If you have installed Windows 8 on an virtual machines, you can easily get a screen capture of the logon screen. But in case you are normally booting or dual booting, then there is no direct option. Windows 8 Login Screen Capture is a freeware and portable app which allows you to quickly capture the screenshot of the Windows 8 login screen. Just click on the button to install the tool.
Once installed, log off Windows and then open the login screen. Click on the Ease of Access Button on the left bottom side of the login screen. This will initiate the login screen capture option.
You can click on the Snap Login Screen button and capture the screen shot.
You can uninstall the app any time if you want to do so.
Download Windows 8 Login Screen Capture
is there any software to capture photo when booting starts.