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Message: <blockquote data-quote="WayneF" data-source="post: 442601" data-attributes="member: 12496">It's really not this hard.  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />    For 1:1, it does not matter what the sensor size is (however we do have to know digital sensor size to be able to measure the image size).   For 1:1, it only matters that the image of the subject object on the sensor is the same size as the object... 1:1 is real life size.  The sensor can be any size larger than the object image, we don't care.   If we had a 3 inch sensor, and both the image size and the subject size were 5 mm, then that is 1:1, real life size.The easiest way (knowing the sensor size) is to determine how much of a ruler will fit within that known sensor size.</blockquote>