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<p>[QUOTE=&quot;rmpsrpms, post: 2662510, member: 31773&quot;]A problem with newer dedicated macro lenses is that they change in focal length as magnification is increased toward 1:1. Generally the focal length at 1:1 is about 60-70% of the focal length at infinity. So a 105mm lens becomes a 65 or 70mm lens at 1:1, while an 85mm lens becomes a 55 or 60mm. This reduces the working distance, and given the large diameter of the lens, makes lighting more difficult. </p><p><br /></p><p>The first macro lens I purchased for photographing coins was a 105mm AFS Micro-Nikkor, and I quickly found it unsuitable due to difficulty in lighting. I still have the lens, and occasionally use it for walkabout macro of flowers and bugs, but it was the shortcomings of the 105mm AFS lens that led me down the path of bellows and enlarging/duplicating lenses. </p><p><br /></p><p>If you do decide to go down the dedicated macro lens path, I would highly recommend you get a long lens such as 150mm or 180mm. This guarantees you have good working distance and lighting flexibility. The drawback to longer lenses is they need very long working distances for bigger coins, so you will need a tall copy stand or tripod to frame Dollars.[/QUOTE]</p><p><br /></p>

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