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<p>[QUOTE="bruthajoe, post: 3951473, member: 108656"][)</p><p><br /></p><p>As [USER=112]@GDJMSP[/USER] says, a small difference in the light position can have a profound difference on the resulting image. This can be used to advantage. As I have shown elsewhere, I use a setup with the camera mounted on a microscope stand, with axial lighting at the 10:00 and 2:00 positions above the coin. I use a third light, much lower, to cast some light horizontally across the coin to reduce shadows.</p><p><br /></p><p>The entire camera setup sits on a small turntable, while the lights are stationary on the desktop. My current technique is to rotate the turntable about 10 degrees between each shot, taking 9 photos. Since the coin and camera rotate as a unit, these are all perfectly aligned with each other. I straighten, crop, and merge into a .GIF file with .15 second between each frame.</p><p><br /></p><p>This can show some things well, but there are tradeoffs. A .GIF file is big and has compromises. To put together 9 frames, a size of 800x1600 pixels is about as big as you can go and still stay under CoinTalk’s file size limit of 10MB. Each frame can only have 256 colors. As a result you may get adjacent pixels resolving to the same color, losing some accuracy in the color fidelity. So, given the size and color limitations these are not the best for detailed surface examination. If I want to show that, I generate a single still image of 1920x1920, which is again CoinTalk’s maximum image.</p><p><br /></p><p><br /></p><p><br /></p><p>[ATTACH=full]1040638[/ATTACH]</p><p><br /></p><p>Here you can see that the light is not kicked directly back up into the lens, but that the camera captures the light illuminating the surface (a subtle distinction when I put it into words, but you can see the difference quite readily in the images).</p><p><br /></p><p>Again there are tradeoffs. The images, I personally feel, try to bring in that dynamic play of light that still photos have trouble with. Sometimes they really help when trying to see small shapes, such as whether a Standing Liberty Quarter has enough features to merit a Full Head designation. And sometimes you have to fall back to a well-lighted still photo to get the higher resolution and better color fidelity.[/QUOTE]</p><p>...Great information here. Thank you. Can you share your preferred light source.. 60 Watt incandescent? Halogen? Here is an honest representation of the same Franklin. Remember this is only different type of light source... The first Franklin was taken with a light diffuser. Basically any opaque material between the source of light and the coin.</p><p><br /></p><p>I actually had not thought of that, I can absolutely get the same effect with either class of coin and I am seeing sellers take advantage of this type of image. Unfortunately I have already posted an honest picture of this coin in this thread somewhere. Edit.. well I thought I did.[/QUOTE]</p><p><br /></p>
[QUOTE="bruthajoe, post: 3951473, member: 108656"][) As [USER=112]@GDJMSP[/USER] says, a small difference in the light position can have a profound difference on the resulting image. This can be used to advantage. As I have shown elsewhere, I use a setup with the camera mounted on a microscope stand, with axial lighting at the 10:00 and 2:00 positions above the coin. I use a third light, much lower, to cast some light horizontally across the coin to reduce shadows. The entire camera setup sits on a small turntable, while the lights are stationary on the desktop. My current technique is to rotate the turntable about 10 degrees between each shot, taking 9 photos. Since the coin and camera rotate as a unit, these are all perfectly aligned with each other. I straighten, crop, and merge into a .GIF file with .15 second between each frame. This can show some things well, but there are tradeoffs. A .GIF file is big and has compromises. To put together 9 frames, a size of 800x1600 pixels is about as big as you can go and still stay under CoinTalk’s file size limit of 10MB. Each frame can only have 256 colors. As a result you may get adjacent pixels resolving to the same color, losing some accuracy in the color fidelity. So, given the size and color limitations these are not the best for detailed surface examination. If I want to show that, I generate a single still image of 1920x1920, which is again CoinTalk’s maximum image. [ATTACH=full]1040638[/ATTACH] Here you can see that the light is not kicked directly back up into the lens, but that the camera captures the light illuminating the surface (a subtle distinction when I put it into words, but you can see the difference quite readily in the images). Again there are tradeoffs. The images, I personally feel, try to bring in that dynamic play of light that still photos have trouble with. Sometimes they really help when trying to see small shapes, such as whether a Standing Liberty Quarter has enough features to merit a Full Head designation. And sometimes you have to fall back to a well-lighted still photo to get the higher resolution and better color fidelity.[/QUOTE] ...Great information here. Thank you. Can you share your preferred light source.. 60 Watt incandescent? Halogen? Here is an honest representation of the same Franklin. Remember this is only different type of light source... The first Franklin was taken with a light diffuser. Basically any opaque material between the source of light and the coin. I actually had not thought of that, I can absolutely get the same effect with either class of coin and I am seeing sellers take advantage of this type of image. Unfortunately I have already posted an honest picture of this coin in this thread somewhere. Edit.. well I thought I did.[/QUOTE]
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