:1 regardless of sensor crop. 1:1 is about magnification, i.e., object size. Cropped "equivalent focal length" is instead about field of view, it crops the object (instead of magnifying it). Equivalent focal length is simply to maintain the same field size. In every case (macro or not), sensor crop only crops the total field of view size size, but does not affect the object size projected by the lens. In every case, the object image size is whatever the lens can do. Saying, sensor crop does not affect whatever the lens can do, it merely crops that image (due to the smaller sensor). [/QUOTE]

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