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<p>[QUOTE="dougsmit, post: 3323704, member: 19463"]I don't expect anyone to listen but when you add extension tubes to a zoom, the zoom ring provides better focus control than the focus ring. It is a technical thing involving the fact that most modern lenses have internal focusing rather than just moving the lens further from the film plane. </p><p><br /></p><p>Dedicated macro lenses often outperform zooms a lot in the corners of the image but less so in the middle. Round coins do not use the corners so some of the improvement is lost. That is why I suggest people try what they have before they buy expensive lenses that may help little. </p><p><br /></p><p>Diffraction starts about f/9 with crop dSLR's and f/11 with full frames. When it becomes objectionable depends on standards which also explains why so many people like the results from phones. Making nothing larger than 2x3" photos will allow a lot of diffraction; 20x30" prints are more a problem. It really does depend on what you find objectionable. Things like camera motion and failure to focus on the coin rather than the background ruin ten times as many photos as diffraction or lens quality. A $2000 lens on a spindly tripod is easy to outshoot with a phone on a drinking glass. </p><p><br /></p><p>I really recommend a wireless remote release if your camera model accepts one. They are ridiculously cheap from China on eBay. There are many brands/sellers and I have experience with only one that no longer sells on eBay so I can not help. My original Digital Rebel (300D) and 5DmkII use the same one but my 30D does not so you have to do a little research depending on what you have. I do not study all camera models (that is another hobby). You can pay 20x the price and get one from your local camera store that works no better. </p><p><br /></p><p>I would REALLY like to see coin photos taken with the 75-300 on a solid stand and using tubes. The lens does not have a great reputation but used at f/11 and with everything else right, I suspect it may be better than some other choices and the long focal length will allow a lot of room for lights to be arranged as you like.[/QUOTE]</p><p><br /></p>
[QUOTE="dougsmit, post: 3323704, member: 19463"]I don't expect anyone to listen but when you add extension tubes to a zoom, the zoom ring provides better focus control than the focus ring. It is a technical thing involving the fact that most modern lenses have internal focusing rather than just moving the lens further from the film plane. Dedicated macro lenses often outperform zooms a lot in the corners of the image but less so in the middle. Round coins do not use the corners so some of the improvement is lost. That is why I suggest people try what they have before they buy expensive lenses that may help little. Diffraction starts about f/9 with crop dSLR's and f/11 with full frames. When it becomes objectionable depends on standards which also explains why so many people like the results from phones. Making nothing larger than 2x3" photos will allow a lot of diffraction; 20x30" prints are more a problem. It really does depend on what you find objectionable. Things like camera motion and failure to focus on the coin rather than the background ruin ten times as many photos as diffraction or lens quality. A $2000 lens on a spindly tripod is easy to outshoot with a phone on a drinking glass. I really recommend a wireless remote release if your camera model accepts one. They are ridiculously cheap from China on eBay. There are many brands/sellers and I have experience with only one that no longer sells on eBay so I can not help. My original Digital Rebel (300D) and 5DmkII use the same one but my 30D does not so you have to do a little research depending on what you have. I do not study all camera models (that is another hobby). You can pay 20x the price and get one from your local camera store that works no better. I would REALLY like to see coin photos taken with the 75-300 on a solid stand and using tubes. The lens does not have a great reputation but used at f/11 and with everything else right, I suspect it may be better than some other choices and the long focal length will allow a lot of room for lights to be arranged as you like.[/QUOTE]
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Thinking of new camera for coin pictures
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