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<p>[QUOTE="desertgem, post: 1886808, member: 15199"]I agree that a cheap lens won't ruin your eyes, but it also usually not give your the best images. Any quality lens should have a focal length long enough that the magnification factor is accurate for the resolution. The focal length indicates how close you have to hold the object from the lens for correct focus. A 10X lens with a focal length of 3/4" may seem fine if you only use it occasionally, but it will soon be uncomfortable to get enough light around your fingers , whereas a 10X lens with a focal length of 1.25 in. seems like no problem to examine coins. Of course longer focal length lens have a more expensive type of high refraction glass with coated material to reduce false color, etc. </p><p><br /></p><p>Also take into consideration the diameter of the glass, the wider, the better~ but some imports are wide , but the lack the fore mentioned attributes. For the price, Belomo optics are top grade for under $50 and come in various configuration. Amazon and others carry the product. It is built like military goods , because it once was.</p><p><br /></p><p><a href="http://www.amazon.com/s/?ie=UTF8&keywords=belomo+loupe+10x&tag=googhydr-20&index=aps&hvadid=6690539847&hvpos=1t1&hvexid=&hvnetw=g&hvrand=2196017945623149053&hvpone=&hvptwo=&hvqmt=b&hvdev=c&ref=pd_sl_46az6p258a_b" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.amazon.com/s/?ie=UTF8&keywords=belomo+loupe+10x&tag=googhydr-20&index=aps&hvadid=6690539847&hvpos=1t1&hvexid=&hvnetw=g&hvrand=2196017945623149053&hvpone=&hvptwo=&hvqmt=b&hvdev=c&ref=pd_sl_46az6p258a_b" rel="nofollow">http://www.amazon.com/s/?ie=UTF8&keywords=belomo+loupe+10x&tag=googhydr-20&index=aps&hvadid=6690539847&hvpos=1t1&hvexid=&hvnetw=g&hvrand=2196017945623149053&hvpone=&hvptwo=&hvqmt=b&hvdev=c&ref=pd_sl_46az6p258a_b</a></p><p><br /></p><p>Like others, I have accumulated several types along the way ( I prefer a stereoscopic inspection microscope at home) and my long focal length 10X, textile thread counter, which I bought from Edmunds 30+ years ago and never let out of my hands. I carry a 'China' $2 magnifier to lend out to club members or some one standing next to me in a show <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>
[QUOTE="desertgem, post: 1886808, member: 15199"]I agree that a cheap lens won't ruin your eyes, but it also usually not give your the best images. Any quality lens should have a focal length long enough that the magnification factor is accurate for the resolution. The focal length indicates how close you have to hold the object from the lens for correct focus. A 10X lens with a focal length of 3/4" may seem fine if you only use it occasionally, but it will soon be uncomfortable to get enough light around your fingers , whereas a 10X lens with a focal length of 1.25 in. seems like no problem to examine coins. Of course longer focal length lens have a more expensive type of high refraction glass with coated material to reduce false color, etc. Also take into consideration the diameter of the glass, the wider, the better~ but some imports are wide , but the lack the fore mentioned attributes. For the price, Belomo optics are top grade for under $50 and come in various configuration. Amazon and others carry the product. It is built like military goods , because it once was. [url]http://www.amazon.com/s/?ie=UTF8&keywords=belomo+loupe+10x&tag=googhydr-20&index=aps&hvadid=6690539847&hvpos=1t1&hvexid=&hvnetw=g&hvrand=2196017945623149053&hvpone=&hvptwo=&hvqmt=b&hvdev=c&ref=pd_sl_46az6p258a_b[/url] Like others, I have accumulated several types along the way ( I prefer a stereoscopic inspection microscope at home) and my long focal length 10X, textile thread counter, which I bought from Edmunds 30+ years ago and never let out of my hands. I carry a 'China' $2 magnifier to lend out to club members or some one standing next to me in a show :)[/QUOTE]
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