User talk:180.190.91.107

September 2015
Hello, I'm Stephenb. I wanted to let you know that I undid one or more of your recent contributions to Objective (optics) because it did not appear constructive. If you would like to experiment, please use the sandbox. If you think I made a mistake, or if you have any questions, you can leave me a message on my talk page. Thanks. Stephenb (Talk) 09:21, 10 September 2015 (UTC)
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