Here's a calculator to easily figure out the focal length of 35mm lenses when attached to digital SLRs (focal length changes due to Field of View crop.
Help, my PC with Windows 10 won't shut down properly
Since upgrading to Windows 10 my computer won't shut down properly. I use the menu button shutdown and the screen goes blank, but the system does not fully shut down. The only way to get it to shut down is to hold the physical power button down till it shuts down. Any suggestions?