I have had these lenses for a few months now and they are starting to lose their sharpness. I'll see if my husband can sharpen them but it might not be worth the trouble. At first they are very sharp, I was really impressed, but I have a small cut flower farm, so I keep cutting flowers of different sizes and they gradually lose their effectiveness. It's what you pay for the situation, but I didn't want to invest much initially. I love that the pens come in different colors so I can easily find the ones I'm looking for. Large selection of stems of different sizes and stiffness.
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