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<p>[QUOTE=&quot;benveniste, post: 25498427, member: 25547&quot;]Some quick answers, since any of the three questions you ask can become internet rabbit holes.</p><p><br /></p><p>1.&nbsp; The best light source is one which can illuminate your coin evenly.&nbsp; If you can&#039;t get the light &quot;on target&quot; not much else matters.&nbsp; You also want a source which produces different wavelengths of light evenly across the visible spectrum rather than just producing a lot of light at some wavelengths and very little at others.&nbsp; Sunlight and incandescent bulbs do this naturally, but LEDs and fluorescents can only simulate that output.&nbsp; The quality of this simulation can be measured by a statistic called CRI -- in general, the higher the CRI the better the source is for visible light photography.&nbsp; With a modern digital camera, color temperature is less important as long as your camera is set appropriately.</p><p><br /></p><p>2.&nbsp; Magnification ratios measure the size of the image recorded on film divided by the size of a flat cross section of the object.&nbsp; For a coin, that&#039;s typically the coin&#039;s diameter.&nbsp; So, for example, if a coin is 48mm in diameter and you use a so-called &quot;full frame&quot; camera like a Sony A7 to &quot;fill the frame&quot; vertically, the reproduction ratio would be 1:2.&nbsp; If both the coin and the image size is 24mm, the reproduction ratio would be 1:1.&nbsp; Many lens and camera combinations do not allow focusing that closely, so you may need a special purpose (&quot;macro&quot;) lens or accessories to accomplish what you want.</p><p><br /></p><p>3.&nbsp; Image ratios are also called aspect ratios and measure the shape of the recorded image.&nbsp; So if a camera&#039;s sensor is 36mm wide and 24mm tall, the image ratio is 3:2.&nbsp; If it&#039;s 17.3mm wide and 13mm tall, it&#039;s 4:3.[/QUOTE]</p><p><br /></p>

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